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From: Denys Vlasenko <vda.linux@googlemail.com>
To: "Glauber de Oliveira Costa" <glommer@gmail.com>
Cc: "Avi Kivity" <avi@qumranet.com>,
	"Glauber de Oliveira Costa" <gcosta@redhat.com>,
	linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
	tglx@linutronix.de, mingo@elte.hu, ehabkost@redhat.com,
	jeremy@goop.org, anthony@codemonkey.ws,
	virtualization@lists.linux-foundation.org, rusty@rustcorp.com.au,
	ak@suse.de, chrisw@sous-sol.org, rostedt@goodmis.org,
	hpa@zytor.com
Subject: Re: [PATCH 4/8] unify paravirt parts of system.h
Date: Tue, 4 Dec 2007 14:14:13 -0800
Message-ID: <200712041414.14159.vda.linux@googlemail.com> (raw)
In-Reply-To: <5d6222a80712041141p5fbc0c0ei68696f054cc8a303@mail.gmail.com>

On Tuesday 04 December 2007 11:41, Glauber de Oliveira Costa wrote:
> On Dec 4, 2007 5:18 PM, Avi Kivity <avi@qumranet.com> wrote:
> > There is no cr8 register on i386.  This had better be protected by an
> > #ifdef.
>
> Sure. I mentioned it in the changelog. I, however, am not sure If I
> agree it should be enclosed
> in ifdefs. Me and Jeremy discussed it a while ago, and we seem to
> agree that for those functions
> that are exclusive of one architecture, there were no need for ifdefs.
> Any usage by the other arch
> is a bug.
>
> But I admit that I'm not particularly biased here, and I can change
> it, if there's agreement that
> an ifdef here is the way to go.
>
> > (you're likely not getting an error since it's a static inline, so the
> > asm is never emitted)
>
> Which also means it does not affect the binary in anyway. No bigger
> code, no nothing.

If future changes will mistakenly make 32-bit x86 call native_read_cr8(),
you will get no warning. (Hmmm. Maybe as will complain, I'm not sure).
If it explicitly ifdefed out for 32 bits, it's easier to detect misuse.
--
vda

      reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-12-04 16:06 [PATCH 0/8] Integrate system.h Glauber de Oliveira Costa
2007-12-04 16:06 ` [PATCH 1/8] remove volatile keyword from clflush Glauber de Oliveira Costa
2007-12-04 16:06   ` [PATCH 2/8] put together equal pieces of system.h Glauber de Oliveira Costa
2007-12-04 16:06     ` [PATCH 3/8] unify load_segment macro Glauber de Oliveira Costa
2007-12-04 16:06       ` [PATCH 4/8] unify paravirt parts of system.h Glauber de Oliveira Costa
2007-12-04 16:06         ` [PATCH 5/8] remove unused macro Glauber de Oliveira Costa
2007-12-04 16:06           ` [PATCH 6/8] unify smp parts of system.h Glauber de Oliveira Costa
2007-12-04 16:06             ` [PATCH 7/8] move switch_to macro to system.h Glauber de Oliveira Costa
2007-12-04 16:06               ` [PATCH 8/8] unify system.h Glauber de Oliveira Costa
2007-12-04 19:18         ` [PATCH 4/8] unify paravirt parts of system.h Avi Kivity
2007-12-04 19:34           ` Andi Kleen
2007-12-05 16:30             ` Pavel Machek
2007-12-15 13:17               ` Ingo Molnar
2007-12-17  0:27                 ` Rafael J. Wysocki
2007-12-17  0:23                   ` Pavel Machek
2007-12-17  0:58                     ` Rafael J. Wysocki
2007-12-15 13:26               ` Andi Kleen
2007-12-15 22:54                 ` Pavel Machek
2007-12-15 20:28               ` H. Peter Anvin
2007-12-04 19:41           ` Glauber de Oliveira Costa
2007-12-04 22:14             ` Denys Vlasenko [this message]

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