linux-kernel - Re: [PATCH 2/2]: atomic_t: Remove volatile from atomic

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Message-ID: <20100517201339.GJ20356@shareable.org>
Date:	Mon, 17 May 2010 21:13:39 +0100
From:	Jamie Lokier <jamie@...reable.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Anton Blanchard <anton@...ba.org>, akpm@...ux-foundation.org,
	willy@...ux.intel.com, benh@...nel.crashing.org, paulus@...ba.org,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2]: atomic_t: Remove volatile from atomic_t definition

Linus Torvalds wrote:
> 
> 
> On Mon, 17 May 2010, Anton Blanchard wrote:
> > 
> > It turns out this bad code is a result of us defining atomic_t as a
> > volatile int.
> 
> Heh. Ok, as you point out in the commit message, I obviously agree with 
> this patch. "volatile" on data is evil, with the possible exception of 
> "jiffies" type things.

I wonder if

   extern unsigned long __nv_jiffies;
   #define jiffies (*(volatile unsigned long *)*__nv_jiffies)

would improve any code in the same way as this atomic_t change.

-- Jamie
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