diff options
| author | Michal Hocko <[email protected]> | 2018-10-26 15:03:35 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2018-10-26 16:25:19 -0700 |
| commit | 33490af3f5c15757448b6c454ca93b48a333aa1b (patch) | |
| tree | e09188b5cab974b02ac9634c0f11754c6545319b | |
| parent | 15f570bf3d13aa94a97234538a5110d18df03aa3 (diff) | |
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/[email protected]
Signed-off-by: Michal Hocko <[email protected]>
Reviewed-by: Jerome Glisse <[email protected]>
Cc: Boris Ostrovsky <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Juergen Gross <[email protected]>
Cc: Tetsuo Handa <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
| -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, |