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

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Date:	Thu, 01 Mar 2007 16:49:47 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Zachary Amsden <zach@...are.com>
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

Zachary Amsden wrote:
> 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.

Things like what?  Do you mean the %[foo] asm parameter syntax?  I think
those versions are no longer supported - Arjan posted a patch a few days
ago to convert a pile of asms to this form.  Or do you mean something else?

    J
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