* Borislav Petkov <b...@alien8.de> wrote:
> On Thu, Jan 07, 2016 at 07:59:56AM -0700, tim.gard...@canonical.com wrote:
> > From: Tim Gardner <tim.gard...@canonical.com>
> >
> > arch/x86/kernel/cpu/microcode/intel.c: In function 'save_mc_for_early':
> > arch/x86/kernel/cpu/microcode/intel.c:516:1: warning: the frame size of
> > 1032 bytes is larger than 1024 bytes [-Wframe-larger-than=]
>
> Ok, so this looks like a 32-bit warning to me.
>
> Hmm, so, on the one hand we do have:
>
> $ git grep CONFIG_FRAME_WARN arch/x86/
> arch/x86/configs/i386_defconfig:291:CONFIG_FRAME_WARN=2048
>
> which came in with:
>
> 5cb04df8d3f0 ("x86: defconfig updates")
>
> and OTOH:
>
> config FRAME_WARN
> int "Warn for stack frames larger than (needs gcc 4.4)"
> range 0 8192
> default 0 if KASAN
> default 1024 if !64BIT
> ^^^^
>
> default 2048 if 64BIT
> help
> Tell gcc to warn at build time for stack frames larger than this.
> Setting this too low will cause a lot of warnings.
> Setting it to 0 disables the warning.
> Requires gcc 4.4
>
> which is still 1024.
>
> tip guys, maybe it is time to update lib/Kconfig.debug too?
I think we should rather update the 32-bit defconfig? 64-bit stacks are more
generous, and a 2K stack footprint is pretty extreme on 32-bit I think ...
Thanks,
Ingo
