| commit | 0d97a82ba830d89a1e541cc9cd11f1e38c28e416 | [log] [tgz] |
|---|---|---|
| author | Manfred Spraul <[email protected]> | Mon Feb 03 17:34:39 2020 -0800 |
| committer | Linus Torvalds <[email protected]> | Tue Feb 04 03:05:24 2020 +0000 |
| tree | c1b3744d565e32553c64dd6d6fba604b14afeba6 | |
| parent | c5b2cbdbdac563f46ecd5e187253ab1abbd6fc04 [diff] |
ipc/msg.c: update and document memory barriers Transfer findings from ipc/mqueue.c: - A control barrier was missing for the lockless receive case So in theory, not yet initialized data may have been copied to user space - obviously only for architectures where control barriers are not NOP. - use smp_store_release(). In theory, the refount may have been decreased to 0 already when wake_q_add() tries to get a reference. Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Manfred Spraul <[email protected]> Cc: Waiman Long <[email protected]> Cc: Davidlohr Bueso <[email protected]> Cc: <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Will Deacon <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>