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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 /include/linux/mmu_notifier.h | |
| parent | mm/hotplug: optimize clear_hwpoisoned_pages() (diff) | |
| download | wireguard-linux-6a90a83f1d1957647581ca48caa1f7cc4fa44f8d.tar.xz wireguard-linux-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 'include/linux/mmu_notifier.h')
| -rw-r--r-- | include/linux/mmu_notifier.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h index 9893a6432adf..913c3c13e36e 100644 --- a/include/linux/mmu_notifier.h +++ b/include/linux/mmu_notifier.h @@ -420,7 +420,6 @@ static inline void mmu_notifier_mm_destroy(struct mm_struct *mm) extern void mmu_notifier_call_srcu(struct rcu_head *rcu, void (*func)(struct rcu_head *rcu)); -extern void mmu_notifier_synchronize(void); #else /* CONFIG_MMU_NOTIFIER */ |