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SubjectRe: [PATCH] Use -mskip-rax-setup if supported
On Thu, Apr 16, 2015 at 02:23:44PM -0700, H.J. Lu wrote:
> GCC 5 added a compiler option, -mskip-rax-setup, for x86-64. It skips
> setting up the RAX register when SSE is disabled and there are no
> variable arguments passed in vector registers. Since kernel doesn't
> pass vector registers to functions with variable arguments, this option
> can be used to optimize the x86-64 kernel. For kernel 3.17:
>
> text data bss dec hex filename
> 11455921 2204048 5853184 19513153 129bf41 vmlinux #with -mskip-rax-setup
> 11480079 2204048 5853184 19537311 12a1d9f vmlinux

Patch looks good to me.

Reviewed-by: Andi Kleen <ak@linux.intel.com>

-Andi


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