On Sun, Jul 17, 2022 at 2:13 AM Sudip Mukherjee <sudipm.mukher...@gmail.com> wrote: > > I was trying to check it. With gcc-11 the assembly code generated is > not using memset, but using __memset. > But with gcc-12, I can see the assembly code is using memset. One > example from the assembly:
You could try making the 'args' array in 'struct prom_args' be marked 'volatile'. Ie something like this: --- a/arch/powerpc/kernel/prom_init.c +++ b/arch/powerpc/kernel/prom_init.c @@ -115,6 +115,6 @@ struct prom_args { __be32 service; __be32 nargs; __be32 nret; - __be32 args[10]; + volatile __be32 args[10]; }; because I think it's just the compilers turning the small loop over those fields into a "memset()". Linus