[PATCH v3] powerpc32: memset: only use dcbz once cache is enabled

Michal Sojka sojkam1 at fel.cvut.cz
Mon Sep 14 17:15:00 AEST 2015

On Mon, Sep 14 2015, Christophe Leroy wrote:
> memset() uses instruction dcbz to speed up clearing by not wasting time
> loading cache line with data that will be overwritten.
> Some platform like mpc52xx do no have cache active at startup and
> can therefore not use memset(). Allthough no part of the code
> explicitly uses memset(), GCC may makes calls to it.
> This patch modifies memset() such that at startup, memset()
> unconditionally jumps to simple_memset() which doesn't use
> the dcbz instruction.

I tested both v3 patches (memcpy and memset) and they work for me.


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