[PATCH] ARM: select HAVE_FUTEX_CMPXCHG

[Thomas Gleixner]

On Mon, Aug 30 2021 at 14:38, Nick Desaulniers 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 at arndb.de>
> Reported-by: Nathan Chancellor <nathan at kernel.org>
> Suggested-by: Thomas Gleixner <tglx at linutronix.de>
> Signed-off-by: Nick Desaulniers <ndesaulniers at google.com>

Reviewed-by: Thomas Gleixner <tglx at linutronix.de>