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2020-12-02NFS: Improve handling of directory verifiersTrond Myklebust1-1/+7
If the server insists on using the readdir verifiers in order to allow cookies to expire, then we should ensure that we cache the verifier with the cookie, so that we can return an error if the application tries to use the expired cookie. Signed-off-by: Trond Myklebust <[email protected]> Reviewed-by: Benjamin Coddington <[email protected]> Tested-by: Benjamin Coddington <[email protected]> Tested-by: Dave Wysochanski <[email protected]>
2020-12-02NFS: Allow the NFS generic code to pass in a verifier to readdirTrond Myklebust1-2/+15
If we're ever going to allow support for servers that use the readdir verifier, then that use needs to be managed by the middle layers as those need to be able to reject cookies from other verifiers. Signed-off-by: Trond Myklebust <[email protected]> Reviewed-by: Benjamin Coddington <[email protected]> Tested-by: Benjamin Coddington <[email protected]> Tested-by: Dave Wysochanski <[email protected]>
2020-12-02NFS: More readdir cleanupsTrond Myklebust1-1/+0
Remove the redundant caching of the credential in struct nfs_open_dir_context. Pass the buffer size as an argument to nfs_readdir_xdr_filler(). Signed-off-by: Trond Myklebust <[email protected]> Reviewed-by: Benjamin Coddington <[email protected]> Tested-by: Benjamin Coddington <[email protected]> Tested-by: Dave Wysochanski <[email protected]>
2020-12-02bio: optimise bvec iterationPavel Begunkov1-2/+15
__bio_for_each_bvec(), __bio_for_each_segment() and bio_copy_data_iter() fall under conditions of bvec_iter_advance_single(), which is a faster and slimmer version of bvec_iter_advance(). Add bio_advance_iter_single() and convert them. Signed-off-by: Pavel Begunkov <[email protected]> Reviewed-by: Christoph Hellwig <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
2020-12-02block: optimise for_each_bvec() advancePavel Begunkov1-5/+15
Because of how for_each_bvec() works it never advances across multiple entries at a time, so bvec_iter_advance() is an overkill. Add specialised bvec_iter_advance_single() that is faster. It also handles zero-len bvecs, so can kill bvec_iter_skip_zero_bvec(). text data bss dec hex filename before: 23977 805 0 24782 60ce lib/iov_iter.o before, bvec_iter_advance() w/o WARN_ONCE() 22886 600 0 23486 5bbe ./lib/iov_iter.o after: 21862 600 0 22462 57be lib/iov_iter.o Signed-off-by: Pavel Begunkov <[email protected]> Reviewed-by: Ming Lei <[email protected]> Reviewed-by: Christoph Hellwig <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
2020-12-02entry: Add syscall_exit_to_user_mode_work()Sven Schnelle1-0/+20
This is the same as syscall_exit_to_user_mode() but without calling exit_to_user_mode(). This can be used if there is an architectural reason to avoid the combo function, e.g. restarting a syscall without returning to userspace. Before returning to user space the caller has to invoke exit_to_user_mode(). [ tglx: Amended comments ] Signed-off-by: Sven Schnelle <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2020-12-02entry: Add exit_to_user_mode() wrapperSven Schnelle1-2/+21
Called from architecture specific code when syscall_exit_to_user_mode() is not suitable. It simply calls __exit_to_user_mode(). This way __exit_to_user_mode() can still be inlined because it is declared static __always_inline. [ tglx: Amended comments and moved it to a different place in the header ] Signed-off-by: Sven Schnelle <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2020-12-02entry_Add_enter_from_user_mode_wrapperSven Schnelle1-1/+23
To be called from architecture specific code if the combo interfaces are not suitable. It simply calls __enter_from_user_mode(). This way __enter_from_user_mode will still be inlined because it is declared static __always_inline. [ tglx: Amend comments and move it to a different location in the header ] Signed-off-by: Sven Schnelle <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2020-12-02entry: Support Syscall User Dispatch on common syscall entryGabriel Krisman Bertazi1-0/+2
Syscall User Dispatch (SUD) must take precedence over seccomp and ptrace, since the use case is emulation (it can be invoked with a different ABI) such that seccomp filtering by syscall number doesn't make sense in the first place. In addition, either the syscall is dispatched back to userspace, in which case there is no resource for to trace, or the syscall will be executed, and seccomp/ptrace will execute next. Since SUD runs before tracepoints, it needs to be a SYSCALL_WORK_EXIT as well, just to prevent a trace exit event when dispatch was triggered. For that, the on_syscall_dispatch() examines context to skip the tracepoint, audit and other work. [ tglx: Add a comment on the exit side ] Signed-off-by: Gabriel Krisman Bertazi <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Reviewed-by: Andy Lutomirski <[email protected]> Acked-by: Peter Zijlstra (Intel) <[email protected]> Acked-by: Kees Cook <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2020-12-02kernel: Implement selective syscall userspace redirectionGabriel Krisman Bertazi3-0/+44
