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authorSean Christopherson <sean.j.christopherson@intel.com>2018-12-28 11:33:28 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-12-28 23:11:46 +0300
commit6a90a83f1d1957647581ca48caa1f7cc4fa44f8d (patch)
tree7a76c7b1232ce57f9d6b429d22ed236d0b503e76 /mm/mmu_notifier.c
parent5eb570a8d9248e0c1358078a59916d0e337e695b (diff)
downloadlinux-6a90a83f1d1957647581ca48caa1f7cc4fa44f8d.tar.xz
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.c7
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