Re: Prefetches in memcpy

["Kevin D. Kissell" <kevink@mips.com>]

From: "Ralf Baechle" <ralf@uni-koblenz.de>
> So I think the fix will have to be:
> 
>  - Avoid prefetching beyond the end of the copy area in memcpy and memmove.
>  - Introduce a second variant of memcpy that never does prefetching.  This
>    one will be safe to use in KSEG1 / uncached XKPHYS also and will be used
>    for memcpy_fromio, memcpy_toio and friends.

Assuming we had a version that prefetched exactly to the end
of the source memory block and no further, why would we need
the second variant?

            Kevin K.