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If the driver fails to probe, make sure to disable runtime PM again.
While at it, make the cleanup code in ->remove() symmetric.
Signed-off-by: Thierry Reding <[email protected]>
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Make sure the SOR module is suspenden after we fail to register the SOR
pad output clock.
Signed-off-by: Thierry Reding <[email protected]>
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Provide missing default implementation for platform_init and drop copies
of default platform_init, platform_setup and platform_heartbeet from
platforms/*/setup.c
Signed-off-by: Max Filippov <[email protected]>
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Drop include directives for irrelevant headers in asm/platform.h and its
users. Sort remaining headers.
Signed-off-by: Max Filippov <[email protected]>
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There's no implementation for set_except_vector function in the xtensa
code. Drop its declaration.
Signed-off-by: Max Filippov <[email protected]>
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Pull updates from Andrew Morton:
"Most of -mm and quite a number of other subsystems: hotfixes, scripts,
ocfs2, misc, lib, binfmt, init, reiserfs, exec, dma-mapping, kcov.
MM is fairly quiet this time. Holidays, I assume"
* emailed patches from Andrew Morton <[email protected]>: (118 commits)
kcov: ignore fault-inject and stacktrace
include/linux/io-mapping.h-mapping: use PHYS_PFN() macro in io_mapping_map_atomic_wc()
execve: warn if process starts with executable stack
reiserfs: prevent NULL pointer dereference in reiserfs_insert_item()
init/main.c: fix misleading "This architecture does not have kernel memory protection" message
init/main.c: fix quoted value handling in unknown_bootoption
init/main.c: remove unnecessary repair_env_string in do_initcall_level
init/main.c: log arguments and environment passed to init
fs/binfmt_elf.c: coredump: allow process with empty address space to coredump
fs/binfmt_elf.c: coredump: delete duplicated overflow check
fs/binfmt_elf.c: coredump: allocate core ELF header on stack
fs/binfmt_elf.c: make BAD_ADDR() unlikely
fs/binfmt_elf.c: better codegen around current->mm
fs/binfmt_elf.c: don't copy ELF header around
fs/binfmt_elf.c: fix ->start_code calculation
fs/binfmt_elf.c: smaller code generation around auxv vector fill
lib/find_bit.c: uninline helper _find_next_bit()
lib/find_bit.c: join _find_next_bit{_le}
uapi: rename ext2_swab() to swab() and share globally in swab.h
lib/scatterlist.c: adjust indentation in __sg_alloc_table
...
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git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux
Pull module updates from Jessica Yu:
"Summary of modules changes for the 5.6 merge window:
- Add "MS" (SHF_MERGE|SHF_STRINGS) section flags to __ksymtab_strings
to indicate to the linker that it can perform string deduplication
(i.e., duplicate strings are reduced to a single copy in the string
table). This means any repeated namespace string would be merged to
just one entry in __ksymtab_strings.
- Various code cleanups and small fixes (fix small memleak in error
path, improve moduleparam docs, silence rcu warnings, improve error
logging)"
* tag 'modules-for-v5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux:
module.h: Annotate mod_kallsyms with __rcu
module: avoid setting info->name early in case we can fall back to info->mod->name
modsign: print module name along with error message
kernel/module: Fix memleak in module_add_modinfo_attrs()
export.h: reduce __ksymtab_strings string duplication by using "MS" section flags
moduleparam: fix kerneldoc
modules: lockdep: Suppress suspicious RCU usage warning
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Pull MIPS changes from Paul Burton:
"Nothing too big or scary in here:
- Support mremap() for the VDSO, primarily to allow CRIU to restore
the VDSO to its checkpointed location.
- Restore the MIPS32 cBPF JIT, after having reverted the enablement
of the eBPF JIT for MIPS32 systems in the 5.5 cycle.
- Improve cop0 counter synchronization behaviour whilst onlining CPUs
by running with interrupts disabled.
- Better match FPU behaviour when emulating multiply-accumulate
instructions on pre-r6 systems that implement IEEE754-2008 style
MACs.
- Loongson64 kernels now build using the MIPS64r2 ISA, allowing them
to take advantage of instructions introduced by r2.
- Support for the Ingenic X1000 SoC & the really nice little CU Neo
development board that's using it.
- Support for WMAC on GARDENA Smart Gateway devices.
- Lots of cleanup & refactoring of SGI IP27 (Origin 2*) support in
preparation for introducing IP35 (Origin 3*) support.
