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mm: fix the use of ALLOC_CMA

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Movable allocations are allowed to allocate from CMA areas
only when __GFP_CMA is set in the gfp mask of the request.
But ALLOC_CMA is set in alloc_flags for all movable requests.
This can make zone_watermark_ok take incorrect decision.
Fix this by adding ALLOC_CMA only when request is of type
__GFP_CMA.

Change-Id: I15531968021c71cfbedd01d12307a203f0b408ca
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
This commit is contained in:
Vinayak Menon 2018-08-16 14:22:24 +05:30 • committed by Isaac J. Manjarres
commit 3f23e82084
1 changed files with 4 additions and 2 deletions
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6
mm/page_alloc.c
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@ -4313,7 +4313,8 @@ gfp_to_alloc_flags(gfp_t gfp_mask)
alloc_flags |= ALLOC_KSWAPD;
#ifdef CONFIG_CMA
if (gfpflags_to_migratetype(gfp_mask) == MIGRATE_MOVABLE)
if ((gfpflags_to_migratetype(gfp_mask) == MIGRATE_MOVABLE) &&
(gfp_mask & __GFP_CMA))
alloc_flags |= ALLOC_CMA;
#endif
return alloc_flags;
@ -4795,7 +4796,8 @@ static inline bool prepare_alloc_pages(gfp_t gfp_mask, unsigned int order,
if (should_fail_alloc_page(gfp_mask, order))
return false;
if (IS_ENABLED(CONFIG_CMA) && ac->migratetype == MIGRATE_MOVABLE)
if (IS_ENABLED(CONFIG_CMA) && ac->migratetype == MIGRATE_MOVABLE &&
(gfp_mask & __GFP_CMA))
*alloc_flags |= ALLOC_CMA;
return true;