diff options
| author | Haggai Eran <haggaie@mellanox.com> | 2012-10-09 03:33:35 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-10-09 11:22:58 +0400 |
| commit | 6bdb913f0a70a4dfb7f066fb15e2d6f960701d00 (patch) | |
| tree | 9a61960b27bf801794104b8bb8fccee1813f1b4b /mm/mmu_notifier.c | |
| parent | 2ec74c3ef2d8c58d71e0e00336fb6b891192155a (diff) | |
| download | linux-6bdb913f0a70a4dfb7f066fb15e2d6f960701d00.tar.xz | |
mm: wrap calls to set_pte_at_notify with invalidate_range_start and invalidate_range_end
In order to allow sleeping during invalidate_page mmu notifier calls, we
need to avoid calling when holding the PT lock. In addition to its direct
calls, invalidate_page can also be called as a substitute for a change_pte
call, in case the notifier client hasn't implemented change_pte.
This patch drops the invalidate_page call from change_pte, and instead
wraps all calls to change_pte with invalidate_range_start and
invalidate_range_end calls.
Note that change_pte still cannot sleep after this patch, and that clients
implementing change_pte should not take action on it in case the number of
outstanding invalidate_range_start calls is larger than one, otherwise
they might miss a later invalidation.
Signed-off-by: Haggai Eran <haggaie@mellanox.com>
Cc: Andrea Arcangeli <andrea@qumranet.com>
Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Cc: Or Gerlitz <ogerlitz@mellanox.com>
Cc: Haggai Eran <haggaie@mellanox.com>
Cc: Shachar Raindel <raindel@mellanox.com>
Cc: Liran Liss <liranl@mellanox.com>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Avi Kivity <avi@redhat.com>
Cc: Hugh Dickins <hughd@google.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 | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c index c297142f0fe6..479a1e751a73 100644 --- a/mm/mmu_notifier.c +++ b/mm/mmu_notifier.c @@ -137,12 +137,6 @@ void __mmu_notifier_change_pte(struct mm_struct *mm, unsigned long address, hlist_for_each_entry_rcu(mn, n, &mm->mmu_notifier_mm->list, hlist) { if (mn->ops->change_pte) mn->ops->change_pte(mn, mm, address, pte); - /* - * Some drivers don't have change_pte, - * so we must call invalidate_page in that case. - */ - else if (mn->ops->invalidate_page) - mn->ops->invalidate_page(mn, mm, address); } srcu_read_unlock(&srcu, id); } |