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2020-12-03Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski1-0/+2
Conflicts: drivers/net/ethernet/ibm/ibmvnic.c Signed-off-by: Jakub Kicinski <[email protected]>
2020-12-03scripts: kernel-doc: fix parsing function-like typedefsMauro Carvalho Chehab1-1/+1
Changeset 6b80975c6308 ("scripts: kernel-doc: fix typedef parsing") added support for things like: typedef unsigned long foo(); However, it caused a regression on this prototype: typedef bool v4l2_check_dv_timings_fnc(const struct v4l2_dv_timings *t, void *handle); This is only noticed after adding a patch that checks if the kernel-doc identifier matches the typedef: ./scripts/kernel-doc -none $(git grep '^.. kernel-doc::' Documentation/ |cut -d ' ' -f 3|sort|uniq) 2>&1|grep expecting include/media/v4l2-dv-timings.h:38: warning: expecting prototype for typedef v4l2_check_dv_timings_fnc. Prototype was for typedef nc instead The problem is that, with the new parsing logic, it is not checking for complete words at the type part. Fix it by adding a \b at the end of each type word at the regex. fixes: 6b80975c6308 ("scripts: kernel-doc: fix typedef parsing") Signed-off-by: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/218ff56dcb8e73755005d3fb64586eb1841a276b.1606896997.git.mchehab+huawei@kernel.org Signed-off-by: Jonathan Corbet <[email protected]>
2020-12-03scripts: get_feat.pl: use its implementation for list-arch.shMauro Carvalho Chehab1-13/+64
Add support for the same output format as the bash script, and use its implementation instead of the previous one. I opted to do such patch in order to have a single script responsible for parsing Documentation/features and produce different outputs. As someone may rely on the past format, which is easy to parse it, get_feat.pl now gains a new command with the same output format as the previous script. As a side effect, the perl script is a lot faster, as it reads each file only once, instead of parsing files several times via a for command and grep commands inside it. This patch also changes the features list order to be case-insensitive, in order to better match the output of the existing script. Signed-off-by: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/a97f49677805ad4e6b982d02c0db8c9dfbbd20a6.1606748711.git.mchehab+huawei@kernel.org Signed-off-by: Jonathan Corbet <[email protected]>
2020-12-03scripts: get_feat.pl: improve matrix outputMauro Carvalho Chehab1-43/+70
Instead of producing a too wide table, let's split it per subsystem, and use a better notation in order to make easier for the reader to identify how a feature is supported on multiple architectures. Signed-off-by: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/9c3e8c813e8146c5c30e10fa75974f8fbfe6016a.1606748711.git.mchehab+huawei@kernel.org Signed-off-by: Jonathan Corbet <[email protected]>
2020-12-03scripts: get_feat.pl: add a script to handle Documentation/featuresMauro Carvalho Chehab1-0/+474
The Documentation/features contains a set of parseable files. It is not worth converting them to ReST format, as they're useful the way it is. It is, however, interesting to parse them and produce output on different formats: 1) Output the contents of a feature in ReST format; 2) Output what features a given architecture supports; 3) Output a matrix with features x architectures. Signed-off-by: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/8b0c1ad06d689283a6d78c4ccd188a02c3acc0de.1606748711.git.mchehab+huawei@kernel.org Signed-off-by: Jonathan Corbet <[email protected]>
2020-12-01kbuild: Disable CONFIG_LD_ORPHAN_WARN for ld.lld 10.0.1Nathan Chancellor1-0/+20
ld.lld 10.0.1 spews a bunch of various warnings about .rela sections, along with a few others. Newer versions of ld.lld do not have these warnings. As a result, do not add '--orphan-handling=warn' to LDFLAGS_vmlinux if ld.lld's version is not new enough. Link: https://github.com/ClangBuiltLinux/linux/issues/1187 Link: https://github.com/ClangBuiltLinux/linux/issues/1193 Reported-by: Arvind Sankar <[email protected]> Reported-by: kernelci.org bot <[email protected]> Reported-by: Mark Brown <[email protected]> Reviewed-by: Kees Cook <[email protected]> Signed-off-by: Nathan Chancellor <[email protected]> Reviewed-by: Nick Desaulniers <[email protected]> Signed-off-by: Masahiro Yamada <[email protected]>
2020-11-28Merge tag 'kbuild-fixes-v5.10' of ↵Linus Torvalds1-0/+2
git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild Pull Kbuild fixes from Masahiro Yamada: - Remove unused OBJSIZE variable. - Fix rootless deb-pkg build in a setgid directory. * tag 'kbuild-fixes-v5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: builddeb: Fix rootless build in setuid/setgid directory kbuild: remove unused OBJSIZE
2020-11-26bpf: Add a BPF helper for getting the IMA hash of an inodeKP Singh1-0/+2
Provide a wrapper function to get the IMA hash of an inode. This helper is useful in fingerprinting files (e.g executables on execution) and using these fingerprints in detections like an executable unlinking itself. Since the ima_inode_hash can sleep, it's only allowed for sleepable LSM hooks. Signed-off-by: KP Singh <[email protected]> Signed-off-by: Daniel Borkmann <[email protected]> Acked-by: Yonghong Song <[email protected]> Link: https://lore.kernel.org/bpf/[email protected]
2020-11-25kbuild: Skip module BTF generation for out-of-tree external modulesAndrii Nakryiko1-2/+7