Introduce a mechanism to quickly disable/enable syscall handling for a specific process and redirect to userspace via SIGSYS. This is useful for processes with parts that require syscall redirection and parts that don't, but who need to perform this boundary crossing really fast, without paying the cost of a system call to reconfigure syscall handling on each boundary transition. This is particularly important for Windows games running over Wine. The proposed interface looks like this: prctl(PR_SET_SYSCALL_USER_DISPATCH, <op>, <off>, <length>, [selector]) The range [<offset>,<offset>+<length>) is a part of the process memory map that is allowed to by-pass the redirection code and dispatch syscalls directly, such that in fast paths a process doesn't need to disable the trap nor the kernel has to check the selector. This is essential to return from SIGSYS to a blocked area without triggering another SIGSYS from rt_sigreturn. selector is an optional pointer to a char-sized userspace memory region that has a key switch for the mechanism. This key switch is set to either PR_SYS_DISPATCH_ON, PR_SYS_DISPATCH_OFF to enable and disable the redirection without calling the kernel. The feature is meant to be set per-thread and it is disabled on fork/clone/execv. Internally, this doesn't add overhead to the syscall hot path, and it requires very little per-architecture support. I avoided using seccomp, even though it duplicates some functionality, due to previous feedback that maybe it shouldn't mix with seccomp since it is not a security mechanism. And obviously, this should never be considered a security mechanism, since any part of the program can by-pass it by using the syscall dispatcher. For the sysinfo benchmark, which measures the overhead added to executing a native syscall that doesn't require interception, the overhead using only the direct dispatcher region to issue syscalls is pretty much irrelevant. The overhead of using the selector goes around 40ns for a native (unredirected) syscall in my system, and it is (as expected) dominated by the supervisor-mode user-address access. In fact, with SMAP off, the overhead is consistently less than 5ns on my test box. Signed-off-by: Gabriel Krisman Bertazi <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Reviewed-by: Andy Lutomirski <[email protected]> Acked-by: Peter Zijlstra (Intel) <[email protected]> Acked-by: Kees Cook <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2020-12-02Merge branch ↵Mark Brown2-0/+67
'20201104_yung_chuan_liao_regmap_soundwire_asoc_add_soundwire_sdca_support' (early part) into asoc-5.11
2020-12-02Merge tag 'soundwire-for-asoc-5.11' of ↵Mark Brown1-0/+4
git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/soundwire into asoc-5.11 soundwire-for-asoc-5.11 Tag for asoc to resolve build dependency with commit b7cab9be7c16 ("soundwire: SDCA: detect sdca_cascade interrupt")
2020-12-01Merge tag 'v5.10-rc6' into rdma.git for-nextJason Gunthorpe5-18/+33
For dependencies in following patches Signed-off-by: Jason Gunthorpe <[email protected]>
2020-12-01net: delete __dev_getfirstbyhwtypeVladimir Oltean1-1/+0
The last user of the RTNL brother of dev_getfirstbyhwtype (the latter being synchronized under RCU) has been deleted in commit b4db2b35fc44 ("afs: Use core kernel UUID generation"). Cc: Arnd Bergmann <[email protected]> Cc: David Howells <[email protected]> Cc: Eric Dumazet <[email protected]> Signed-off-by: Vladimir Oltean <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
2020-12-01Merge tag 'trace-v5.10-rc6' of ↵Linus Torvalds1-0/+3
