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| author | Manfred Spraul <manfred@colorfullife.com> | 2019-12-04 10:02:48 +1100 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2019-12-04 10:02:48 +1100 |
| commit | e2cbe073b2429aedb4d8f0bc2f08527c13d37b52 (patch) | |
| tree | 38a1b15a46ad74777d3cca79a8d0e9faf3633f05 /arch/arm64/boot/dts/renesas/r8a774c0.dtsi | |
| parent | 1141749e1c7df4e706d669e29f764a407168db6e (diff) | |
| download | linux-next-e2cbe073b2429aedb4d8f0bc2f08527c13d37b52.tar.gz | |
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: Stephen Rothwell <sfr@canb.auug.org.au>
Diffstat (limited to 'arch/arm64/boot/dts/renesas/r8a774c0.dtsi')
0 files changed, 0 insertions, 0 deletions