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| author | Sean Christopherson <sean.j.christopherson@intel.com> | 2018-12-28 00:33:28 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-12-28 12:11:46 -0800 |
| commit | 6a90a83f1d1957647581ca48caa1f7cc4fa44f8d (patch) | |
| tree | 7a76c7b1232ce57f9d6b429d22ed236d0b503e76 /mm/mmu_notifier.c | |
| parent | 5eb570a8d9248e0c1358078a59916d0e337e695b (diff) | |
| download | lwn-6a90a83f1d1957647581ca48caa1f7cc4fa44f8d.tar.gz lwn-6a90a83f1d1957647581ca48caa1f7cc4fa44f8d.zip | |
mm/mmu_notifier.c: remove mmu_notifier_synchronize()
Contrary to its name, mmu_notifier_synchronize() does not synchronize the
notifier's SRCU instance, but rather waits for RCU callbacks to finish.
i.e. it invokes rcu_barrier(). The RCU documentation is quite clear on
this matter, explicitly calling out that rcu_barrier() does not imply
synchronize_rcu().
As there are no callers of mmu_notifier_synchronize() and it's unclear
whether any user of mmu_notifier_call_srcu() will ever want to barrier on
their callbacks, simply remove the function.
Link: http://lkml.kernel.org/r/20181106134705.14197-1-sean.j.christopherson@intel.com
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Jérôme Glisse <jglisse@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mmu_notifier.c')
| -rw-r--r-- | mm/mmu_notifier.c | 7 |
1 files changed, 0 insertions, 7 deletions
diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c index 5119ff846769..755466cd289a 100644 --- a/mm/mmu_notifier.c +++ b/mm/mmu_notifier.c @@ -35,13 +35,6 @@ void mmu_notifier_call_srcu(struct rcu_head *rcu, } EXPORT_SYMBOL_GPL(mmu_notifier_call_srcu); -void mmu_notifier_synchronize(void) -{ - /* Wait for any running method to finish. */ - srcu_barrier(&srcu); -} -EXPORT_SYMBOL_GPL(mmu_notifier_synchronize); - /* * This function can't run concurrently against mmu_notifier_register * because mm->mm_users > 0 during mmu_notifier_register and exit_mmap |