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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>
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@ -299,7 +299,7 @@ void put_futex_key(int fshared, union futex_key *key)
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static int fault_in_user_writeable(u32 __user *uaddr)
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static int fault_in_user_writeable(u32 __user *uaddr)
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{
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{
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int ret = get_user_pages(current, current->mm, (unsigned long)uaddr,
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int ret = get_user_pages(current, current->mm, (unsigned long)uaddr,
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sizeof(*uaddr), 1, 0, NULL, NULL);
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1, 1, 0, NULL, NULL);
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return ret < 0 ? ret : 0;
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return ret < 0 ? ret : 0;
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}
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}
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