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Commit 0157fbd7 authored by Liam Mark's avatar Liam Mark Committed by Swathi Sridhar
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mm: Allow only __GFP_CMA allocations from Movable zone 



Ensure that only allocations which include __GFP_CMA can be satisfied from
zone Movable. This restriction helps reduces the likelihood of a page in
the movable zone being pinned which would prevent memory from being
offlined.

Change-Id: I570970ff848d4a7147f3ccda2b294f08bcdf88d8
Signed-off-by: default avatarLiam Mark <lmark@codeaurora.org>
parent c609d5c0

include/linux/gfp.h

+8 −1
Original line number Diff line number Diff line
@@ -420,7 +420,14 @@ static inline bool gfpflags_allow_blocking(const gfp_t gfp_flags) 
static inline enum zone_type gfp_zone(gfp_t flags)

{

	enum zone_type z;

	int bit = (__force int) (flags & GFP_ZONEMASK);

	int bit;



	if (!IS_ENABLED(CONFIG_HIGHMEM)) {

		if ((flags & __GFP_MOVABLE) && !(flags & __GFP_CMA))

			flags &= ~__GFP_HIGHMEM;

	}



	bit = (__force int) (flags & GFP_ZONEMASK);



	z = (GFP_ZONE_TABLE >> (bit * GFP_ZONES_SHIFT)) &

					 ((1 << GFP_ZONES_SHIFT) - 1);