Re: [Xen-devel] [PATCH 2/2] xen: arm: update arm32 assembly primitives to Linux v3.16-rc6

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2014-07-25 at 16:42 +0100, Julien Grall wrote:
> Hi Ian,
> 
> On 07/25/2014 04:22 PM, Ian Campbell wrote:
> > bitops, cmpxchg, atomics: Import:
> >   c32ffce ARM: 7984/1: prefetch: add prefetchw invocations for barriered 
> > atomics
> 
> Compare to Linux we don't have specific prefetch* helpers. We directly
> use the compiler builtin ones. Shouldn't we import the ARM specific
> helpers to gain in performance?

My binaries are full of pld instructions where I think I would expect
them, so it seems like the compiler builtin ones are sufficient.

I suspect the Linux define is there to cope with older compilers or
something.

Ian.


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