linux-kernel - Re: >Re: [RFC] should VM_BUG_ON(cond) really evaluate cond

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Message-ID: <20111030095918.GA19676@one.firstfloor.org>
Date:	Sun, 30 Oct 2011 10:59:18 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ben Hutchings <bhutchings@...arflare.com>,
	Andi Kleen <andi@...stfloor.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: >Re: [RFC] should VM_BUG_ON(cond) really evaluate cond

> +#define ACCESS_AT_MOST_ONCE(x)			\
> +	({	unsigned long __y;		\

why not typeof here?

> +		asm("":"=r" (__y):"0" (x));	\
> +		(__force __typeof__(x)) __y;	\
> +	})
> +

-Andi
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