- Various Kconfig & Makefile cleanups"
* tag 'mips_5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux: (60 commits)
MIPS: PCI: Add detection of IOC3 on IO7, IO8, IO9 and Fuel
MIPS: Loongson64: Disable exec hazard
MIPS: Loongson64: Bump ISA level to MIPSR2
MIPS: Make DIEI support as a config option
MIPS: OCTEON: octeon-irq: fix spelling mistake "to" -> "too"
MIPS: asm: local: add barriers for Loongson
MIPS: Loongson64: Select mac2008 only feature
MIPS: Add MAC2008 Support
Revert "MIPS: Add custom serial.h with BASE_BAUD override for generic kernel"
MIPS: sort MIPS and MIPS_GENERIC Kconfig selects alphabetically (again)
MIPS: make CPU_HAS_LOAD_STORE_LR opt-out
MIPS: generic: don't unconditionally select PINCTRL
MIPS: don't explicitly select LIBFDT in Kconfig
MIPS: sync-r4k: do slave counter synchronization with disabled HW interrupts
MIPS: SGI-IP30: Check for valid pointer before using it
MIPS: syscalls: fix indentation of the 'SYSNR' message
MIPS: boot: fix typo in 'vmlinux.lzma.its' target
MIPS: fix indentation of the 'RELOCS' message
dt-bindings: Document loongson vendor-prefix
MIPS: CU1000-Neo: Refresh defconfig to support HWMON and WiFi.
...
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git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc
Pull ARC updates from Vineet Gupta:
- Wire up clone3 syscall
- ARCv2 FPU state save/restore across context switch
- AXS10x platform and misc fixes
* tag 'arc-5.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
ARCv2: fpu: preserve userspace fpu state
ARC: fpu: declutter code, move bits out into fpu.h
ARC: wireup clone3 syscall
ARC: [plat-axs10x]: Add missing multicast filter number to GMAC node
ARC: update feature support for jump-labels
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git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux
Pull RISC-V updates from Palmer Dabbelt:
"This contains a handful of patches for this merge window:
- Support for kasan
- 32-bit physical addresses on rv32i-based systems
- Support for CONFIG_DEBUG_VIRTUAL
- DT entry for the FU540 GPIO controller, which has recently had a
device driver merged
These boot a buildroot-based system on QEMU's virt board for me"
* tag 'riscv-for-linus-5.6-mw0' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
riscv: dts: Add DT support for SiFive FU540 GPIO driver
riscv: mm: add support for CONFIG_DEBUG_VIRTUAL
riscv: keep 32-bit kernel to 32-bit phys_addr_t
kasan: Add riscv to KASAN documentation.
riscv: Add KASAN support
kasan: No KASAN's memmove check if archs don't have it.
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CONFIG_VIRTUALIZATION may not be enabled for memory encrypted guests. If
disabled, decrypted per-CPU variables may end up sharing the same page
with variables that should be left encrypted.
Always separate per-CPU variables that should be decrypted into their own
page anytime memory encryption can be enabled in the guest rather than
rely on any other config option that may not be enabled.
Fixes: ac26963a1175 ("percpu: Introduce DEFINE_PER_CPU_DECRYPTED")
Cc: [email protected] # 4.15+
Signed-off-by: Erdem Aktas <[email protected]>
Signed-off-by: David Rientjes <[email protected]>
Signed-off-by: Dennis Zhou <[email protected]>
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The generic implementation of raw_cpu_generic_add_return() is:
#define raw_cpu_generic_add_return(pcp, val) \
({ \
typeof(&(pcp)) __p = raw_cpu_ptr(&(pcp)); \
\
*__p += val; \
*__p; \
})
where the 'pcp' argument is a __percpu lvalue.
There, the variable '__p' is declared as a __percpu pointer
the type of the address of 'pcp') but:
1) the value assigned to it, the return value of raw_cpu_ptr(), is
a plain (__kernel) pointer, not a __percpu one.
2) this variable is dereferenced just after while a __percpu
pointer is implicitly __noderef.
So, fix the declaration of the 'pcp' variable to its correct type:
the plain (non-percpu) pointer corresponding to pcp's address,
using the fact that typeof() ignores the address space and the
'noderef' attribute of its agument.
Same for raw_cpu_generic_xchg(), raw_cpu_generic_cmpxchg() &
raw_cpu_generic_cmpxchg_double().
This removes 209 warnings on ARM, 525 on ARM64, 220 on x86 &
more than 2600 on ppc64 (all of them with the default config).
