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authorThomas Gleixner <tglx@linutronix.de>2009-06-25 14:27:58 +0200
committerThomas Gleixner <tglx@linutronix.de>2009-06-25 14:33:46 +0200
commitaa715284b4d28cabde6c25c568d769a6be712bc8 (patch)
treec308ab1cdf8d0d7b6b1a01a1a233183670d62f9f
parent28d0325ce6e0a52f53d8af687e6427fee59004d3 (diff)
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>
-rw-r--r--kernel/futex.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/futex.c b/kernel/futex.c
index 1c337112335..794c862125f 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;
}