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linux-next/ipc
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Manfred Spraul 8116b54e7e ipc/sem.c: document and update memory barriers 
Document and update the memory barriers in ipc/sem.c:

- Add smp_store_release() to wake_up_sem_queue_prepare() and
  document why it is needed.

- Read q->status using READ_ONCE+smp_acquire__after_ctrl_dep().
  as the pair for the barrier inside wake_up_sem_queue_prepare().

- Add comments to all barriers, and mention the rules in the block
  regarding locking.

- Switch to using wake_q_add_safe().

Link: http://lkml.kernel.org/r/20191020123305.14715-6-manfred@colorfullife.com
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Cc: Waiman Long <longman@redhat.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: <1vier1@web.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-02-04 03:05:24 +00:00
..
compat.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ipc_sysctl.c proc/sysctl: add shared variables for range check 2019-07-18 17:08:07 -07:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mq_sysctl.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441 2019-06-05 17:37:17 +02:00
mqueue.c ipc/mqueue.c: update/document memory barriers 2020-02-04 03:05:23 +00:00
msg.c ipc/msg.c: update and document memory barriers 2020-02-04 03:05:24 +00:00
msgutil.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 52 2019-05-24 17:36:42 +02:00
namespace.c ipc: Convert mqueue fs to fs_context 2019-02-28 03:29:29 -05:00
sem.c ipc/sem.c: document and update memory barriers 2020-02-04 03:05:24 +00:00
shm.c ipc: rename old-style shmctl/semctl/msgctl syscalls 2019-01-25 17:22:50 +01:00
syscall.c y2038: remove CONFIG_64BIT_TIME 2019-11-15 14:38:27 +01:00
util.c treewide: Use sizeof_field() macro 2019-12-09 10:36:44 -08:00
util.h ipc: fix sparc64 ipc() wrapper 2019-09-07 21:42:25 +02:00