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futex: request only one page from get_user_pages()

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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>
This commit is contained in:
Thomas Gleixner 2009-06-25 14:27:58 +02:00
parent 28d0325ce6
commit aa715284b4
1 changed files with 1 additions and 1 deletions
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2
kernel/futex.c
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@ -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;
}