linux-kernel - Re: [PATCH 2/3] xen: make direct versions of irq_enable/disable/save/restore to common code

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Message-ID: <20090205150028.GD23903@elte.hu>
Date:	Thu, 5 Feb 2009 16:00:28 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Tejun Heo <htejun@...il.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Brian Gerst <brgerst@...il.com>,
	Xen-devel <xen-devel@...ts.xensource.com>
Subject: Re: [PATCH 2/3] xen: make direct versions of
	irq_enable/disable/save/restore to common code


* Tejun Heo <htejun@...il.com> wrote:

> Hello,
> 
> Jeremy Fitzhardinge wrote:
> > Now that x86-64 has directly accessible percpu variables, it can also
> > implement the direct versions of these operations, which operate on a
> > vcpu_info structure directly embedded in the percpu area.
> > 
> > In fact, the 64-bit versions are more or less identical, and so can be
> > shared.  The only two differences are:
> > 1. xen_restore_fl_direct takes its argument in eax on 32-bit, and rdi on
> > 64-bit.
> >    Unfortunately it isn't possible to directly refer to the 2nd lsb of
> > rdi directly
> >    (as you can with %ah), so the code isn't quite as dense.
> > 2. check_events needs to variants to save different registers.
> > 
> > Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> > ---
> > arch/x86/xen/Makefile     |    3 arch/x86/xen/xen-asm.S    |  140
> > +++++++++++++++++++++++++++++++++++++++++++++
> > arch/x86/xen/xen-asm.h    |   12 +++
> > arch/x86/xen/xen-asm_32.S |  113 ++++--------------------------------
> > arch/x86/xen/xen-asm_64.S |  136
> > +------------------------------------------
> > 5 files changed, 171 insertions(+), 233 deletions(-)
> ...
> > ===================================================================
> > --- a/arch/x86/xen/xen-asm_32.S
> > +++ b/arch/x86/xen/xen-asm_32.S
> > @@ -11,101 +11,28 @@
> >     generally too large to inline anyway.
> >  */
> > 
> > -#include <linux/linkage.h>
> > -
> > -#include <asm/asm-offsets.h>
> > +//#include <asm/asm-offsets.h>
> 
> Applied without the above addition of //

btw., that's still worth fixing, plus the comments styles could be 
standardized. And this should grow an extra space after the comma:

        lea 4(%edi),%esp                /* point esp to new frame */

(there's 5-6 similar instructions in that file with this problem - the rest 
is fine.)

	Ingo
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