In some modes of operation, Kbuild allows to build modules without having vmlinux image around. In such case, generation of module BTF is impossible. This patch changes the behavior to emit a warning about impossibility of generating kernel module BTF, instead of breaking the build. This is especially important for out-of-tree external module builds. In vmlinux-less mode: $ make clean $ make modules_prepare $ touch drivers/acpi/button.c $ make M=drivers/acpi ... CC [M] drivers/acpi/button.o MODPOST drivers/acpi/Module.symvers LD [M] drivers/acpi/button.ko BTF [M] drivers/acpi/button.ko Skipping BTF generation for drivers/acpi/button.ko due to unavailability of vmlinux ... $ readelf -S ~/linux-build/default/drivers/acpi/button.ko | grep BTF -A1 ... empty ... Now with normal build: $ make all ... LD [M] drivers/acpi/button.ko BTF [M] drivers/acpi/button.ko ... $ readelf -S ~/linux-build/default/drivers/acpi/button.ko | grep BTF -A1 [60] .BTF PROGBITS 0000000000000000 00029310 000000000000ab3f 0000000000000000 0 0 1 Fixes: 5f9ae91f7c0d ("kbuild: Build kernel module BTFs if BTF is enabled and pahole supports it") Reported-by: Bruce Allan <[email protected]> Signed-off-by: Andrii Nakryiko <[email protected]> Signed-off-by: Daniel Borkmann <[email protected]> Cc: Jessica Yu <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> Cc: Masahiro Yamada <[email protected]> Link: https://lore.kernel.org/bpf/[email protected]
2020-11-25Makefile.extrawarn: move -Wcast-align to W=3Arnd Bergmann1-1/+1
This warning behaves differently depending on the architecture and compiler. Using x86 gcc, we get no output at all because gcc knows the architecture can handle unaligned accesses. Using x86 clang, or gcc on an architecture that needs to manually deal with unaligned accesses, the build log is completely flooded with these warnings, as they are commonly invoked by inline functions of networking headers, e.g. include/linux/skbuff.h:1426:26: warning: cast increases required alignment of target type [-Wcast-align] The compiler is correct to point this out, as we are dealing with undefined behavior that does cause problems in practice, but there is also no good way to rewrite the code in commonly included headers to a safer method. Signed-off-by: Arnd Bergmann <[email protected]> Reviewed-by: Nathan Chancellor <[email protected]> Signed-off-by: Masahiro Yamada <[email protected]>
2020-11-20s390/ftrace: assume -mhotpatch or -mrecord-mcount always availableVasily Gorbik1-3/+0
Currently the kernel minimal compiler requirement is gcc 4.9 or clang 10.0.1. * gcc -mhotpatch option is supported since 4.8. * A combination of -pg -mrecord-mcount -mnop-mcount -mfentry flags is supported since gcc 9 and since clang 10. Drop support for old -pg function prologues. Which leaves binary compatible -mhotpatch / -mnop-mcount -mfentry prologues in a form: brcl 0,0 Which are also do not require initial nop optimization / conversion and presence of _mcount symbol. Signed-off-by: Vasily Gorbik <[email protected]> Reviewed-by: Heiko Carstens <[email protected]> Signed-off-by: Heiko Carstens <[email protected]>
2020-11-18bpf: Add bpf_bprm_opts_set helperKP Singh1-0/+2
The helper allows modification of certain bits on the linux_binprm struct starting with the secureexec bit which can be updated using the BPF_F_BPRM_SECUREEXEC flag. secureexec can be set by the LSM for privilege gaining executions to set the AT_SECURE auxv for glibc. When set, the dynamic linker disables the use of certain environment variables (like LD_PRELOAD). Signed-off-by: KP Singh <[email protected]> Signed-off-by: Daniel Borkmann <[email protected]> Acked-by: Martin KaFai Lau <[email protected]> Link: https://lore.kernel.org/bpf/[email protected]
2020-11-14Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-nextJakub Kicinski1-2/+18
Daniel Borkmann says: ==================== pull-request: bpf-next 2020-11-14 1) Add BTF generation for kernel modules and extend BTF infra in kernel e.g. support for split BTF loading and validation, from Andrii Nakryiko. 2) Support for pointers beyond pkt_end to recognize LLVM generated patterns on inlined branch conditions, from Alexei Starovoitov. 3) Implements bpf_local_storage for task_struct for BPF LSM, from KP Singh. 4) Enable FENTRY/FEXIT/RAW_TP tracing program to use the bpf_sk_storage infra, from Martin KaFai Lau. 5) Add XDP bulk APIs that introduce a defer/flush mechanism to optimize the XDP_REDIRECT path, from Lorenzo Bianconi. 6) Fix a potential (although rather theoretical) deadlock of hashtab in NMI context, from Song Liu. 7) Fixes for cross and out-of-tree build of bpftool and runqslower allowing build for different target archs on same source tree, from Jean-Philippe Brucker. 8) Fix error path in htab_map_alloc() triggered from syzbot, from Eric Dumazet. 9) Move functionality from test_tcpbpf_user into the test_progs framework so it can run in BPF CI, from Alexander Duyck. 10) Lift hashtab key_size limit to be larger than MAX_BPF_STACK, from Florian Lehner. Note that for the fix from Song we have seen a sparse report on context imbalance which requires changes in sparse itself for proper annotation detection where this is currently being discussed on linux-sparse among developers [0]. Once we have more clarification/guidance after their fix, Song will follow-up. [0] https://lore.kernel.org/linux-sparse/CAHk-=wh4bx8A8dHnX612MsDO13st6uzAz1mJ1PaHHVevJx_ZCw@mail.gmail.com/T/ https://lore.kernel.org/linux-sparse/[email protected]/T/ * git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next: (66 commits) net: mlx5: Add xdp tx return bulking support net: mvpp2: Add xdp tx return bulking support net: mvneta: Add xdp tx return bulking support net: page_pool: Add bulk support for ptr_ring net: xdp: Introduce bulking for xdp tx return path bpf: Expose bpf_d_path helper to sleepable LSM hooks bpf: Augment the set of sleepable LSM hooks bpf: selftest: Use bpf_sk_storage in FENTRY/FEXIT/RAW_TP bpf: Allow using bpf_sk_storage in FENTRY/FEXIT/RAW_TP bpf: Rename some functions in bpf_sk_storage bpf: Folding omem_charge() into sk_storage_charge() selftests/bpf: Add asm tests for pkt vs pkt_end comparison. selftests/bpf: Add skb_pkt_end test bpf: Support for pointers beyond pkt_end. tools/bpf: Always run the *-clean recipes tools/bpf: Add bootstrap/ to .gitignore bpf: Fix NULL dereference in bpf_task_storage tools/bpftool: Fix build slowdown tools/runqslower: Build bpftool using HOSTCC tools/runqslower: Enable out-of-tree build ... ==================== Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