Cc: Tejun Heo <[email protected]>
Cc: Nicholas Piggin <[email protected]>
Reported-by: Ben Dooks <[email protected]>
Signed-off-by: Luc Van Oostenryck <[email protected]>
Acked-by: Christoph Lameter <[email protected]>
Signed-off-by: Dennis Zhou <[email protected]>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Ingo Molnar:
"Misc fixes:
- three fixes and a cleanup for the resctrl code
- a HyperV fix
- a fix to /proc/kcore contents in live debugging sessions
- a fix for the x86 decoder opcode map"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/decoder: Add TEST opcode to Group3-2
x86/resctrl: Clean up unused function parameter in mkdir path
x86/resctrl: Fix a deadlock due to inaccurate reference
x86/resctrl: Fix use-after-free due to inaccurate refcount of rdtgroup
x86/resctrl: Fix use-after-free when deleting resource groups
x86/hyper-v: Add "polling" bit to hv_synic_sint
x86/crash: Define arch_crash_save_vmcoreinfo() if CONFIG_CRASH_CORE=y
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Break an infinite loop when early parsing of the SRAT table is caused
by a subtable with zero length. Known to affect the ASUS WS X299 SAGE
motherboard with firmware version 1201 which has a large block of
zeros in its SRAT table. The kernel could boot successfully on this
board/firmware prior to the introduction of early parsing this table or
after a BIOS update.
[ bp: Fixup whitespace damage and commit message. Make it return 0 to
denote that there are no immovable regions because who knows what
else is broken in this BIOS. ]
Fixes: 02a3e3cdb7f1 ("x86/boot: Parse SRAT table and count immovable memory regions")
Signed-off-by: Steven Clarkson <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Cc: [email protected]
Link: https://bugzilla.kernel.org/show_bug.cgi?id=206343
Link: https://lkml.kernel.org/r/CAHKq8taGzj0u1E_i=poHUam60Bko5BpiJ9jn0fAupFUYexvdUQ@mail.gmail.com
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In the flowtable documentation there is a missing semicolon, the command
as is would give this error:
nftables.conf:5:27-33: Error: syntax error, unexpected devices, expecting newline or semicolon
hook ingress priority 0 devices = { br0, pppoe-data };
^^^^^^^
nftables.conf:4:12-13: Error: invalid hook (null)
flowtable ft {
^^
Fixes: 19b351f16fd9 ("netfilter: add flowtable documentation")
Signed-off-by: Matteo Croce <[email protected]>
Signed-off-by: Pablo Neira Ayuso <[email protected]>
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During the refactor this was accidently removed.
Fixes: ae29045018c8 ("netfilter: flowtable: add nf_flow_offload_tuple() helper")
Signed-off-by: Paul Blakey <[email protected]>
Signed-off-by: Pablo Neira Ayuso <[email protected]>
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If entries exist when freeing a hardware offload enabled table,
we queue work for hardware while running the gc iteration.
Execute it (flush) after queueing.
Fixes: c29f74e0df7a ("netfilter: nf_flow_table: hardware offload support")
Signed-off-by: Paul Blakey <[email protected]>
Signed-off-by: Pablo Neira Ayuso <[email protected]>
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On netdev down event, nf_flow_table_cleanup() is called for the relevant
device and it cleans all the tables that are on that device.
If one of those tables has hardware offload flag,
nf_flow_table_iterate_cleanup flushes hardware and then runs the gc.
But the gc can queue more hardware work, which will take time to execute.
Instead first add the work, then flush it, to execute it now.
Fixes: c29f74e0df7a ("netfilter: nf_flow_table: hardware offload support")
Signed-off-by: Paul Blakey <[email protected]>
Signed-off-by: Pablo Neira Ayuso <[email protected]>
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Convert the uses of kvmalloc_array with __GFP_ZERO to
the equivalent kvcalloc.
Signed-off-by: Joe Perches <[email protected]>
Signed-off-by: Pablo Neira Ayuso <[email protected]>
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Don't instrument 3 more files that contain debugging facilities and
produce large amounts of uninteresting coverage for every syscall.
The following snippets are sprinkled all over the place in kcov traces
in a debugging kernel. We already try to disable instrumentation of
stack unwinding code and of most debug facilities. I guess we did not
use fault-inject.c at the time, and stacktrace.c was somehow missed (or
something has changed in kernel/configs). This change both speeds up
kcov (kernel doesn't need to store these PCs, user-space doesn't need to
process them) and frees trace buffer capacity for more useful coverage.
should_fail
lib/fault-inject.c:149
fail_dump
lib/fault-inject.c:45
stack_trace_save
kernel/stacktrace.c:124
stack_trace_consume_entry
kernel/stacktrace.c:86
stack_trace_consume_entry
kernel/stacktrace.c:89
... a hundred frames skipped ...
stack_trace_consume_entry
kernel/stacktrace.c:93
stack_trace_consume_entry
kernel/stacktrace.c:86
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Dmitry Vyukov <[email protected]>
Reviewed-by: Andrey Konovalov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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io_mapping_map_atomic_wc()
Use PHYS_PFN() macro in io_mapping_map_atomic_wc() instead of open coded
variant.
