On Tue, 15 Jul 2014, Ley Foon Tan wrote:
+static inline int atomic_futex_op_xchg_set(int oparg, u32 __user *uaddr,
> + int *oldval)
> +{
> + unsigned long flags;
> + int ret;
> +
> + local_irq_save(flags);
> +
> + ret = get_user(*oldval, uaddr);
> + if (!ret)
> + ret = put_user(oparg, uaddr);
This is wrong as it gets. get_user() might fault and sleep.
You need a proper implementation, which handles fault exceptions.
Thanks,
tglx
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