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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 <[email protected]>
Reviewed-by: Kirill A. Shutemov <[email protected]>
Cc: Andres Lagar-Cavilla <[email protected]>
Cc: Peter Feiner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andrea Arcangeli 2015-02-11 15:27:23 -08:00 • committed by Linus Torvalds
commit a7b780750e
7 changed files with 16 additions and 33 deletions
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6
mm/gup.c
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@ -1243,10 +1243,8 @@ int get_user_pages_fast(unsigned long start, int nr_pages, int write,
start += nr << PAGE_SHIFT;
pages += nr;
down_read(&mm->mmap_sem);
ret = get_user_pages(current, mm, start,
nr_pages - nr, write, 0, pages, NULL);
up_read(&mm->mmap_sem);
ret = get_user_pages_unlocked(current, mm, start,
nr_pages - nr, write, 0, pages);
/* Have to be a bit careful with return values */
if (nr > 0) {