linux-kernel - Re: [PATCH] x86: SGU UV Add volatile to macros that access chipset registers

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Message-ID: <20090910022101.GA10038@sgi.com>
Date:	Wed, 9 Sep 2009 21:21:02 -0500
From:	Jack Steiner <steiner@....com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Chris Friesen <cfriesen@...tel.com>,
	Daniel Walker <dwalker@...o99.com>, mingo@...e.hu,
	tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: SGU UV Add volatile to macros that access chipset registers

On Wed, Sep 09, 2009 at 05:44:23PM -0700, H. Peter Anvin wrote:
> On 09/09/2009 12:38 PM, Jack Steiner wrote:
> >  
> >  static inline void uv_write_local_mmr8(unsigned long offset, unsigned char val)
> >  {
> > -	*((unsigned char *)uv_local_mmr_address(offset)) = val;
> > +	*((volatile unsigned char *)uv_local_mmr_address(offset)) = val;
> >  }
> >  
> 
> Why aren't you simply using __writeb() here, and the other memory
> accessors we already have in the other places?

Excellent idea. New patch to follow...


--- jack
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