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Andy Shevchenko <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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There were few episodes of silent downgrade to an executable stack over
years:
1) linking innocent looking assembly file will silently add executable
stack if proper linker options is not given as well:
$ cat f.S
.intel_syntax noprefix
.text
.globl f
f:
ret
$ cat main.c
void f(void);
int main(void)
{
f();
return 0;
}
$ gcc main.c f.S
$ readelf -l ./a.out
GNU_STACK 0x0000000000000000 0x0000000000000000 0x0000000000000000
0x0000000000000000 0x0000000000000000 RWE 0x10
^^^
2) converting C99 nested function into a closure
https://nullprogram.com/blog/2019/11/15/
void intsort2(int *base, size_t nmemb, _Bool invert)
{
int cmp(const void *a, const void *b)
{
int r = *(int *)a - *(int *)b;
return invert ? -r : r;
}
qsort(base, nmemb, sizeof(*base), cmp);
}
will silently require stack trampolines while non-closure version will
not.
Without doubt this behaviour is documented somewhere, add a warning so
that developers and users can at least notice. After so many years of
x86_64 having proper executable stack support it should not cause too
many problems.
Link: http://lkml.kernel.org/r/20191208171918.GC19716@avx2
Signed-off-by: Alexey Dobriyan <[email protected]>
Cc: Dan Carpenter <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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The variable inode may be NULL in reiserfs_insert_item(), but there is
no check before accessing the member of inode.
Fix this by adding NULL pointer check before calling reiserfs_debug().
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Yunfeng Ye <[email protected]>
Cc: zhengbin <[email protected]>
Cc: Hu Shiyuan <[email protected]>
Cc: Feilong Lin <[email protected]>
Cc: Jan Kara <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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protection" message
This message leads to thinking that memory protection is not implemented
for the said architecture, whereas absence of CONFIG_STRICT_KERNEL_RWX
only means that memory protection has not been selected at compile time.
Don't print this message when CONFIG_ARCH_HAS_STRICT_KERNEL_RWX is
selected by the architecture. Instead, print "Kernel memory protection
not selected by kernel config."
Link: http://lkml.kernel.org/r/62477e446d9685459d4f27d193af6ff1bd69d55f.1578557581.git.christophe.leroy@c-s.fr
Signed-off-by: Christophe Leroy <[email protected]>
Acked-by: Kees Cook <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Michael Ellerman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Patch series "init/main.c: minor cleanup/bugfix of envvar handling", v2.
unknown_bootoption passes unrecognized command line arguments to init as
either environment variables or arguments. Some of the logic in the
function is broken for quoted command line arguments.
When an argument of the form param="value" is processed by parse_args
and passed to unknown_bootoption, the command line has
param\0"value\0
with val pointing to the beginning of value. The helper function
repair_env_string is then used to restore the '=' character that was
removed by parse_args, and strip the quotes off fully. This results in
param=value\0\0
and val ends up pointing to the 'a' instead of the 'v' in value. This
bug was introduced when repair_env_string was refactored into a separate
function, and the decrement of val in repair_env_string became dead
code.
This causes two problems in unknown_bootoption in the two places where
the val pointer is used as a substitute for the length of param:
1. An argument of the form param=".value" is misinterpreted as a
potential module parameter, with the result that it will not be
placed in init's environment.
2. An argument of the form param="value" is checked to see if param is
an existing environment variable that should be overwritten, but the
comparison is off-by-one and compares 'param=v' instead of 'param='
against the existing environment. So passing, for example,
TERM="vt100" on the command line results in init being passed both
TERM=linux and TERM=vt100 in its environment.
Patch 1 adds logging for the arguments and environment passed to init
and is independent of the rest: it can be dropped if this is
unnecessarily verbose.
Patch 2 removes repair_env_string from initcall parameter parsing in
do_initcall_level, as that uses a separate copy of the command line now
and the repairing is no longer necessary.
Patch 3 fixes the bug in unknown_bootoption by recording the length of
param explicitly instead of implying it from val-param.
