This is a note to let you know that I've just added the patch titled
ARM: 9122/1: select HAVE_FUTEX_CMPXCHG
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm-9122-1-select-have_futex_cmpxchg.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9d417cbe36eee7afdd85c2e871685f8dab7c2dba Mon Sep 17 00:00:00 2001
From: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Date: Wed, 8 Sep 2021 19:25:59 +0100
Subject: ARM: 9122/1: select HAVE_FUTEX_CMPXCHG
From: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
commit 9d417cbe36eee7afdd85c2e871685f8dab7c2dba upstream.
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
Comments from Nick Desaulniers:
See-also: 03b8c7b623c8 ("futex: Allow architectures to skip
futex_atomic_cmpxchg_inatomic() test")
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>
Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Tested-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # v3.14+
Reviewed-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/Kconfig | 1 +
1 file changed, 1 insertion(+)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -87,6 +87,7 @@ config ARM
select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL
select HAVE_FUNCTION_GRAPH_TRACER if !THUMB2_KERNEL && !CC_IS_CLANG
select HAVE_FUNCTION_TRACER if !XIP_KERNEL
+ select HAVE_FUTEX_CMPXCHG if FUTEX
select HAVE_GCC_PLUGINS
select HAVE_HW_BREAKPOINT if PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7)
select HAVE_IDE if PCI || ISA || PCMCIA
Patches currently in stable-queue which might be from ndesaulniers@xxxxxxxxxx are
queue-5.10/elfcore-correct-reference-to-config_uml.patch
queue-5.10/arm-9122-1-select-have_futex_cmpxchg.patch
