Re: [patch 4/21] fix ARCH_HAS_PREFETCH

[Andi Kleen]

Andrew Morton <[e-mail]> writes:

> Which needs a working ARCH_HAS_PREFETCH to avoid probable extra code
> generation on CPUs which don't have prefetch.

When you use gcc 3.1+ you can use __builtin_prefetch() and gcc takes care of
it. See asm-x86_64/prefetch.h of a working example.

Of course generic C code should not use the ugly builtins directly, but
it could be used to define the wrappers.

-Andi