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace Pull tracing fixes from Steven Rostedt: - Use correct timestamp variable for ring buffer write stamp update - Fix up before stamp and write stamp when crossing ring buffer sub buffers - Keep a zero delta in ring buffer in slow path if cmpxchg fails - Fix trace_printk static buffer for archs that care - Fix ftrace record accounting for ftrace ops with trampolines - Fix DYNAMIC_FTRACE_WITH_DIRECT_CALLS dependency - Remove WARN_ON in hwlat tracer that triggers on something that is OK - Make "my_tramp" trampoline in ftrace direct sample code global - Fixes in the bootconfig tool for better alignment management * tag 'trace-v5.10-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: ring-buffer: Always check to put back before stamp when crossing pages ftrace: Fix DYNAMIC_FTRACE_WITH_DIRECT_CALLS dependency ftrace: Fix updating FTRACE_FL_TRAMP tracing: Fix alignment of static buffer tracing: Remove WARN_ON in start_thread() samples/ftrace: Mark my_tramp[12]? global ring-buffer: Set the right timestamp in the slow path of __rb_reserve_next() ring-buffer: Update write stamp with the correct ts docs: bootconfig: Update file format on initrd image tools/bootconfig: Align the bootconfig applied initrd image size to 4 tools/bootconfig: Fix to check the write failure correctly tools/bootconfig: Fix errno reference after printf()
2020-12-01block: merge struct block_device and struct hd_structChristoph Hellwig3-34/+15
Instead of having two structures that represent each block device with different life time rules, merge them into a single one. This also greatly simplifies the reference counting rules, as we can use the inode reference count as the main reference count for the new struct block_device, with the device model reference front ending it for device model interaction. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Jan Kara <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
2020-12-01block: switch disk_part_iter_* to use a struct block_deviceChristoph Hellwig1-2/+2
Switch the partition iter infrastructure to iterate over block_device references instead of hd_struct ones mostly used to get at the block_device. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Jan Kara <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
2020-12-01block: remove the partno field from struct hd_structChristoph Hellwig1-1/+0
Just use the bd_partno field in struct block_device everywhere. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Jan Kara <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
2020-12-01block: switch partition lookup to use struct block_deviceChristoph Hellwig3-15/+14
Use struct block_device to lookup partitions on a disk. This removes all usage of struct hd_struct from the I/O path. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Jan Kara <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Coly Li <[email protected]> [bcache] Acked-by: Chao Yu <[email protected]> [f2fs] Signed-off-by: Jens Axboe <[email protected]>
2020-12-01block: allocate struct hd_struct as part of struct bdev_inodeChristoph Hellwig3-11/+9
Allocate hd_struct together with struct block_device to pre-load the lifetime rule changes in preparation of merging the two structures. Note that part0 was previously embedded into struct gendisk, but is a separate allocation now, and already points to the block_device instead of the hd_struct. The lifetime of struct gendisk is still controlled by the struct device embedded in the part0 hd_struct. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Jan Kara <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
2020-12-01block: move the policy field to struct block_deviceChristoph Hellwig2-2/+3
Move the policy field to struct block_device and rename it to the more descriptive bd_read_only. Also turn the field into a bool as it is used as such. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Jan Kara <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
2020-12-01block: move make_it_fail to struct block_deviceChristoph Hellwig2-3/+3
Move the make_it_fail flag to struct block_device an turn it into a bool in preparation of killing struct hd_struct. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Jan Kara <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
2020-12-01block: move holder_dir to struct block_deviceChristoph Hellwig2-1/+1
Move the holder_dir field to struct block_device in preparation for kill struct hd_struct. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Jan Kara <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
2020-12-01block: move the partition_meta_info to struct block_deviceChristoph Hellwig2-1/+2
Move the partition_meta_info to struct block_device in preparation for killing struct hd_struct. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Jan Kara <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
2020-12-01block: move the start_sect field to struct block_deviceChristoph Hellwig3-4/+4
Move the start_sect field to struct block_device in preparation of killing struct hd_struct. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Jan Kara <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
2020-12-01block: move disk stat accounting to struct block_deviceChristoph Hellwig3-21/+21
