Re: [PATCH v11 8/8] PPC: Don't use hardcoded opcode for ePAPR hcall invocation

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On 07/02/2012 07:30 AM, Alexander Graf wrote:
> 
> On 22.06.2012, at 22:06, Stuart Yoder wrote:
> 
>> From: Liu Yu-B13201 <Yu.Liu@xxxxxxxxxxxxx>
>>
>> Signed-off-by: Liu Yu <yu.liu@xxxxxxxxxxxxx>
>> Signed-off-by: Stuart Yoder <stuart.yoder@xxxxxxxxxxxxx>
>> ---
>> -v11: no changes
>>
>> arch/powerpc/include/asm/epapr_hcalls.h |   22 +++++++++---------
>> arch/powerpc/include/asm/fsl_hcalls.h   |   36 +++++++++++++++---------------
>> 2 files changed, 29 insertions(+), 29 deletions(-)
>>
>> diff --git a/arch/powerpc/include/asm/epapr_hcalls.h b/arch/powerpc/include/asm/epapr_hcalls.h
>> index 833ce2c..b8d9445 100644
>> --- a/arch/powerpc/include/asm/epapr_hcalls.h
>> +++ b/arch/powerpc/include/asm/epapr_hcalls.h
>> @@ -195,7 +195,7 @@ static inline unsigned int ev_int_set_config(unsigned int interrupt,
>> 	r5  = priority;
>> 	r6  = destination;
>>
>> -	__asm__ __volatile__ ("sc 1"
>> +	asm volatile("bl	epapr_hypercall_start"
>> 		: "+r" (r11), "+r" (r3), "+r" (r4), "+r" (r5), "+r" (r6)
>> 		: : EV_HCALL_CLOBBERS4
> 
> Hrm. ePAPR hypercalls are allowed to clobber lr, right? But our hypercall entry code depends on lr staying alive:

ePAPR 1.1 says LR is nonvolatile.

-Scott

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