linux-kernel - Re: [PATCH] Turn rdmsr, rdtsc into inline functions, clarify names

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Message-Id: <1154833800.29151.24.camel@localhost.localdomain>
Date:	Sun, 06 Aug 2006 13:09:59 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andi Kleen <ak@....de>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Turn rdmsr, rdtsc into inline functions, clarify names

On Sat, 2006-08-05 at 19:58 -0700, H. Peter Anvin wrote:
> Rusty Russell wrote:
> > 
> > You mean the l and ll variants?  The 64 bit variants are rdmsrl and
> > rdtscll, not to be confused with rdtscl, which returns the lower 32
> > bits.  This confusion caused the x86_64 bug in gameport.c which the
> > patch comment mentioned (at least, seems to be a bug to me).
> > 
> > See why I want to fix these names?
> > 
> > So if you would prefer u64 rdtsc64(), u32 rdtsc_low(), u64 rdmsr64(int
> > msr), u32 rdmsr_low(int msr), I can convert everyone to that, although
> > it's a more invasive change...
> 
> rdmsrl is really misnamed.  It should have been rdmsrq to be consistent, 
> and have rdmsrl return the low 32 bits.

I prefer the more explicit linux-style naming of rdmsr_low32/rdmsr64,
myself, even though this is x86-specific code.  Noone has an excuse for
misunderstanding then...

Thanks!
Rusty.
-- 
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