[PATCH] [ARM] Introduce patching of phys_to_virt and vice versa

Eric Miao
2010-08-05T13:01:53Z

On Thu, Aug 5, 2010 at 5:45 PM, Russell King - ARM Linux
<linux@arm.linux.org.uk> wrote:
> On Thu, Aug 05, 2010 at 04:45:25PM +0800, Eric Miao wrote:
>> On Wed, Jul 21, 2010 at 5:16 AM, Russell King - ARM Linux
>> <linux@arm.linux.org.uk> wrote:
>> > On Fri, Jul 02, 2010 at 10:06:04AM -0500, Rob Herring wrote:
>> >> Should something more generic like the x86 alternative code be done for
>> >> ARM? It's very likely we will need patching in other places like for UP
>> >> and SMP in one kernel.
>> >
>> > I think yes, we need to - I can't see how we can sensibly combine
>> > kernels without this.
>> >
>> > However, the effect of this is that XIP can't use this - as the
>> > kernel text is read-only.
>> >
>>
>> Hi Russell,
>>
>> Sorry for late update on this. I've addressed your comments as below,
>> and really hope this can get into this merge window, so I'm also sending
>> this to your patch system right now ;-)
>
> How does this affect the compiler's instruction scheduling w.r.t. previous
> load instructions?
>

I'm not really sure, so is there some testing benchmarking program
this can be measured?