Re: [PATCH] ARM: select HAVE_FUTEX_CMPXCHG

[Linus Walleij]

On Mon, Aug 30, 2021 at 11:38 PM Nick Desaulniers
<ndesaulniers@xxxxxxxxxx> wrote:

> tglx notes:
>   This function [futex_detect_cmpxchg] is only needed when an
>   architecture has to runtime discover whether the CPU supports it or
>   not.  ARM has unconditional support for this, so the obvious thing to
>   do is the below.
>
> Fixes linkage failure from Clang randconfigs:
> kernel/futex.o:(.text.fixup+0x5c): relocation truncated to fit: R_ARM_JUMP24 against `.init.text'
> and boot failures for CONFIG_THUMB2_KERNEL.
>
> Link: https://github.com/ClangBuiltLinux/linux/issues/325
> Reported-by: Arnd Bergmann <arnd@xxxxxxxx>
> Reported-by: Nathan Chancellor <nathan@xxxxxxxxxx>
> Suggested-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Signed-off-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>

LGTM
Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>

Please put this into Russell's patch tracker!

Yours,
Linus Walleij