Move the dkstats and stamp field to struct block_device in preparation of killing struct hd_struct. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Jan Kara <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
2020-12-01block: remove the nr_sects field in struct hd_structChristoph Hellwig1-22/+7
Now that the hd_struct always has a block device attached to it, there is no need for having two size field that just get out of sync. Additionally the field in hd_struct did not use proper serialization, possibly allowing for torn writes. By only using the block_device field this problem also gets fixed. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Greg Kroah-Hartman <[email protected]> Reviewed-by: Jan Kara <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Coly Li <[email protected]> [bcache] Acked-by: Chao Yu <[email protected]> [f2fs] Signed-off-by: Jens Axboe <[email protected]>
2020-12-01block: simplify part_to_diskChristoph Hellwig1-7/+3
Now that struct hd_struct has a block_device pointer use that to find the disk. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Jan Kara <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Tejun Heo <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
2020-12-01block: simplify the block device claiming interfaceChristoph Hellwig1-4/+2
Stop passing the whole device as a separate argument given that it can be trivially deducted and cleanup the !holder debug check. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Greg Kroah-Hartman <[email protected]> Reviewed-by: Jan Kara <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Tejun Heo <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
2020-12-01block: remove ->bd_containsChristoph Hellwig1-1/+3
Now that each hd_struct has a reference to the corresponding block_device, there is no need for the bd_contains pointer. Add a bdev_whole() helper to look up the whole device block_device struture instead. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Greg Kroah-Hartman <[email protected]> Reviewed-by: Jan Kara <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Tejun Heo <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
2020-12-01block: simplify bdev/disk lookup in blkdev_getChristoph Hellwig3-5/+12
To simplify block device lookup and a few other upcoming areas, make sure that we always have a struct block_device available for each disk and each partition, and only find existing block devices in bdget. The only downside of this is that each device and partition uses a little more memory. The upside will be that a lot of code can be simplified. With that all we need to look up the block device is to lookup the inode and do a few sanity checks on the gendisk, instead of the separate lookup for the gendisk. For blk-cgroup which wants to access a gendisk without opening it, a new blkdev_{get,put}_no_open low-level interface is added to replace the previous get_gendisk use. Note that the change to look up block device directly instead of the two step lookup using struct gendisk causes a subtile change in behavior: accessing a non-existing partition on an existing block device can now cause a call to request_module. That call is harmless, and in practice no recent system will access these nodes as they aren't created by udev and static /dev/ setups are unusual. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Jan Kara <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
2020-12-01block: remove i_bdevChristoph Hellwig2-2/+1
Switch the block device lookup interfaces to directly work with a dev_t so that struct block_device references are only acquired by the blkdev_get variants (and the blk-cgroup special case). This means that we now don't need an extra reference in the inode and can generally simplify handling of struct block_device to keep the lookups contained in the core block layer code. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Jan Kara <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Tejun Heo <[email protected]> Acked-by: Coly Li <[email protected]> [bcache] Signed-off-by: Jens Axboe <[email protected]>
2020-12-01init: refactor name_to_dev_tChristoph Hellwig1-6/+1
Split each case into a self-contained helper, and move the block dependent code entirely under the pre-existing #ifdef CONFIG_BLOCK. This allows to remove the blk_lookup_devt stub in genhd.h. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Greg Kroah-Hartman <[email protected]> Reviewed-by: Jan Kara <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Reviewed-by: Johannes Thumshirn <[email protected]> Acked-by: Tejun Heo <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