2020-11-13scripts: kernel-doc: Restore anonymous enum parsingAndy Shevchenko1-1/+1
The commit d38c8cfb0571 ("scripts: kernel-doc: add support for typedef enum") broke anonymous enum parsing. Restore it by relying on members rather than its name. Fixes: d38c8cfb0571 ("scripts: kernel-doc: add support for typedef enum") Reported-by: kernel test robot <[email protected]> Signed-off-by: Andy Shevchenko <[email protected]> Reviewed-by: Mauro Carvalho Chehab <[email protected]> Cc: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jonathan Corbet <[email protected]>
2020-11-12Merge tag 'net-5.10-rc4' of ↵Linus Torvalds1-0/+1
git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net Pull networking fixes from Jakub Kicinski: "Current release - regressions: - arm64: dts: fsl-ls1028a-kontron-sl28: specify in-band mode for ENETC Current release - bugs in new features: - mptcp: provide rmem[0] limit offset to fix oops Previous release - regressions: - IPv6: Set SIT tunnel hard_header_len to zero to fix path MTU calculations - lan743x: correctly handle chips with internal PHY - bpf: Don't rely on GCC __attribute__((optimize)) to disable GCSE - mlx5e: Fix VXLAN port table synchronization after function reload Previous release - always broken: - bpf: Zero-fill re-used per-cpu map element - fix out-of-order UDP packets when forwarding with UDP GSO fraglists turned on: - fix UDP header access on Fast/frag0 UDP GRO - fix IP header access and skb lookup on Fast/frag0 UDP GRO - ethtool: netlink: add missing netdev_features_change() call - net: Update window_clamp if SOCK_RCVBUF is set - igc: Fix returning wrong statistics - ch_ktls: fix multiple leaks and corner cases in Chelsio TLS offload - tunnels: Fix off-by-one in lower MTU bounds for ICMP/ICMPv6 replies - r8169: disable hw csum for short packets on all chip versions - vrf: Fix fast path output packet handling with async Netfilter rules" * tag 'net-5.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (65 commits) lan743x: fix use of uninitialized variable net: udp: fix IP header access and skb lookup on Fast/frag0 UDP GRO net: udp: fix UDP header access on Fast/frag0 UDP GRO devlink: Avoid overwriting port attributes of registered port vrf: Fix fast path output packet handling with async Netfilter rules cosa: Add missing kfree in error path of cosa_write net: switch to the kernel.org patchwork instance ch_ktls: stop the txq if reaches threshold ch_ktls: tcb update fails sometimes ch_ktls/cxgb4: handle partial tag alone SKBs ch_ktls: don't free skb before sending FIN ch_ktls: packet handling prior to start marker ch_ktls: Correction in middle record handling ch_ktls: missing handling of header alone ch_ktls: Correction in trimmed_len calculation cxgb4/ch_ktls: creating skbs causes panic ch_ktls: Update cheksum information ch_ktls: Correction in finding correct length cxgb4/ch_ktls: decrypted bit is not enough net/x25: Fix null-ptr-deref in x25_connect ...
2020-11-10kbuild: Build kernel module BTFs if BTF is enabled and pahole supports itAndrii Nakryiko1-2/+18
Detect if pahole supports split BTF generation, and generate BTF for each selected kernel module, if it does. This is exposed to Makefiles and C code as CONFIG_DEBUG_INFO_BTF_MODULES flag. Kernel module BTF has to be re-generated if either vmlinux's BTF changes or module's .ko changes. To achieve that, I needed a helper similar to if_changed, but that would allow to filter out vmlinux from the list of updated dependencies for .ko building. I've put it next to the only place that uses and needs it, but it might be a better idea to just add it along the other if_changed variants into scripts/Kbuild.include. Each kernel module's BTF deduplication is pretty fast, as it does only incremental BTF deduplication on top of already deduplicated vmlinux BTF. To show the added build time, I've first ran make only just built kernel (to establish the baseline) and then forced only BTF re-generation, without regenerating .ko files. The build was performed with -j60 parallelization on 56-core machine. The final time also includes bzImage building, so it's not a pure BTF overhead. $ time make -j60 ... make -j60 27.65s user 10.96s system 782% cpu 4.933 total $ touch ~/linux-build/default/vmlinux && time make -j60 ... make -j60 123.69s user 27.85s system 1566% cpu 9.675 total So 4.6 seconds real time, with noticeable part spent in compressed vmlinux and bzImage building. To show size savings, I've built my kernel configuration with about 700 kernel modules with full BTF per each kernel module (without deduplicating against vmlinux) and with split BTF against deduplicated vmlinux (approach in this patch). Below are top 10 modules with biggest BTF sizes. And total size of BTF data across all kernel modules. It shows that split BTF "compresses" 115MB down to 5MB total. And the biggest kernel modules get a downsize from 500-570KB down to 200-300KB. FULL BTF ======== $ for f in $(find . -name '*.ko'); do size -A -d $f | grep BTF | awk '{print $2}'; done | awk '{ s += $1 } END { print s }' 115710691 $ for f in $(find . -name '*.ko'); do printf "%s %d\n" $f $(size -A -d $f | grep BTF | awk '{print $2}'); done | sort -nr -k2 | head -n10 ./drivers/gpu/drm/i915/i915.ko 570570 ./drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.ko 520240 ./drivers/gpu/drm/radeon/radeon.ko 503849 ./drivers/infiniband/hw/mlx5/mlx5_ib.ko 491777 ./fs/xfs/xfs.ko 411544 ./drivers/net/ethernet/intel/i40e/i40e.ko 403904 ./drivers/net/ethernet/broadcom/bnx2x/bnx2x.ko 398754 ./drivers/infiniband/core/ib_core.ko 397224 ./fs/cifs/cifs.ko 386249 ./fs/nfsd/nfsd.ko 379738 SPLIT BTF ========= $ for f in $(find . -name '*.ko'); do size -A -d $f | grep BTF | awk '{print $2}'; done | awk '{ s += $1 } END { print s }' 5194047 $ for f in $(find . -name '*.ko'); do printf "%s %d\n" $f $(size -A -d $f | grep BTF | awk '{print $2}'); done | sort -nr -k2 | head -n10 ./drivers/gpu/drm/i915/i915.ko 293206 ./drivers/gpu/drm/radeon/radeon.ko 282103 ./fs/xfs/xfs.ko 222150 ./drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.ko 198503 ./drivers/infiniband/hw/mlx5/mlx5_ib.ko 198356 ./drivers/net/ethernet/broadcom/bnx2x/bnx2x.ko 113444 ./fs/cifs/cifs.ko 109379 ./arch/x86/kvm/kvm.ko 100225 ./drivers/gpu/drm/drm.ko 94827 ./drivers/infiniband/core/ib_core.ko 91188 Signed-off-by: Andrii Nakryiko <[email protected]> Signed-off-by: Alexei Starovoitov <[email protected]> Link: https://lore.kernel.org/bpf/[email protected]
