diff options
| author | Christoph Hellwig <hch@lst.de> | 2019-07-11 20:57:32 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-07-12 11:05:45 -0700 |
| commit | 01a369160bbea43727aa2b99877f86ebddba9acc (patch) | |
| tree | c82f89f95c98030ec3190a887e166040867081b5 | |
| parent | cbd34da7dc9afd521e0bea5e7d12701f4a9da7c7 (diff) | |
| download | linux-01a369160bbea43727aa2b99877f86ebddba9acc.tar.gz | |
mm: switch gup_hugepte to use try_get_compound_head
This applies the overflow fixes from 8fde12ca79aff ("mm: prevent
get_user_pages() from overflowing page refcount") to the powerpc hugepd
code and brings it back in sync with the other GUP cases.
Link: http://lkml.kernel.org/r/20190625143715.1689-16-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: David Miller <davem@davemloft.net>
Cc: James Hogan <jhogan@kernel.org>
Cc: Jason Gunthorpe <jgg@mellanox.com>
Cc: Khalid Aziz <khalid.aziz@oracle.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Paul Burton <paul.burton@mips.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Rich Felker <dalias@libc.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/gup.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/gup.c b/mm/gup.c index 2f8bf7a71c74..7763abd16405 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -2006,7 +2006,8 @@ static int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr, refs++; } while (addr += PAGE_SIZE, addr != end); - if (!page_cache_add_speculative(head, refs)) { + head = try_get_compound_head(head, refs); + if (!head) { *nr -= refs; return 0; } |