Messages in this thread | | | From | Michael Ellerman <> | Subject | Re: [v4,1/2] powerpc32: memcpy: only use dcbz once cache is enabled | Date | Thu, 17 Sep 2015 15:13:27 +1000 (AEST) |
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On Wed, 2015-16-09 at 10:04:51 UTC, LEROY Christophe 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, memcpy() > unconditionally jumps to generic_memcpy() which doesn't use > the dcbz instruction. > > Once the initial MMU is set up, in machine_init() we patch memcpy() > by replacing this inconditional jump by a NOP > > Reported-by: Michal Sojka <sojkam1@fel.cvut.cz> > Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Applied to powerpc fixes, thanks.
https://git.kernel.org/powerpc/c/1cd03890ea64795e53f17a94
cheers
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