2020-11-09remove boolinit.cocciPeter Zijlstra1-195/+0
0/1 for booleans is perfectly valid C. Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Signed-off-by: Julia Lawall <[email protected]>
2020-11-08Merge tag 'driver-core-5.10-rc3' of ↵Linus Torvalds1-0/+23
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core Pull driver core documentation fixes from Greg KH: "Some small Documentation fixes that were fallout from the larger documentation update we did in 5.10-rc2. Nothing major here at all, but all of these have been in linux-next and resolve build warnings when building the documentation files" * tag 'driver-core-5.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: Documentation: remove mic/index from misc-devices/index.rst scripts: get_api.pl: Add sub-titles to ABI output scripts: get_abi.pl: Don't let ABI files to create subtitles docs: leds: index.rst: add a missing file docs: ABI: sysfs-class-net: fix a typo docs: ABI: sysfs-driver-dma-ioatdma: what starts with /sys
2020-11-07locking/atomics: Regenerate the atomics-check SHA1'sIngo Molnar1-0/+0
The include/asm-generic/atomic-instrumented.h checksum got out of sync, so regenerate it. (No change to actual code.) Also make scripts/atomic/gen-atomics.sh executable, to make it easier to use. The auto-generated atomic header signatures are now fine: thule:~/tip> scripts/atomic/check-atomics.sh thule:~/tip> Signed-off-by: Ingo Molnar <[email protected]> Cc: [email protected] Cc: Peter Zijlstra <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Paul E. McKenney <[email protected]> Cc: Will Deacon <[email protected]> Signed-off-by: Ingo Molnar <[email protected]>
2020-11-07Merge branch 'linus' into perf/kprobesIngo Molnar69-1405/+3011
Conflicts: include/asm-generic/atomic-instrumented.h kernel/kprobes.c Use the upstream atomic-instrumented.h checksum, and pick the kprobes version of kernel/kprobes.c, which effectively reverts this upstream workaround: 645f224e7ba2: ("kprobes: Tell lockdep about kprobe nesting") Since the new code *should* be fine without nesting. Knock on wood ... Signed-off-by: Ingo Molnar <[email protected]>
2020-11-07Merge branch 'linus' into perf/kprobesIngo Molnar1-2/+6
Merge recent kprobes updates into perf/kprobes that came from -mm. Signed-off-by: Ingo Molnar <[email protected]>
2020-11-06Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpfJakub Kicinski1-0/+1
Alexei Starovoitov says: ==================== pull-request: bpf 2020-11-06 1) Pre-allocated per-cpu hashmap needs to zero-fill reused element, from David. 2) Tighten bpf_lsm function check, from KP. 3) Fix bpftool attaching to flow dissector, from Lorenz. 4) Use -fno-gcse for the whole kernel/bpf/core.c instead of function attribute, from Ard. * git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf: bpf: Update verification logic for LSM programs bpf: Zero-fill re-used per-cpu map element bpf: BPF_PRELOAD depends on BPF_SYSCALL tools/bpftool: Fix attaching flow dissector libbpf: Fix possible use after free in xsk_socket__delete libbpf: Fix null dereference in xsk_socket__delete libbpf, hashmap: Fix undefined behavior in hash_bits bpf: Don't rely on GCC __attribute__((optimize)) to disable GCSE tools, bpftool: Remove two unused variables. tools, bpftool: Avoid array index warnings. xsk: Fix possible memory leak at socket close bpf: Add struct bpf_redir_neigh forward declaration to BPF helper defs samples/bpf: Set rlimit for memlock to infinity in all samples bpf: Fix -Wshadow warnings selftest/bpf: Fix profiler test using CO-RE relocation for enums ==================== Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
2020-11-03Merge tag 'docs-5.10-warnings' of git://git.lwn.net/linuxLinus Torvalds1-1/+5
Pull documentation build warning fixes from Jonathan Corbet: "This contains a series of warning fixes from Mauro; once applied, the number of warnings from the once-noisy docs build process is nearly zero. Getting to this point has required a lot of work; once there, hopefully we can keep things that way. I have packaged this as a separate pull because it does a fair amount of reaching outside of Documentation/. The changes are all in comments and in code placement. It's all been in linux-next since last week" * tag 'docs-5.10-warnings' of git://git.lwn.net/linux: (24 commits) docs: SafeSetID: fix a warning amdgpu: fix a few kernel-doc markup issues selftests: kselftest_harness.h: fix kernel-doc markups drm: amdgpu_dm: fix a typo gpu: docs: amdgpu.rst: get rid of wrong kernel-doc markups drm: amdgpu: kernel-doc: update some adev parameters docs: fs: api-summary.rst: get rid of kernel-doc include IB/srpt: docs: add a description for cq_size member locking/refcount: move kernel-doc markups to the proper place docs: lockdep-design: fix some warning issues MAINTAINERS: fix broken doc refs due to yaml conversion ice: docs fix a devlink info that broke a table crypto: sun8x-ce*: update entries to its documentation net: phy: remove kernel-doc duplication mm: pagemap.h: fix two kernel-doc markups blk-mq: docs: add kernel-doc description for a new struct member docs: userspace-api: add iommu.rst to the index file docs: hwmon: mp2975.rst: address some html build warnings docs: net: statistics.rst: remove a duplicated kernel-doc docs: kasan.rst: add two missing blank lines ...
