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

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Date:	Thu, 05 Feb 2009 15:31:17 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Ingo Molnar <mingo@...e.hu>,
	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

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 //

Thanks.

-- 
tejun
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