[PATCH/RFC] s390/kernel: use stnsm instead of stosm

2014-12-16 Thread Christian Borntraeger 
At least on z196 stnsm is faster than stosm.

Signed-off-by: Christian Borntraeger 
---
 arch/s390/include/asm/irqflags.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/s390/include/asm/irqflags.h b/arch/s390/include/asm/irqflags.h
index 37b9091..16aa0c7 100644
--- a/arch/s390/include/asm/irqflags.h
+++ b/arch/s390/include/asm/irqflags.h
@@ -36,7 +36,7 @@ static inline notrace void __arch_local_irq_ssm(unsigned long 
flags)
 
 static inline notrace unsigned long arch_local_save_flags(void)
 {
-   return __arch_local_irq_stosm(0x00);
+   return __arch_local_irq_stnsm(0xff);
 }
 
 static inline notrace unsigned long arch_local_irq_save(void)
-- 
1.9.3

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Re: [PATCH/RFC] s390/kernel: use stnsm instead of stosm

2014-12-16 Thread Christian Borntraeger 
Paolo,


sorry, should have only go to Martin and Heiko. 
Nothing to worry about from your side. :-)


Am 16.12.2014 um 10:30 schrieb Christian Borntraeger:
> At least on z196 stnsm is faster than stosm.
> 
> Signed-off-by: Christian Borntraeger 
> ---
>  arch/s390/include/asm/irqflags.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/s390/include/asm/irqflags.h 
> b/arch/s390/include/asm/irqflags.h
> index 37b9091..16aa0c7 100644
> --- a/arch/s390/include/asm/irqflags.h
> +++ b/arch/s390/include/asm/irqflags.h
> @@ -36,7 +36,7 @@ static inline notrace void __arch_local_irq_ssm(unsigned 
> long flags)
> 
>  static inline notrace unsigned long arch_local_save_flags(void)
>  {
> - return __arch_local_irq_stosm(0x00);
> + return __arch_local_irq_stnsm(0xff);
>  }
> 
>  static inline notrace unsigned long arch_local_irq_save(void)
> 

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Re: [PATCH/RFC] s390/kernel: use stnsm instead of stosm

2014-12-16 Thread Paolo Bonzini 


On 16/12/2014 10:31, Christian Borntraeger wrote:
> Paolo,
> 
> 
> sorry, should have only go to Martin and Heiko. 
> Nothing to worry about from your side. :-)

No problem, it's always fun to learn new s390 instructions. :)

Paolo
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