Christophe Leroy <christophe.le...@c-s.fr> writes: > memset() is patched after initialisation to activate the > optimised part which uses cache instructions. > > Today we have a 'b 2f' to skip the optimised patch, which then gets > replaced by a NOP, implying a useless cycle consumption. > As we have a 'bne 2f' just before, we could use that instruction > for the live patching, hence removing the need to have a > dedicated 'b 2f' to be replaced by a NOP. > > This patch changes the 'bne 2f' by a 'b 2f'. During init, that > 'b 2f' is then replaced by 'bne 2f'
I'm not sure what the sequence is during boot for the 32-bit code, but can you use an ALT_FTR section for this? Possibly that doesn't get done at the right time though. cheers