2020-12-01block: add a bdev_kobj helperChristoph Hellwig1-0/+3
Add a little helper to find the kobject for a struct block_device. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Greg Kroah-Hartman <[email protected]> Reviewed-by: Jan Kara <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Reviewed-by: Johannes Thumshirn <[email protected]> Acked-by: Tejun Heo <[email protected]> Acked-by: Coly Li <[email protected]> [bcache] Acked-by: David Sterba <[email protected]> [btrfs] Signed-off-by: Jens Axboe <[email protected]>
2020-12-01block: remove a duplicate __disk_get_part prototypeChristoph Hellwig1-1/+0
Signed-off-by: Christoph Hellwig <[email protected]> Acked-by: Tejun Heo <[email protected]> Reviewed-by: Jan Kara <[email protected]> Reviewed-by: Greg Kroah-Hartman <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Reviewed-by: Johannes Thumshirn <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
2020-12-01fs: simplify freeze_bdev/thaw_bdevChristoph Hellwig2-2/+3
Store the frozen superblock in struct block_device to avoid the awkward interface that can return a sb only used a cookie, an ERR_PTR or NULL. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Jan Kara <[email protected]> Acked-by: Chao Yu <[email protected]> [f2fs] Signed-off-by: Jens Axboe <[email protected]>
2020-12-01fs: remove get_super_thawed and get_super_exclusive_thawedChristoph Hellwig1-3/+1
Just open code the wait in the only caller of both functions. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Jan Kara <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
2020-12-01pstore/blk: remove {un,}register_pstore_blkChristoph Hellwig1-42/+0
This interface is entirely unused, so remove them and various bits of unreachable code. Signed-off-by: Christoph Hellwig <[email protected]> Signed-off-by: Kees Cook <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2020-12-01block: move blk_rq_bio_prep() to linux/blk-mq.hChaitanya Kulkarni1-0/+12
This is a preparation patch to have minimal block layer request bio append functionality in the context of the NVMeOF Passthru driver which falls in the fast path and doesn't need calls from blk_rq_append_bio(). Signed-off-by: Chaitanya Kulkarni <[email protected]> Reviewed-by: Logan Gunthorpe <[email protected]> Signed-off-by: Christoph Hellwig <[email protected]>
2020-12-01net: switch to storing KCOV handle directly in sk_buffMarco Elver1-24/+13
It turns out that usage of skb extensions can cause memory leaks. Ido Schimmel reported: "[...] there are instances that blindly overwrite 'skb->extensions' by invoking skb_copy_header() after __alloc_skb()." Therefore, give up on using skb extensions for KCOV handle, and instead directly store kcov_handle in sk_buff. Fixes: 6370cc3bbd8a ("net: add kcov handle to skb extensions") Fixes: 85ce50d337d1 ("net: kcov: don't select SKB_EXTENSIONS when there is no NET") Fixes: 97f53a08cba1 ("net: linux/skbuff.h: combine SKB_EXTENSIONS + KCOV handling") Link: https://lore.kernel.org/linux-wireless/[email protected]/ Reported-by: Ido Schimmel <[email protected]> Signed-off-by: Marco Elver <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
2020-12-01fpga: fpga-mgr: Add devm_fpga_mgr_register() APIMoritz Fischer1-0/+2
Add a devm_fpga_mgr_register() API that can be used to register a FPGA Manager that was created using devm_fpga_mgr_create(). Introduce a struct fpga_mgr_devres that makes the devres allocation a little bit more readable and gets reused for devm_fpga_mgr_create() devm_fpga_mgr_register(). Reviewed-by: Tom Rix <[email protected]> Signed-off-by: Moritz Fischer <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Greg Kroah-Hartman <[email protected]>
2020-12-01regulator: da9121: Add support for device variants via devicetreeAdam Ward1-0/+11
Add devicetree configuration and device variant parameters. Use the latter to enable the check and use of parameters specific to dual buck variants. Signed-off-by: Adam Ward <[email protected]> Link: https://lore.kernel.org/r/5849ce60595aef1018bdde7dcfb54a7397597545.1606755367.git.Adam.Ward.opensource@diasemi.com Signed-off-by: Mark Brown <[email protected]>
2020-12-01regulator: da9121: Add device variant regmapsAdam Ward1-0/+25
Add ability to probe device and validate configuration, then apply a regmap configuration for a single or dual buck device accordingly. Signed-off-by: Adam Ward <[email protected]> Link: https://lore.kernel.org/r/068c6b8d5e1b4e221e899e4c914c429429a2ec7d.1606755367.git.Adam.Ward.opensource@diasemi.com Signed-off-by: Mark Brown <[email protected]>
2020-12-01arm64: scs: use vmapped IRQ and SDEI shadow stacksSami Tolvanen1-4/+0
