Re: [PATCH] x86/boot: Use __ASM_SIZE() to reduce ifdeffery in cpuflags.c

[Uros Bizjak]

On Thu, Jul 18, 2024 at 8:59 AM H. Peter Anvin <hpa@xxxxxxxxx> wrote:
>
> >> >-#ifdef __x86_64__
> >> >-#define PUSHF "pushfq"
> >> >-#define POPF "popfq"
> >> >-#else
> >> >-#define PUSHF "pushfl"
> >> >-#define POPF "popfl"
> >> >-#endif
> >> >+#define PUSHF __ASM_SIZE(pushf)
> >> >+#define POPF __ASM_SIZE(popf)
> >> >
> >> > int has_eflag(unsigned long mask)
> >> > {
> >>
> >> Just use pushf/popf. gas hasn't needed that suffix for a long time as far as I know.
> >
> >Yes, this works, too. So I guess we can also remove the comment
> >explaining the reason for explicit suffixes?
> >
> >Thanks,
> >Uros.
> >
>
> Yeah. You may want to check the version of binutils that fixed it and put that in the comments.

I have checked that the build works with 9 year old binutils-2.25
(minimal required version), so the fix was applied to an even earlier
version. I guess we don't want to burden unsuspecting readers with
historic toolchain oddities, so I propose to just remove the comment
for good.

Uros.