diff options
| author | Mathieu Desnoyers <[email protected]> | 2019-09-19 13:37:00 -0400 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2019-09-25 17:42:30 +0200 |
| commit | 09554009c0cad4cb2223dd943c813c9257c6883a (patch) | |
| tree | e66d1a7c79665dff8a7846f837402d2fa4a74eb3 | |
| parent | fc0d77387cb5ae883fd774fc559e056a8dde024c (diff) | |
sched/membarrier: Remove redundant check
Checking that the number of threads is 1 is redundant with checking
mm_users == 1.
No change in functionality intended.
Suggested-by: Oleg Nesterov <[email protected]>
Signed-off-by: Mathieu Desnoyers <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Chris Metcalf <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Eric W. Biederman <[email protected]>
Cc: Kirill Tkhai <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Russell King - ARM Linux admin <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
| -rw-r--r-- | kernel/sched/membarrier.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/sched/membarrier.c b/kernel/sched/membarrier.c index d48b95fc4026..7ccbd0e19626 100644 --- a/kernel/sched/membarrier.c +++ b/kernel/sched/membarrier.c @@ -186,7 +186,7 @@ static int membarrier_register_global_expedited(void) MEMBARRIER_STATE_GLOBAL_EXPEDITED_READY) return 0; atomic_or(MEMBARRIER_STATE_GLOBAL_EXPEDITED, &mm->membarrier_state); - if (atomic_read(&mm->mm_users) == 1 && get_nr_threads(p) == 1) { + if (atomic_read(&mm->mm_users) == 1) { /* * For single mm user, single threaded process, we can * simply issue a memory barrier after setting @@ -232,7 +232,7 @@ static int membarrier_register_private_expedited(int flags) if (flags & MEMBARRIER_FLAG_SYNC_CORE) atomic_or(MEMBARRIER_STATE_PRIVATE_EXPEDITED_SYNC_CORE, &mm->membarrier_state); - if (!(atomic_read(&mm->mm_users) == 1 && get_nr_threads(p) == 1)) { + if (atomic_read(&mm->mm_users) != 1) { /* * Ensure all future scheduler executions will observe the * new thread flag state for this process. |