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

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Message-ID: <44D55AEC.1090205@zytor.com>
Date:	Sat, 05 Aug 2006 19:58:52 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
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

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.

	-hpa

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