2020-11-03Merge tag 'docs-5.10-3' of git://git.lwn.net/linuxLinus Torvalds1-5/+10
Pull documentation fixes from Jonathan Corbet: "A small number of fixes, plus a build tweak to respect the desire for silence in V=0 builds" * tag 'docs-5.10-3' of git://git.lwn.net/linux: docs: fix automarkup regression on Python 2 documentation: arm: sunxi: add Allwinner H6 documents scripts: kernel-doc: split typedef complex regex scripts: kernel-doc: fix typedef parsing docs: Makefile: honor V=0 for docs building
2020-11-02scripts: get_api.pl: Add sub-titles to ABI outputMauro Carvalho Chehab1-0/+17
Instead of adding titles just for the files, add titles for each part of the ABI output, in order to make easier to search for a symbol there. Signed-off-by: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/64752a5de06ab8263c296e3ed01414b25861e1eb.1604312590.git.mchehab+huawei@kernel.org Signed-off-by: Greg Kroah-Hartman <[email protected]>
2020-11-02scripts: get_abi.pl: Don't let ABI files to create subtitlesMauro Carvalho Chehab1-0/+6
The ReST output should only contain documentation titles automatically created by the script. There are two reasons for that: 1) Consistency. just a handful ABI docs define titles 2) To avoid critical errors. Docutils (which is the basis for Sphinx) allows a free assign of documentation title markups. So, one document could be doing things like: Level 1 ======= Level 2 ------- While another one could do the reverse: Level 1 ------- Level 2 ======= But the same document can't mix. As the output of get_abi.pl will join contents from multiple files, if they don't define the levels on a consistent errors, errors like this can happen: Sphinx parallel build error: docutils.utils.SystemMessage: /home/rdunlap/lnx/lnx-510-rc2/Documentation/ABI/testing/sysfs-bus-rapidio:2: (SEVERE/4) Title level inconsistent: Attributes Common for All RapidIO Devices ----------------------------------------- Which cause some versions of Sphinx to go into an endless loop. It should be noticed that an alternative to that would be to replace all title occurrences by a single markup, but that will make the parser more complex, and, due to (1) it would generate an inconsistent output. So, better to just remove the titles defined at the ABI files from the output. Reported-by: Randy Dunlap <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/6c62ef5c01d39dee8d891f8390c816d2a889670a.1604312590.git.mchehab+huawei@kernel.org Signed-off-by: Greg Kroah-Hartman <[email protected]>
2020-11-02builddeb: Fix rootless build in setuid/setgid directorySven Joachim1-0/+2
Building 5.10-rc1 in a setgid directory failed with the following error: dpkg-deb: error: control directory has bad permissions 2755 (must be >=0755 and <=0775) When building with fakeroot, the earlier chown call would have removed the setgid bits, but in a rootless build they remain. Fixes: 3e8541803624 ("builddeb: Enable rootless builds") Cc: Guillem Jover <[email protected]> Signed-off-by: Sven Joachim <[email protected]> Signed-off-by: Masahiro Yamada <[email protected]>
2020-10-30scripts: get_abi.pl: assume ReST format by defaultMauro Carvalho Chehab1-1/+1
All ABI files are now compatible with ReST format. So, change the script default to assume that the ABI source files are compatible with ReST. Acked-by: Jonathan Corbet <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/4b0af257010570e0e917d82498e42992bec5e173.1604042072.git.mchehab+huawei@kernel.org Signed-off-by: Greg Kroah-Hartman <[email protected]>
2020-10-30docs: ABI: cleanup several ABI documentsMauro Carvalho Chehab1-2/+0
There are some ABI documents that, while they don't generate any warnings, they have issues when parsed by get_abi.pl script on its output result. Address them, in order to provide a clean output. Reviewed-by: Tom Rix <[email protected]> # for fpga-manager Reviewed-By: Kajol Jain<[email protected]> # for sysfs-bus-event_source-devices-hv_gpci and sysfs-bus-event_source-devices-hv_24x7 Acked-by: Jonathan Cameron <[email protected]> #for IIO Acked-by: Oded Gabbay <[email protected]> # for Habanalabs Acked-by: Vaibhav Jain <[email protected]> # for sysfs-bus-papr-pmem Acked-by: Cezary Rojewski <[email protected]> # for catpt Acked-by: Suzuki K Poulose <[email protected]> Acked-by: Ilya Dryomov <[email protected]> # for rbd Acked-by: Jonathan Corbet <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/5bc78e5b68ed1e9e39135173857cb2e753be868f.1604042072.git.mchehab+huawei@kernel.org Signed-off-by: Greg Kroah-Hartman <[email protected]>
2020-10-30docs: Kconfig/Makefile: add a check for broken ABI filesMauro Carvalho Chehab1-3/+11
The files under Documentation/ABI should follow the syntax as defined at Documentation/ABI/README. Allow checking if they're following the syntax by running the ABI parser script on COMPILE_TEST. With that, when there's a problem with a file under Documentation/ABI, it would produce a warning like: Warning: file ./Documentation/ABI/testing/sysfs-bus-pci-devices-aer_stats#14: What '/sys/bus/pci/devices/<dev>/aer_stats/aer_rootport_total_err_cor' doesn't have a description Warning: file ./Documentation/ABI/testing/sysfs-bus-pci-devices-aer_stats#21: What '/sys/bus/pci/devices/<dev>/aer_stats/aer_rootport_total_err_fatal' doesn't have a description Acked-by: Jonathan Corbet <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/57a38de85cb4b548857207cf1fc1bf1ee08613c9.1604042072.git.mchehab+huawei@kernel.org Signed-off-by: Greg Kroah-Hartman <[email protected]>