This patch (of 3):
Commit a99cd1125189 ("init: fix bug where environment vars can't be
passed via boot args") introduced two minor bugs in unknown_bootoption
by factoring out the quoted value handling into a separate function.
When value is quoted, repair_env_string will move the value up 1 byte to
strip the quotes, so val in unknown_bootoption no longer points to the
actual location of the value.
The result is that an argument of the form param=".value" is mistakenly
treated as a potential module parameter and is not placed in init's
environment, and an argument of the form param="value" can result in a
duplicate environment variable: eg TERM="vt100" on the command line will
result in both TERM=linux and TERM=vt100 being placed into init's
environment.
Fix this by recording the length of the param before calling
repair_env_string instead of relying on val.
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arvind Sankar <[email protected]>
Cc: Chris Metcalf <[email protected]>
Cc: Krzysztof Mazur <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Since commit 08746a65c296 ("init: fix in-place parameter modification
regression"), parse_args in do_initcall_level is called on a copy of
saved_command_line. It is unnecessary to call repair_env_string during
this parsing, as this copy is not used for anything later.
Remove the now unnecessary arguments from repair_env_string as well.
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arvind Sankar <[email protected]>
Cc: Krzysztof Mazur <[email protected]>
Cc: Chris Metcalf <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Extend logging in `run_init_process` to also show the arguments and
environment that we are passing to init.
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arvind Sankar <[email protected]>
Cc: Chris Metcalf <[email protected]>
Cc: Krzysztof Mazur <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Unmapping whole address space at once with
munmap(0, (1ULL<<47) - 4096)
or equivalent will create empty coredump.
It is silly way to exit, however registers content may still be useful.
The right to coredump is fundamental right of a process!
Link: http://lkml.kernel.org/r/20191222150137.GA1277@avx2
Signed-off-by: Alexey Dobriyan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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array_size() macro will do overflow check anyway.
Link: http://lkml.kernel.org/r/20191222144009.GB24341@avx2
Signed-off-by: Alexey Dobriyan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Comment says ELF header is "too large to be on stack". 64 bytes on
64-bit is not large by any means.
Link: http://lkml.kernel.org/r/20191222143850.GA24341@avx2
Signed-off-by: Alexey Dobriyan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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If some mapping goes past TASK_SIZE it will be rejected by kernel which
means no such userspace binaries exist.
Mark every such check as unlikely.
Link: http://lkml.kernel.org/r/20191215124355.GA21124@avx2
Signed-off-by: Alexey Dobriyan <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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"current->mm" pointer is stable in general except few cases one of which
execve(2). Compiler can't treat is as stable but it _is_ stable most of
the time. During ELF loading process ->mm becomes stable right after
flush_old_exec().
Help compiler by caching current->mm, otherwise it continues to refetch
it.
add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-141 (-141)
Function old new delta
elf_core_dump 5062 5039 -23
load_elf_binary 5426 5308 -118
Note: other cases are left as is because it is either pessimisation or
no change in binary size.
Link: http://lkml.kernel.org/r/20191215124755.GB21124@avx2
Signed-off-by: Alexey Dobriyan <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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ELF header is read into bprm->buf[] by generic execve code.
Save a memcpy and allocate just one header for the interpreter instead
of two headers (64 bytes instead of 128 on 64-bit).
Link: http://lkml.kernel.org/r/20191208171242.GA19716@avx2
Signed-off-by: Alexey Dobriyan <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Only executable segments should be accounted to ->start_code just like
they do to ->end_code (correctly).
Link: http://lkml.kernel.org/r/20191208171410.GB19716@avx2
Signed-off-by: Alexey Dobriyan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Filling auxv vector as array with index (auxv[i++] = ...) generates
terrible code. "saved_auxv" should be reworked because it is the worst
member of mm_struct by size/usefullness ratio but do it later.
Meanwhile help gcc a little with *auxv++ idiom.
Space savings on x86_64:
add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-127 (-127)
Function old new delta
load_elf_binary 5470 5343 -127
Link: http://lkml.kernel.org/r/20191208172301.GD19716@avx2
Signed-off-by: Alexey Dobriyan <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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It saves 25% of .text for arm64, and more for BE architectures.
Before:
$ size lib/find_bit.o
text data bss dec hex filename
1012 56 0 1068 42c lib/find_bit.o
After:
$ size lib/find_bit.o
text data bss dec hex filename
776 56 0 832 340 lib/find_bit.o
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Yury Norov <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Allison Randal <[email protected]>
Cc: William Breathitt Gray <[email protected]>
Cc: Joe Perches <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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_find_next_bit and _find_next_bit_le are very similar functions. It's
possible to join them by adding 1 parameter and a couple of simple
checks. It's simplify maintenance and make possible to shrink the size
of .text by un-inlining the unified function (in the following patch).
