linux-kernel - Re: [PATCH][RFC] unbreak generic futex_atomic_cmpxchg

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Date:	Thu, 2 Aug 2007 01:49:02 +0200
From:	Lennert Buytenhek <buytenh@...tstofly.org>
To:	Mikael Pettersson <mikpe@...uu.se>
Cc:	linux-kernel@...r.kernel.org, mingo@...hat.com,
	rmk@....linux.org.uk, tglx@...utronix.de
Subject: Re: [PATCH][RFC] unbreak generic futex_atomic_cmpxchg_inatomic() on UP

On Thu, Aug 02, 2007 at 01:00:21AM +0200, Mikael Pettersson wrote:

> @@ -52,7 +53,34 @@ futex_atomic_op_inuser (int encoded_op, 
>  static inline int
>  futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
>  {
> +#ifdef CONFIG_SMP
>  	return -ENOSYS;
> +#else

Since the callers of futex_atomic_cmpxchg_inatomic() don't really
seem prepared to deal with -ENOSYS (e.g. the handle_futex_death()
infinite loop when it gets -ENOSYS), it seems better never to
return -ENOSYS from this function at all.

What if you just stick an #error in here in the SMP case?
-
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