diff options
| author |   Michal Hocko <mhocko@suse.com> | 2018-10-26 15:03:35 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2018-10-26 16:25:19 -0700 |
| commit | 33490af3f5c15757448b6c454ca93b48a333aa1b (patch) | |
| tree | e09188b5cab974b02ac9634c0f11754c6545319b /include/linux/mmu_notifier.h | |
| parent | mm,page_alloc: PF_WQ_WORKER threads must sleep at should_reclaim_retry() (diff) | |
| download | wireguard-linux-33490af3f5c15757448b6c454ca93b48a333aa1b.tar.xz wireguard-linux-33490af3f5c15757448b6c454ca93b48a333aa1b.zip | |
mm, mmu_notifier: be explicit about range invalition non-blocking mode
If invalidate_range_start() is called for !blocking mode then all
callbacks have to guarantee they will no block/sleep. The same obviously
applies to invalidate_range_end because this operation pairs with the
former and they are called from the same context. Make sure this is
appropriately documented.
Link: http://lkml.kernel.org/r/20180827112623.8992-3-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
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 | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h index 133ba78820ee..698e371aafe3 100644 --- a/include/linux/mmu_notifier.h +++ b/include/linux/mmu_notifier.h @@ -153,7 +153,9 @@ struct mmu_notifier_ops { * * If blockable argument is set to false then the callback cannot * sleep and has to return with -EAGAIN. 0 should be returned - * otherwise. + * otherwise. Please note that if invalidate_range_start approves + * a non-blocking behavior then the same applies to + * invalidate_range_end. * */ int (*invalidate_range_start)(struct mmu_notifier *mn, |