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Yury Norov <[email protected]>
Cc: Allison Randal <[email protected]>
Cc: Joe Perches <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: William Breathitt Gray <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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ext2_swab() is defined locally in lib/find_bit.c However it is not
specific to ext2, neither to bitmaps.
There are many potential users of it, so rename it to just swab() and
move to include/uapi/linux/swab.h
ABI guarantees that size of unsigned long corresponds to BITS_PER_LONG,
therefore drop unneeded cast.
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Yury Norov <[email protected]>
Cc: Allison Randal <[email protected]>
Cc: Joe Perches <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: William Breathitt Gray <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Clang warns:
../lib/scatterlist.c:314:5: warning: misleading indentation; statement
is not part of the previous 'if' [-Wmisleading-indentation]
return -ENOMEM;
^
../lib/scatterlist.c:311:4: note: previous statement is here
if (prv)
^
1 warning generated.
This warning occurs because there is a space before the tab on this
line. Remove it so that the indentation is consistent with the Linux
kernel coding style and clang no longer warns.
Link: http://lkml.kernel.org/r/[email protected]
Link: https://github.com/ClangBuiltLinux/linux/issues/830
Fixes: edce6820a9fd ("scatterlist: prevent invalid free when alloc fails")
Signed-off-by: Nathan Chancellor <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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In order to benefit from s390 zlib hardware compression support,
increase the btrfs zlib workspace buffer size from 1 to 4 pages (if s390
zlib hardware support is enabled on the machine).
This brings up to 60% better performance in hardware on s390 compared to
the PAGE_SIZE buffer and much more compared to the software zlib
processing in btrfs. In case of memory pressure, fall back to a single
page buffer during workspace allocation.
The data compressed with larger input buffers will still conform to zlib
standard and thus can be decompressed also on a systems that uses only
PAGE_SIZE buffer for btrfs zlib.
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Mikhail Zaslonko <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Cc: Chris Mason <[email protected]>
Cc: Josef Bacik <[email protected]>
Cc: David Sterba <[email protected]>
Cc: Richard Purdie <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Vasily Gorbik <[email protected]>
Cc: Christian Borntraeger <[email protected]>
Cc: Eduard Shishkin <[email protected]>
Cc: Ilya Leoshkevich <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Add a new function to zlib.h checking if s390 Deflate-Conversion
facility is installed and enabled.
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Mikhail Zaslonko <[email protected]>
Cc: Chris Mason <[email protected]>
Cc: Christian Borntraeger <[email protected]>
Cc: David Sterba <[email protected]>
Cc: Eduard Shishkin <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Ilya Leoshkevich <[email protected]>
Cc: Josef Bacik <[email protected]>
Cc: Richard Purdie <[email protected]>
Cc: Vasily Gorbik <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Add the new kernel command line parameter 'dfltcc=' to configure s390
zlib hardware support.
Format: { on | off | def_only | inf_only | always }
on: s390 zlib hardware support for compression on
level 1 and decompression (default)
off: No s390 zlib hardware support
def_only: s390 zlib hardware support for deflate
only (compression on level 1)
inf_only: s390 zlib hardware support for inflate
only (decompression)
always: Same as 'on' but ignores the selected compression
level always using hardware support (used for debugging)
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Mikhail Zaslonko <[email protected]>
Cc: Chris Mason <[email protected]>
Cc: Christian Borntraeger <[email protected]>
Cc: David Sterba <[email protected]>
Cc: Eduard Shishkin <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Ilya Leoshkevich <[email protected]>
Cc: Josef Bacik <[email protected]>
Cc: Richard Purdie <[email protected]>
Cc: Vasily Gorbik <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Add decompression functions to zlib_dfltcc library. Update zlib_inflate
functions with the hooks for s390 hardware support and adjust workspace
structures with extra parameter lists required for hardware inflate
decompression.
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ilya Leoshkevich <[email protected]>
Signed-off-by: Mikhail Zaslonko <[email protected]>
Co-developed-by: Ilya Leoshkevich <[email protected]>
Cc: Chris Mason <[email protected]>
Cc: Christian Borntraeger <[email protected]>
Cc: David Sterba <[email protected]>
Cc: Eduard Shishkin <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Josef Bacik <[email protected]>
Cc: Richard Purdie <[email protected]>
Cc: Vasily Gorbik <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Change the conflicting macro name in preparation for zlib_inflate
hardware support.
