Re: [patch] x86: add -freg-struct-return to CFLAGS

Andi Kleen
2007-02-22T11:23:30Z

On Thu, Feb 22, 2007 at 09:38:22AM +0100, Ingo Molnar wrote:
> Subject: [patch] x86: add -freg-struct-return to CFLAGS
> From: Ingo Molnar <mingo@elte.hu>
>
> Jeremy Fitzhardinge suggested the use of -freg-struct-return, which does
> structure-returns (such as when using pte_t) in registers instead of on
> the stack.
>
> that is indeed so, and this option reduced the kernel size a bit:
>
> text data bss dec hex filename
> 4799506 543456 3760128 9103090 8ae6f2 vmlinux.before
> 4798117 543456 3760128 9101701 8ae185 vmlinux.after
>
> the resulting kernel booted fine on my testbox. Lets go for it.

Ok I added it for now. Let's see what happens.

I guess people maintaining external Makefiles without Kbuild
are in for a nasty surprise again though. Cannot be avoided unfortunately.

-Andi