Use scs_alloc() to allocate also IRQ and SDEI shadow stacks instead of using statically allocated stacks. Signed-off-by: Sami Tolvanen <[email protected]> Acked-by: Will Deacon <[email protected]> Link: https://lore.kernel.org/r/[email protected] [will: Move CONFIG_SHADOW_CALL_STACK check into init_irq_scs()] Signed-off-by: Will Deacon <[email protected]>
2020-12-01scs: switch to vmapped shadow stacksSami Tolvanen1-6/+6
The kernel currently uses kmem_cache to allocate shadow call stacks, which means an overflows may not be immediately detected and can potentially result in another task's shadow stack to be overwritten. This change switches SCS to use virtually mapped shadow stacks for tasks, which increases shadow stack size to a full page and provides more robust overflow detection, similarly to VMAP_STACK. Signed-off-by: Sami Tolvanen <[email protected]> Acked-by: Will Deacon <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Will Deacon <[email protected]>
2020-12-01init: use type alignment for kernel parametersJohan Hovold1-1/+1
Specify type alignment for kernel parameters instead of sizeof(long). The alignment attribute is used to prevent gcc from increasing the alignment of objects with static extent as an optimisation, something which would mess up the __setup array stride. Using __alignof__(struct obs_kernel_param) rather than sizeof(long) is preferred since it better indicates why it is there and doesn't break should the type size or alignment change. Note that on m68k the alignment of struct obs_kernel_param is actually two and that adding a 1- or 2-byte field to the 12-byte struct would cause a breakage with the current 4-byte alignment. Link: https://lore.kernel.org/lkml/[email protected] Signed-off-by: Johan Hovold <[email protected]> Signed-off-by: Jessica Yu <[email protected]>
2020-12-01net: Introduce preferred busy-pollingBjörn Töpel1-14/+21
The existing busy-polling mode, enabled by the SO_BUSY_POLL socket option or system-wide using the /proc/sys/net/core/busy_read knob, is an opportunistic. That means that if the NAPI context is not scheduled, it will poll it. If, after busy-polling, the budget is exceeded the busy-polling logic will schedule the NAPI onto the regular softirq handling. One implication of the behavior above is that a busy/heavy loaded NAPI context will never enter/allow for busy-polling. Some applications prefer that most NAPI processing would be done by busy-polling. This series adds a new socket option, SO_PREFER_BUSY_POLL, that works in concert with the napi_defer_hard_irqs and gro_flush_timeout knobs. The napi_defer_hard_irqs and gro_flush_timeout knobs were introduced in commit 6f8b12d661d0 ("net: napi: add hard irqs deferral feature"), and allows for a user to defer interrupts to be enabled and instead schedule the NAPI context from a watchdog timer. When a user enables the SO_PREFER_BUSY_POLL, again with the other knobs enabled, and the NAPI context is being processed by a softirq, the softirq NAPI processing will exit early to allow the busy-polling to be performed. If the application stops performing busy-polling via a system call, the watchdog timer defined by gro_flush_timeout will timeout, and regular softirq handling will resume. In summary; Heavy traffic applications that prefer busy-polling over softirq processing should use this option. Example usage: $ echo 2 | sudo tee /sys/class/net/ens785f1/napi_defer_hard_irqs $ echo 200000 | sudo tee /sys/class/net/ens785f1/gro_flush_timeout Note that the timeout should be larger than the userspace processing window, otherwise the watchdog will timeout and fall back to regular softirq processing. Enable the SO_BUSY_POLL/SO_PREFER_BUSY_POLL options on your socket. Signed-off-by: Björn Töpel <[email protected]> Signed-off-by: Daniel Borkmann <[email protected]> Reviewed-by: Jakub Kicinski <[email protected]> Link: https://lore.kernel.org/bpf/[email protected]
2020-11-30NFSD: Add helper for decoding locker4Chuck Lever1-0/+21
Refactor for clarity. Signed-off-by: Chuck Lever <[email protected]>
2020-11-30NFSD: Replace READ* macros in nfsd4_decode_commit()Chuck Lever1-0/+21
Signed-off-by: Chuck Lever <[email protected]>
2020-11-30NFSD: Replace the internals of the READ_BUF() macroChuck Lever1-0/+2
Convert the READ_BUF macro in nfs4xdr.c from open code to instead use the new xdr_stream-style decoders already in use by the encode side (and by the in-kernel NFS client implementation). Once this conversion is done, each individual NFSv4 argument decoder can be independently cleaned up to replace these macros with C code. Signed-off-by: Chuck Lever <[email protected]>
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