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Mikhail Zaslonko <[email protected]>
Reviewed-by: Christian Borntraeger <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Patch series "S390 hardware support for kernel zlib", v3.
With IBM z15 mainframe the new DFLTCC instruction is available. It
implements deflate algorithm in hardware (Nest Acceleration Unit - NXU)
with estimated compression and decompression performance orders of
magnitude faster than the current zlib.
This patchset adds s390 hardware compression support to kernel zlib.
The code is based on the userspace zlib implementation:
https://github.com/madler/zlib/pull/410
The coding style is also preserved for future maintainability. There is
only limited set of userspace zlib functions represented in kernel.
Apart from that, all the memory allocation should be performed in
advance. Thus, the workarea structures are extended with the parameter
lists required for the DEFLATE CONVENTION CALL instruction.
Since kernel zlib itself does not support gzip headers, only Adler-32
checksum is processed (also can be produced by DFLTCC facility). Like
it was implemented for userspace, kernel zlib will compress in hardware
on level 1, and in software on all other levels. Decompression will
always happen in hardware (when enabled).
Two DFLTCC compression calls produce the same results only when they
both are made on machines of the same generation, and when the
respective buffers have the same offset relative to the start of the
page. Therefore care should be taken when using hardware compression
when reproducible results are desired. However it does always produce
the standard conform output which can be inflated anyway.
The new kernel command line parameter 'dfltcc' is introduced to
configure s390 zlib hardware support:
Format: { on | off | def_only | inf_only | always }
on: s390 zlib hardware support for compression on
level 1 and decompression (default)
off: No s390 zlib hardware support
def_only: s390 zlib hardware support for deflate
only (compression on level 1)
inf_only: s390 zlib hardware support for inflate
only (decompression)
always: Same as 'on' but ignores the selected compression
level always using hardware support (used for debugging)
The main purpose of the integration of the NXU support into the kernel
zlib is the use of hardware deflate in btrfs filesystem with on-the-fly
compression enabled. Apart from that, hardware support can also be used
during boot for decompressing the kernel or the ramdisk image
With the patch for btrfs expanding zlib buffer from 1 to 4 pages (patch
6) the following performance results have been achieved using the
ramdisk with btrfs. These are relative numbers based on throughput rate
and compression ratio for zlib level 1:
Input data Deflate rate Inflate rate Compression ratio
NXU/Software NXU/Software NXU/Software
stream of zeroes 1.46 1.02 1.00
random ASCII data 10.44 3.00 0.96
ASCII text (dickens) 6,21 3.33 0.94
binary data (vmlinux) 8,37 3.90 1.02
This means that s390 hardware deflate can provide up to 10 times faster
compression (on level 1) and up to 4 times faster decompression (refers
to all compression levels) for btrfs zlib.
Disclaimer: Performance results are based on IBM internal tests using DD
command-line utility on btrfs on a Fedora 30 based internal driver in
native LPAR on a z15 system. Results may vary based on individual
workload, configuration and software levels.
This patch (of 9):
Create zlib_dfltcc library with the s390 DEFLATE CONVERSION CALL
implementation and related compression functions. Update zlib_deflate
functions with the hooks for s390 hardware support and adjust workspace
structures with extra parameter lists required for hardware deflate.
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ilya Leoshkevich <[email protected]>
Signed-off-by: Mikhail Zaslonko <[email protected]>
Co-developed-by: Ilya Leoshkevich <[email protected]>
Cc: Chris Mason <[email protected]>
Cc: Christian Borntraeger <[email protected]>
Cc: David Sterba <[email protected]>
Cc: Eduard Shishkin <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Josef Bacik <[email protected]>
Cc: Richard Purdie <[email protected]>
Cc: Vasily Gorbik <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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This switches the qcom-vadc-common to use milli_kelvin_to_millicelsius()
in <linux/units.h>.
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Akinobu Mita <[email protected]>
Acked-by: Jonathan Cameron <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Cc: Hartmut Knaack <[email protected]>
Cc: Lars-Peter Clausen <[email protected]>
Cc: Peter Meerwald-Stadler <[email protected]>
Cc: Amit Kucheria <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Daniel Lezcano <[email protected]>
Cc: Darren Hart <[email protected]>
Cc: Emmanuel Grumbach <[email protected]>
Cc: Guenter Roeck <[email protected]>
Cc: Jean Delvare <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: Jonathan Cameron <[email protected]>
Cc: Kalle Valo <[email protected]>
Cc: Keith Busch <[email protected]>
Cc: Luca Coelho <[email protected]>
Cc: Sagi Grimberg <[email protected]>
Cc: Stanislaw Gruszka <[email protected]>
Cc: Sujith Thomas <[email protected]>
Cc: Zhang Rui <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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This removes unused TO_MCELSIUS() macro.
