[Xen-devel] Re: [PATCH RFC V4 09/10] x86/jump_label: use GENERIC_NOP5_ATOMIC instead of jmp5 +0

["H. Peter Anvin" <hpa@xxxxxxxxx>]

On 10/13/2011 11:37 AM, Steven Rostedt wrote:
> On Thu, 2011-10-13 at 09:57 -0700, Jeremy Fitzhardinge wrote:
>> On 10/13/2011 08:40 AM, H. Peter Anvin wrote:
>>> On 10/12/2011 05:08 PM, Jeremy Fitzhardinge wrote:
>>>> From: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
>>>>
>>>> GENERIC_NOP5_ATOMIC should make a better nop.
>>>>
>>> On 32 bits, yes.  On 64 bits you should use P6_NOP5_ATOMIC.
>>
>> Something like this?
>>
> 
> No, we only care about 5byte nops here. Look at ideal_nop in
> alterative.c
> 

He needs a compile-time alternative.

        -hpa


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