2020-10-30scripts: get_abi.pl: auto-generate cross referencesMauro Carvalho Chehab1-0/+31
There are several cross-references that can be automatically generated: - References to .rst files inside Documentation/ - References to other ABI files; - References to ABI symbols at /sys/*. Add a logic to automatically parse them and convert into cross references. Acked-by: Jonathan Corbet <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/abe756d4f94fb6ffcc3dd3902a766c7c3990ea89.1604042072.git.mchehab+huawei@kernel.org Signed-off-by: Greg Kroah-Hartman <[email protected]>
2020-10-30scripts: get_abi.pl: use bold font for ABI definitionsMauro Carvalho Chehab1-0/+1
As we're using tables, let's distinguish the ones used by ABI by using a bold font. Acked-by: Jonathan Corbet <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/9ed645c2519169817379c1df5b8cf03828e92520.1604042072.git.mchehab+huawei@kernel.org Signed-off-by: Greg Kroah-Hartman <[email protected]>
2020-10-30scripts: get_abi.pl: prevent duplicated file namesMauro Carvalho Chehab1-5/+10
The same filename may exist on multiple directories within ABI. Create separate entries at the internal database for each of them. Acked-by: Jonathan Corbet <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/ef760f68f54e132c4be52f0027189b4ba31554ec.1604042072.git.mchehab+huawei@kernel.org Signed-off-by: Greg Kroah-Hartman <[email protected]>
2020-10-30scripts: get_abi.pl: output users in ReST formatMauro Carvalho Chehab1-0/+8
Right now, the script only outputs Users on search. Print it also in ReST format. Acked-by: Jonathan Corbet <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/83def2a692c4c678f21ee6e76b66a54d2be1e796.1604042072.git.mchehab+huawei@kernel.org Signed-off-by: Greg Kroah-Hartman <[email protected]>
2020-10-30scripts: get_abi.pl: detect duplicated ABI definitionsMauro Carvalho Chehab1-27/+58
The ABI should define only once each What. The current script logic assumes that. However, that's not the case, currently: there are several symbols with a generic definition, and per-driver ones. Better handle such cases, by preserving the cross-references with the files that define them, but also track such cases, producing warnings, as they should be fixed. Acked-by: Jonathan Corbet <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/d7a73b8b3aae5b2bff9279996ff9ca4cdfc89196.1604042072.git.mchehab+huawei@kernel.org Signed-off-by: Greg Kroah-Hartman <[email protected]>
2020-10-30scripts: get_abi.pl: cleanup ABI cross-reference logicMauro Carvalho Chehab1-64/+83
Right now, the cross-references are generated on a single step, when doing ReST output. While this is nice optimization, it prevents auto-creating cross-references for ABI symbols. So, split it into a separate logic. While here, turn on Perl warnings, as it helps to debug problems inside the script. Acked-by: Jonathan Corbet <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/dbc97c8c2dfd877921f058134c35b2a8b1f8414b.1604042072.git.mchehab+huawei@kernel.org Signed-off-by: Greg Kroah-Hartman <[email protected]>
2020-10-30scripts: get_abi.pl: improve its parser to better catch up indentationMauro Carvalho Chehab1-23/+19
The original parser for indentation were relying on having just one description for each "what". However, that's not the case: there are a number of ABI symbols that got defined multiple times. Improve the parser for it to better handle descriptions if entries are duplicated. Acked-by: Jonathan Corbet <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/eb458bb30be0e5a89192d6057b2e8a7e910dbcb8.1604042072.git.mchehab+huawei@kernel.org Signed-off-by: Greg Kroah-Hartman <[email protected]>
2020-10-30scripts: get_abi.pl: Allow optionally record from where a line came fromMauro Carvalho Chehab1-1/+21
The get_abi.pl reads a lot of files and can join them on a single output file. Store where each "What:" output came from, in order to be able to optionally display it. This is useful for the Sphinx extension, with can now be able to blame what ABI file has issues, and on what line the What: description with problems begin. Acked-by: Jonathan Corbet <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/befc387011c5e3c6febd285b7f27610e41c90260.1604042072.git.mchehab+huawei@kernel.org Signed-off-by: Greg Kroah-Hartman <[email protected]>
2020-10-30scripts: get_abi.pl: fix parsing on ReST modeMauro Carvalho Chehab1-16/+14
When the source ABI file is using ReST notation, the script should handle whitespaces and lines with care, as otherwise the file won't be properly recognized. Address the bugs that are on such part of the script. Acked-by: Jonathan Corbet <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/5c22c54fbd0cda797b691d52c568be6d0d1079d8.1604042072.git.mchehab+huawei@kernel.org Signed-off-by: Greg Kroah-Hartman <[email protected]>
2020-10-30scripts: get_abi.pl: change script to allow parsing in ReST modeMauro Carvalho Chehab1-25/+47
Right now, several ABI files won't parse as ReST, as they contain severe violations to the spec, with makes the script to crash. So, the code has a sanity logic with escapes bad code and cleans tags that can cause Sphinx to crash. Add support for disabling this mode. Right now, as enabling rst-mode causes crash, it is disabled by default. Acked-by: Jonathan Corbet <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/34b691e3002e8987c24d851fe37640f95e506a92.1604042072.git.mchehab+huawei@kernel.org Signed-off-by: Greg Kroah-Hartman <[email protected]>
