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mm: gup: use get_user_pages_unlocked within get_user_pages_fast

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This allows the get_user_pages_fast slow path to release the mmap_sem
before blocking.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Reviewed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andres Lagar-Cavilla <andreslc@google.com>
Cc: Peter Feiner <pfeiner@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrea Arcangeli
2015-02-11 15:27:23 -08:00
committed by Linus Torvalds
parent 0fd71a56f4
commit a7b780750e
7 changed files with 16 additions and 33 deletions
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8
arch/mips/mm/gup.c
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@@ -301,11 +301,9 @@ slow_irqon:
start += nr << PAGE_SHIFT;
pages += nr;
down_read(&mm->mmap_sem);
ret = get_user_pages(current, mm, start,
(end - start) >> PAGE_SHIFT,
write, 0, pages, NULL);
up_read(&mm->mmap_sem);
ret = get_user_pages_unlocked(current, mm, start,
(end - start) >> PAGE_SHIFT,
write, 0, pages);
/* Have to be a bit careful with return values */
if (nr > 0) {