linux-kernel - Re: [patch 12/26] Xen-paravirt_ops: Fix patch site clobbers to include return register

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Message-ID: <45E7738D.5090607@vmware.com>
Date:	Thu, 01 Mar 2007 16:45:01 -0800
From:	Zachary Amsden <zach@...are.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Andi Kleen <ak@....de>, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, virtualization@...ts.osdl.org,
	xen-devel@...ts.xensource.com, Chris Wright <chrisw@...s-sol.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [patch 12/26] Xen-paravirt_ops: Fix patch site clobbers to include
 return register

Jeremy Fitzhardinge wrote:
> Fix a few clobbers to include the return register.  The clobbers set
> is the set of all registers modified (or may be modified) by the code
> snippet, regardless of whether it was deliberate or accidental.
>
> Signed-off-by: Jeremy Fitzhardinge <jeremy@...source.com>
> Cc: Rusty Russell <rusty@...tcorp.com.au>
> Cc: Zachary Amsden <zach@...are.com>
>
> ---
>  include/asm-i386/paravirt.h |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> ===================================================================
> --- a/include/asm-i386/paravirt.h
> +++ b/include/asm-i386/paravirt.h
> @@ -556,7 +556,7 @@ static inline unsigned long __raw_local_
>  					   "popl %%edx; popl %%ecx")
>  			     : "=a"(f): "m"(paravirt_ops.save_fl),
>  			       paravirt_type(PARAVIRT_PATCH(save_fl)),
> -			       paravirt_clobber(CLBR_NONE)
> +			       paravirt_clobber(CLBR_EAX)
>  			     : "memory", "cc");
>  	return f;
>   

Has this been tested on older gcc's?  I seem to recall them barfing over 
things like this.

Zach
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