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sched/membarrier: Remove redundant check

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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]>
This commit is contained in:
Mathieu Desnoyers 2019-09-19 13:37:00 -04:00 • committed by Ingo Molnar
commit 09554009c0
1 changed files with 2 additions and 2 deletions
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4
kernel/sched/membarrier.c
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@ -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.