Messages in this thread Patch in this message | | | Date | Fri, 26 Sep 2008 19:32:22 +0200 | From | Peter Zijlstra <> | Subject | [PATCH 3/4] futex: use fast_gup() |
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Change the get_user_pages() call with fast_gup() which doesn't require holding the mmap_sem thereby removing the mmap_sem from all fast paths.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> --- kernel/futex.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)
Index: linux-2.6/kernel/futex.c =================================================================== --- linux-2.6.orig/kernel/futex.c +++ linux-2.6/kernel/futex.c @@ -232,9 +232,7 @@ static int get_futex_key(u32 __user *uad } again: - down_read(&mm->mmap_sem); - err = get_user_pages(current, mm, address, 1, 0, 0, &page, NULL); - up_read(&mm->mmap_sem); + err = get_user_pages_fast(address, 1, 0, &page); if (err < 0) return err;
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