Re: [PATCH] powerpc/32: Don't use lmw/stmw for saving/restoring non volatile regs

On Mon, 23 Aug 2021 15:29:12 +0000 (UTC), Christophe Leroy wrote:

Instructions lmw/stmw are interesting for functions that are rarely
used and not in the cache, because only one instruction is to be
copied into the instruction cache instead of 19. However those
instruction are less performant than 19x raw lwz/stw as they require
synchronisation plus one additional cycle.

SAVE_NVGPRS / REST_NVGPRS are used in only a few places which are
mostly in interrupts entries/exits and in task switch so they are
likely already in the cache.

[...]

Applied to powerpc/next.

[1/1] powerpc/32: Don't use lmw/stmw for saving/restoring non volatile regs
      https://git.kernel.org/powerpc/c/a85c728cb5e12216c19ae5878980c2cbbbf8616d

cheers