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authorRik van Riel <riel@surriel.com>2021-02-25 17:16:29 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2021-02-26 09:40:59 -0800
commit187df5dde943ae28f260db7377467ffb3b51a6de (patch)
tree3df0c61490e9a16e2d1b957232f5efe1c879aa39
parentcd89fb06509903f942a0ffe97ffa63034671ed0c (diff)
mm,shmem,thp: limit shmem THP allocations to requested zones
Hugh pointed out that the gma500 driver uses shmem pages, but needs to limit them to the DMA32 zone. Ensure the allocations resulting from the gfp_mask returned by limit_gfp_mask use the zone flags that were originally passed to shmem_getpage_gfp. Link: https://lkml.kernel.org/r/20210224121016.1314ed6d@imladris.surriel.com Signed-off-by: Rik van Riel <riel@surriel.com> Suggested-by: Hugh Dickins <hughd@google.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Xu Yu <xuyu@linux.alibaba.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/shmem.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index 06c771d23127..b2db4ed0fbc7 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1513,7 +1513,11 @@ static gfp_t limit_gfp_mask(gfp_t huge_gfp, gfp_t limit_gfp)
{
gfp_t allowflags = __GFP_IO | __GFP_FS | __GFP_RECLAIM;
gfp_t denyflags = __GFP_NOWARN | __GFP_NORETRY;
- gfp_t result = huge_gfp & ~allowflags;
+ gfp_t zoneflags = limit_gfp & GFP_ZONEMASK;
+ gfp_t result = huge_gfp & ~(allowflags | GFP_ZONEMASK);
+
+ /* Allow allocations only from the originally specified zones. */
+ result |= zoneflags;
/*
* Minimize the result gfp by taking the union with the deny flags,