Re: [PATCH] Kconfig.debug: disable CONFIG_FRAME_WARN for KASAN_STACK && CC_IS_CLANG by default

[Arnd Bergmann]

On Fri, Apr 21, 2023, at 15:01, Tudor Ambarus wrote:

> The conclusion is that when KASAN is enabled the stack usage increases a
> bit, but nothing unmanageable ~30-70 bytes, whereas when enabling
> KASAN_STACK the stack usage is excessive, from ~1.7K to ~5.8K for these
> cases.
>
> Disable CONFIG_FRAME_WARN for KASAN_STACK && CC_IS_CLANG by default.
> Adventurers can still override the default value by input prompt or
> explicit values in defconfigs in case they feel that some real warnings
> are missed.
>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxx>

I think we are still better off with the warning enabled. When someone
really wants to run a kernel with KASAN_STACK enabled, they should have
a chance to see what they are getting into and not report any runtime
bugs that come from stack overflow. 

      Arnd