linux-kernel - [PATCH] gfp: GFP_RECLAIM_MASK should include __GFP_NO

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Date:	Wed, 14 Oct 2015 13:36:51 +0800
From:	Pan Xinhui <xinhuix.pan@...el.com>
To:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
CC:	Andrew Morton <akpm@...ux-foundation.org>, vbabka@...e.cz,
	rientjes@...gle.com, hannes@...xchg.org, mhocko@...e.cz,
	nasa4836@...il.com, mgorman@...e.de, alexander.h.duyck@...hat.com,
	aneesh.kumar@...ux.vnet.ibm.com,
	"yanmin_zhang@...ux.intel.com" <yanmin_zhang@...ux.intel.com>
Subject: [PATCH] gfp: GFP_RECLAIM_MASK should include __GFP_NO_KSWAPD

From: Pan Xinhui <xinhuix.pan@...el.com>

GFP_RECLAIM_MASK was introduced in commit 6cb062296f73 ("Categorize GFP
flags"). In slub subsystem, this macro controls slub's allocation
behavior. In particular, some flags which are not in GFP_RECLAIM_MASK
will be cleared. So when slub pass this new gfp_flag into page
allocator, we might lost some very important flags.

There are some mistakes when we introduce __GFP_NO_KSWAPD. This flag is
used to avoid any scheduler-related codes recursive.  But it seems like
patch author forgot to add it into GFP_RECLAIM_MASK. So lets add it now.

Signed-off-by: Pan Xinhui <xinhuix.pan@...el.com>
---
 include/linux/gfp.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index f92cbd2..9ebad4d 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -130,7 +130,8 @@ struct vm_area_struct;
 /* Control page allocator reclaim behavior */
 #define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\
 			__GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\
-			__GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC)
+			__GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC|\
+			__GFP_NO_KSWAPD)
 
 /* Control slab gfp mask during early boot */
 #define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS))
-- 
1.9.1
--
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