The patch titled
Subject: mm: make it clear that gfp reclaim modifiers are valid only for sleepable allocations
has been added to the -mm tree. Its filename is
mm-make-it-clear-that-gfp-reclaim-modifiers-are-valid-only-for-sleepable-allocations.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-make-it-clear-that-gfp-reclaim-modifiers-are-valid-only-for-sleepable-allocations.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-make-it-clear-that-gfp-reclaim-modifiers-are-valid-only-for-sleepable-allocations.patch
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------------------------------------------------------
From: Michal Hocko <mhocko@xxxxxxxx>
Subject: mm: make it clear that gfp reclaim modifiers are valid only for sleepable allocations
While it might be really clear to MM developers that gfp reclaim modifiers
are applicable only to sleepable allocations (those with
__GFP_DIRECT_RECLAIM) it seems that actual users of the API are not always
sure. Make it explicit that they are not applicable for GFP_NOWAIT or
GFP_ATOMIC allocations which are the most commonly used non-sleepable
allocation masks.
Link: http://lkml.kernel.org/r/20200403083543.11552-3-mhocko@xxxxxxxxxx
Acked-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Joel Fernandes <joel@xxxxxxxxxxxxxxxxx>
Cc: Neil Brown <neilb@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/gfp.h | 2 ++
1 file changed, 2 insertions(+)
--- a/include/linux/gfp.h~mm-make-it-clear-that-gfp-reclaim-modifiers-are-valid-only-for-sleepable-allocations
+++ a/include/linux/gfp.h
@@ -127,6 +127,8 @@ struct vm_area_struct;
*
* Reclaim modifiers
* ~~~~~~~~~~~~~~~~~
+ * Please note that all the following flags are only applicable to sleepable
+ * allocations (e.g. %GFP_NOWAIT and %GFP_ATOMIC will ignore them).
*
* %__GFP_IO can start physical IO.
*
_
Patches currently in -mm which might be from mhocko@xxxxxxxx are
mm-clarify-__gfp_memalloc-usage.patch
mm-make-it-clear-that-gfp-reclaim-modifiers-are-valid-only-for-sleepable-allocations.patch
