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| author |   Thomas Gleixner <tglx@linutronix.de> | 2009-06-25 14:27:58 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2009-06-25 14:33:46 +0200 |
| commit | aa715284b4d28cabde6c25c568d769a6be712bc8 (patch) | |
| tree | c308ab1cdf8d0d7b6b1a01a1a233183670d62f9f /kernel/futex.c | |
| parent | Linux 2.6.31-rc1 (diff) | |
| download | linux-dev-aa715284b4d28cabde6c25c568d769a6be712bc8.tar.xz linux-dev-aa715284b4d28cabde6c25c568d769a6be712bc8.zip | |
futex: request only one page from get_user_pages()
Yanmin noticed that fault_in_user_writeable() requests 4 pages instead
of one.
That's the result of blindly trusting Linus' proposal :) I even looked
up the prototype to verify the correctness: the argument in question
is confusingly enough named "len" while in reality it means number of
pages.
Pointed-out-by: Yanmin Zhang <yanmin_zhang@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/futex.c')
| -rw-r--r-- | kernel/futex.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/futex.c b/kernel/futex.c index 1c337112335c..794c862125fe 100644 --- a/kernel/futex.c +++ b/kernel/futex.c @@ -299,7 +299,7 @@ void put_futex_key(int fshared, union futex_key *key) static int fault_in_user_writeable(u32 __user *uaddr) { int ret = get_user_pages(current, current->mm, (unsigned long)uaddr, - sizeof(*uaddr), 1, 0, NULL, NULL); + 1, 1, 0, NULL, NULL); return ret < 0 ? ret : 0; } |