2020-10-29bpf: Add struct bpf_redir_neigh forward declaration to BPF helper defsAndrii Nakryiko1-0/+1
Forward-declare struct bpf_redir_neigh in bpf_helper_defs.h to avoid compiler warning about unknown structs. Fixes: ba452c9e996d ("bpf: Fix bpf_redirect_neigh helper api to support supplying nexthop") Signed-off-by: Andrii Nakryiko <[email protected]> Signed-off-by: Daniel Borkmann <[email protected]> Acked-by: Toke Høiland-Jørgensen <[email protected]> Link: https://lore.kernel.org/bpf/[email protected]
2020-10-28scripts: kernel-doc: use :c:union when neededMauro Carvalho Chehab1-1/+5
Sphinx C domain code after 3.2.1 will start complaning if :c:struct would be used for an union type: .../Documentation/gpu/drm-kms-helpers:352: ../drivers/video/hdmi.c:851: WARNING: C 'identifier' cross-reference uses wrong tag: reference name is 'union hdmi_infoframe' but found name is 'struct hdmi_infoframe'. Full reference name is 'union hdmi_infoframe'. Full found name is 'struct hdmi_infoframe'. So, let's address this issue too in advance, in order to avoid future issues. Signed-off-by: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/6e4ec3eec914df62389a299797a3880ae4490f35.1603791716.git.mchehab+huawei@kernel.org Signed-off-by: Jonathan Corbet <[email protected]>
2020-10-28scripts: kernel-doc: split typedef complex regexMauro Carvalho Chehab1-5/+9
The typedef regex for function prototypes are very complex. Split them into 3 separate regex and then join them using qr. Signed-off-by: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/3a4af999a0d62d4ab9dfae1cdefdfcad93383356.1603792384.git.mchehab+huawei@kernel.org Signed-off-by: Jonathan Corbet <[email protected]>
2020-10-28scripts: kernel-doc: fix typedef parsingMauro Carvalho Chehab1-2/+3
The include/linux/genalloc.h file defined this typedef: typedef unsigned long (*genpool_algo_t)(unsigned long *map,unsigned long size,unsigned long start,unsigned int nr,void *data, struct gen_pool *pool, unsigned long start_addr); Because it has a type composite of two words (unsigned long), the parser gets the typedef name wrong: .. c:macro:: long **Typedef**: Allocation callback function type definition Fix the regex in order to accept composite types when defining a typedef for a function pointer. Signed-off-by: Mauro Carvalho Chehab <[email protected]> Link: https://lore.kernel.org/r/328e8018041cc44f7a1684e57f8d111230761c4f.1603792384.git.mchehab+huawei@kernel.org Signed-off-by: Jonathan Corbet <[email protected]>
2020-10-25treewide: Convert macro and uses of __section(foo) to __section("foo")Joe Perches1-2/+2
Use a more generic form for __section that requires quotes to avoid complications with clang and gcc differences. Remove the quote operator # from compiler_attributes.h __section macro. Convert all unquoted __section(foo) uses to quoted __section("foo"). Also convert __attribute__((section("foo"))) uses to __section("foo") even if the __attribute__ has multiple list entry forms. Conversion done using the script at: https://lore.kernel.org/lkml/[email protected]/2-convert_section.pl Signed-off-by: Joe Perches <[email protected]> Reviewed-by: Nick Desaulniers <[email protected]> Reviewed-by: Miguel Ojeda <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2020-10-25checkpatch: enable GIT_DIR environment use to set git repository locationJoe Perches1-5/+7
If set, use the environment variable GIT_DIR to change the default .git location of the kernel git tree. If GIT_DIR is unset, keep using the current ".git" default. Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Joe Perches <[email protected]> Tested-by: Geert Uytterhoeven <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2020-10-23Merge tag 'net-5.10-rc1' of ↵Linus Torvalds1-0/+1
git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net Pull networking fixes from Jakub Kicinski: "Cross-tree/merge window issues: - rtl8150: don't incorrectly assign random MAC addresses; fix late in the 5.9 cycle started depending on a return code from a function which changed with the 5.10 PR from the usb subsystem Current release regressions: - Revert "virtio-net: ethtool configurable RXCSUM", it was causing crashes at probe when control vq was not negotiated/available Previous release regressions: - ixgbe: fix probing of multi-port 10 Gigabit Intel NICs with an MDIO bus, only first device would be probed correctly - nexthop: Fix performance regression in nexthop deletion by effectively switching from recently added synchronize_rcu() to synchronize_rcu_expedited() - netsec: ignore 'phy-mode' device property on ACPI systems; the property is not populated correctly by the firmware, but firmware configures the PHY so just keep boot settings Previous releases - always broken: - tcp: fix to update snd_wl1 in bulk receiver fast path, addressing bulk transfers getting "stuck" - icmp: randomize the global rate limiter to prevent attackers from getting useful signal - r8169: fix operation under forced interrupt threading, make the driver always use hard irqs, even on RT, given the handler is light and only wants to schedule napi (and do so through a _irqoff() variant, preferably) - bpf: Enforce pointer id generation for all may-be-null register type to avoid pointers erroneously getting marked as null-checked - tipc: re-configure queue limit for broadcast link - net/sched: act_tunnel_key: fix OOB write in case of IPv6 ERSPAN tunnels - fix various issues in chelsio inline tls driver Misc: - bpf: improve just-added bpf_redirect_neigh() helper api to support supplying nexthop by the caller - in case BPF program has already done a lookup we can avoid doing another one - remove unnecessary break statements - make MCTCP not select IPV6, but rather depend on it" * tag 'net-5.