linux-kernel - Re: [PATCH 7/24] consolidate msr.h

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Message-ID: <Pine.LNX.4.58.0711191734270.32296@gandalf.stny.rr.com>
Date:	Mon, 19 Nov 2007 17:36:39 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Bastian Blank <bastian@...di.eu.org>
cc:	Glauber de Oliveira Costa <gcosta@...hat.com>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	glommer@...il.com, tglx@...utronix.de, mingo@...e.hu,
	rusty@...tcorp.com.au, ak@...e.de, chrisw@...s-sol.org,
	avi@...ranet.com, anthony@...emonkey.ws,
	virtualization@...ts.linux-foundation.org, lguest@...abs.org,
	kvm-devel@...ts.sourceforge.net, zach@...are.com,
	jun.nakajima@...el.com
Subject: Re: [PATCH 7/24] consolidate msr.h


On Mon, 19 Nov 2007, Bastian Blank wrote:

> On Fri, Nov 09, 2007 at 04:42:48PM -0200, Glauber de Oliveira Costa wrote:
> > -	wrmsrl(MSR_CSTAR, ia32_cstar_target);
> > +	wrmsrl(MSR_CSTAR, (u64)ia32_cstar_target);
>
> Hmm, why do you add explicit casts? The compiler should convert that
> correctly on its own.
>
> > +static inline void wrmsrl(unsigned int msr, unsigned long long val)
>
> Hmm, long long is 64 bit on all x86, but why not use explicit u64 to
> show that?

(quick reply)

With PVOPS on it gives compiler warnings without that explict cast.
Without looking at the code, IIRC with non-PVOPS it is a macro directly
into asm, so it didn't matter what the cast was. But with PVOPS as a
function, it gave compiler warnings.

Take it out and try compiling it for both i386 and x86_64. One of them
gave warnings. But maybe it's not a problem now.

-- Steve

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