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| author | Andrea Arcangeli <aarcange@redhat.com> | 2015-02-12 02:27:23 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-02-12 04:06:05 +0300 |
| commit | a7b780750e1a1c7833812681e1f8fa30bbb06802 (patch) | |
| tree | e13f7ac217df9904b5cbc1cb624c9f7c9e2130ac /mm/gup.c | |
| parent | 0fd71a56f41d4ffabeda1dae9ff5ed4f34d4e935 (diff) | |
| download | linux-a7b780750e1a1c7833812681e1f8fa30bbb06802.tar.xz | |
mm: gup: use get_user_pages_unlocked within get_user_pages_fast
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>
Diffstat (limited to 'mm/gup.c')
| -rw-r--r-- | mm/gup.c | 6 |
1 files changed, 2 insertions, 4 deletions
@@ -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) { |