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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2008-09-26 19:32:22 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-09-30 12:35:46 +0200 |
| commit | 734b05b10e51d4ba38c8fc3ee02e846aab09eedf (patch) | |
| tree | f9d98cdeb64e2077a77fb8f65b4ab7e331b6fca9 /kernel/futex.c | |
| parent | 61270708ecf1cda148e84fbf6e0703ee5aa81814 (diff) | |
| download | blackbird-op-linux-734b05b10e51d4ba38c8fc3ee02e846aab09eedf.tar.gz blackbird-op-linux-734b05b10e51d4ba38c8fc3ee02e846aab09eedf.zip | |
futex: use fast_gup()
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>
Acked-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/futex.c')
| -rw-r--r-- | kernel/futex.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/kernel/futex.c b/kernel/futex.c index 6a726684217e..facf17d1a705 100644 --- a/kernel/futex.c +++ b/kernel/futex.c @@ -232,9 +232,7 @@ static int get_futex_key(u32 __user *uaddr, struct rw_semaphore *fshared, } 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; |
