On Mon, Sep 07 2015, Christophe Leroy wrote: > memcpy() uses instruction dcbz to speed up copy 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 memcpy(). Allthough no part of the code > explicitly uses memcpy(), GCC makes calls to it. > > This patch modifies memcpy() such that at startup, the 'dcbz' > instruction is replaced by 'dcbt' which is harmless if cache is not > enabled, and which helps a bit (allthough not as much as dcbz) if > cache is already enabled. > > Once the initial MMU is setup, in machine_init() we patch memcpy() > by replacing the temporary 'dcbt' by 'dcbz' > > Reported-by: Michal Sojka <sojk...@fel.cvut.cz> > Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr> > --- > @Michal, can you please test it ?
Yes, it works. Tested-by: Michal Sojka <sojk...@fel.cvut.cz> -Michal _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