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (62 commits) tcp: fix to update snd_wl1 in bulk receiver fast path net: Properly typecast int values to set sk_max_pacing_rate netfilter: nf_fwd_netdev: clear timestamp in forwarding path ibmvnic: save changed mac address to adapter->mac_addr selftests: mptcp: depends on built-in IPv6 Revert "virtio-net: ethtool configurable RXCSUM" rtnetlink: fix data overflow in rtnl_calcit() net: ethernet: mtk-star-emac: select REGMAP_MMIO net: hdlc_raw_eth: Clear the IFF_TX_SKB_SHARING flag after calling ether_setup net: hdlc: In hdlc_rcv, check to make sure dev is an HDLC device bpf, libbpf: Guard bpf inline asm from bpf_tail_call_static bpf, selftests: Extend test_tc_redirect to use modified bpf_redirect_neigh() bpf: Fix bpf_redirect_neigh helper api to support supplying nexthop mptcp: depends on IPV6 but not as a module sfc: move initialisation of efx->filter_sem to efx_init_struct() mpls: load mpls_gso after mpls_iptunnel net/sched: act_tunnel_key: fix OOB write in case of IPv6 ERSPAN tunnels net/sched: act_gate: Unlock ->tcfa_lock in tc_setup_flow_action() net: dsa: bcm_sf2: make const array static, makes object smaller mptcp: MPTCP_IPV6 should depend on IPV6 instead of selecting it ...
2020-10-22Merge tag 'kconfig-v5.10' of ↵Linus Torvalds2-275/+170
git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild Pull Kconfig updates from Masahiro Yamada: - Remove unused or useless code from qconf - Allow to edit "int", "hex", "string" options in place, and remove the separate edit box from qconf * tag 'kconfig-v5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: kconfig: qconf: create QApplication after option checks kconfig: qconf: remove Y, M, N columns kconfig: qconf: remove ConfigView class kconfig: qconf: move setShowName/Range() to ConfigList from ConfigView kconfig: qconf: remove ConfigLineEdit class kconfig: qconf: allow to edit "int", "hex", "string" menus in-place kconfig: qconf: show data column all the time kconfig: qconf: move ConfigView::updateList(All) to ConfigList class kconfig: qconf: remove unused ConfigItem::okRename() kconfig: qconf: update the intro message to match to the current code kconfig: qconf: reformat the intro message
2020-10-22Merge tag 'kbuild-v5.10' of ↵Linus Torvalds19-680/+401
git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild Pull Kbuild updates from Masahiro Yamada: - Support 'make compile_commands.json' to generate the compilation database more easily, avoiding stale entries - Support 'make clang-analyzer' and 'make clang-tidy' for static checks using clang-tidy - Preprocess scripts/modules.lds.S to allow CONFIG options in the module linker script - Drop cc-option tests from compiler flags supported by our minimal GCC/Clang versions - Use always 12-digits commit hash for CONFIG_LOCALVERSION_AUTO=y - Use sha1 build id for both BFD linker and LLD - Improve deb-pkg for reproducible builds and rootless builds - Remove stale, useless scripts/namespace.pl - Turn -Wreturn-type warning into error - Fix build error of deb-pkg when CONFIG_MODULES=n - Replace 'hostname' command with more portable 'uname -n' - Various Makefile cleanups * tag 'kbuild-v5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (34 commits) kbuild: Use uname for LINUX_COMPILE_HOST detection kbuild: Only add -fno-var-tracking-assignments for old GCC versions kbuild: remove leftover comment for filechk utility treewide: remove DISABLE_LTO kbuild: deb-pkg: clean up package name variables kbuild: deb-pkg: do not build linux-headers package if CONFIG_MODULES=n kbuild: enforce -Werror=return-type scripts: remove namespace.pl builddeb: Add support for all required debian/rules targets builddeb: Enable rootless builds builddeb: Pass -n to gzip for reproducible packages kbuild: split the build log of kallsyms kbuild: explicitly specify the build id style scripts/setlocalversion: make git describe output more reliable kbuild: remove cc-option test of -Werror=date-time kbuild: remove cc-option test of -fno-stack-check kbuild: remove cc-option test of -fno-strict-overflow kbuild: move CFLAGS_{KASAN,UBSAN,KCSAN} exports to relevant Makefiles kbuild: remove redundant CONFIG_KASAN check from scripts/Makefile.kasan kbuild: do not create built-in objects for external module builds ...
2020-10-22bpf: Fix bpf_redirect_neigh helper api to support supplying nexthopToke Høiland-Jørgensen1-0/+1
Based on the discussion in [0], update the bpf_redirect_neigh() helper to accept an optional parameter specifying the nexthop information. This makes it possible to combine bpf_fib_lookup() and bpf_redirect_neigh() without incurring a duplicate FIB lookup - since the FIB lookup helper will return the nexthop information even if no neighbour is present, this can simply be passed on to bpf_redirect_neigh() if bpf_fib_lookup() returns BPF_FIB_LKUP_RET_NO_NEIGH. Thus fix & extend it before helper API is frozen. [0] https://lore.kernel.org/bpf/[email protected]/ Signed-off-by: Toke Høiland-Jørgensen <[email protected]> Signed-off-by: Daniel Borkmann <[email protected]> Reviewed-by: David Ahern <[email protected]> Link: https://lore.kernel.org/bpf/[email protected]