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Subject[PATCH 2/2] mm: make it clear that gfp reclaim modifiers are valid only for sleepable allocations
Date
From: Michal Hocko <mhocko@suse.com>

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.

Acked-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Michal Hocko <mhocko@suse.com>
---
include/linux/gfp.h | 2 ++
1 file changed, 2 insertions(+)

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index e3ab1c0d9140..8040fa944cd8 100644
--- a/include/linux/gfp.h
+++ b/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.
*
--
2.25.1
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