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Akinobu Mita <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Cc: Zhang Rui <[email protected]>
Cc: Daniel Lezcano <[email protected]>
Cc: Amit Kucheria <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Darren Hart <[email protected]>
Cc: Emmanuel Grumbach <[email protected]>
Cc: Guenter Roeck <[email protected]>
Cc: Hartmut Knaack <[email protected]>
Cc: Jean Delvare <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: Jonathan Cameron <[email protected]>
Cc: Jonathan Cameron <[email protected]>
Cc: Kalle Valo <[email protected]>
Cc: Keith Busch <[email protected]>
Cc: Lars-Peter Clausen <[email protected]>
Cc: Luca Coelho <[email protected]>
Cc: Peter Meerwald-Stadler <[email protected]>
Cc: Sagi Grimberg <[email protected]>
Cc: Stanislaw Gruszka <[email protected]>
Cc: Sujith Thomas <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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This switches the iwlwifi driver to use celsius_to_kelvin() and
kelvin_to_celsius() in <linux/units.h>.
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Akinobu Mita <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Acked-by: Luca Coelho <[email protected]>
Cc: Kalle Valo <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: Emmanuel Grumbach <[email protected]>
Cc: Luca Coelho <[email protected]>
Cc: Amit Kucheria <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Daniel Lezcano <[email protected]>
Cc: Darren Hart <[email protected]>
Cc: Guenter Roeck <[email protected]>
Cc: Hartmut Knaack <[email protected]>
Cc: Jean Delvare <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Jonathan Cameron <[email protected]>
Cc: Jonathan Cameron <[email protected]>
Cc: Keith Busch <[email protected]>
Cc: Lars-Peter Clausen <[email protected]>
Cc: Peter Meerwald-Stadler <[email protected]>
Cc: Sagi Grimberg <[email protected]>
Cc: Stanislaw Gruszka <[email protected]>
Cc: Sujith Thomas <[email protected]>
Cc: Zhang Rui <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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This switches the iwlegacy driver to use celsius_to_kelvin() and
kelvin_to_celsius() in <linux/units.h>.
[[email protected]: fix build warnings with format string]
Link: http://lkml.kernel.org/r/[email protected]
Link: https://lore.kernel.org/r/[email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Akinobu Mita <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Acked-by: Kalle Valo <[email protected]>
Cc: Kalle Valo <[email protected]>
Cc: Stanislaw Gruszka <[email protected]>
Cc: Amit Kucheria <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Daniel Lezcano <[email protected]>
Cc: Darren Hart <[email protected]>
Cc: Emmanuel Grumbach <[email protected]>
Cc: Guenter Roeck <[email protected]>
Cc: Hartmut Knaack <[email protected]>
Cc: Jean Delvare <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: Jonathan Cameron <[email protected]>
Cc: Keith Busch <[email protected]>
Cc: Lars-Peter Clausen <[email protected]>
Cc: Luca Coelho <[email protected]>
Cc: Peter Meerwald-Stadler <[email protected]>
Cc: Sagi Grimberg <[email protected]>
Cc: Sujith Thomas <[email protected]>
Cc: Zhang Rui <[email protected]>
Cc: Stephen Rothwell <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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This removes the kelvin to/from Celsius conversion helper macros in
<linux/thermal.h> which were switched to the inline helper functions in
<linux/units.h>.
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Akinobu Mita <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Cc: Sujith Thomas <[email protected]>
Cc: Darren Hart <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Zhang Rui <[email protected]>
Cc: Daniel Lezcano <[email protected]>
Cc: Amit Kucheria <[email protected]>
Cc: Jean Delvare <[email protected]>
Cc: Guenter Roeck <[email protected]>
Cc: Keith Busch <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Sagi Grimberg <[email protected]>
Cc: Emmanuel Grumbach <[email protected]>
Cc: Hartmut Knaack <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: Jonathan Cameron <[email protected]>
Cc: Jonathan Cameron <[email protected]>
Cc: Kalle Valo <[email protected]>
Cc: Lars-Peter Clausen <[email protected]>
Cc: Luca Coelho <[email protected]>
Cc: Peter Meerwald-Stadler <[email protected]>
Cc: Stanislaw Gruszka <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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