[GIT PULL] prefetch support for 3.13

[Russell King - ARM Linux]

On Wed, Oct 30, 2013 at 08:53:08AM -0700, Paul Walmsley wrote:
> Hi Russell,
>
> On Wed, 30 Oct 2013, Russell King - ARM Linux wrote:
>
>> On Wed, Oct 30, 2013 at 08:24:35AM -0700, Paul Walmsley wrote:
>>> Hi Will et al.,
>>>
>>> On 10/09/2013 10:13 AM, Will Deacon wrote:
>>>> Hi Russell,
>>>>
>>>> Please pull the following patches for 3.13. They add support for the pldw
>>>> instruction (prefetch with intent to modify) in ARMv7 SMP cores, which is
>>>> then used to gain a measurable performance boost for particular atomic
>>>> sequences.
>>>
>>> Looks like the pldw changes require binutils >= 2.21.  Might be worth
>>> considering a patch to update Documentation/Changes?
>>
>> Not really - because that says "for all architectures the minimum
>> requirement is now 2.21 or later" and that's certainly not the case.
>>
>> It's only ARMv7 which requires this.
>
> Would you consider something like the following?

I think it's up to others whether we want to start adding this level of
detail to this file.  Given that we already have x86 there, I don't see
a problem with this.

Acked-by: Russell King <rmk+kernel at arm.linux.org.uk>