Re: [PATCH] ARM: select HAVE_FUTEX_CMPXCHG
From: Nathan Chancellor <nathan@kernel.org>
Date: 2021-08-30 23:31:52
Also in:
linux-arm-kernel, lkml
On Mon, Aug 30, 2021 at 02:38:43PM -0700, 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@arndb.de> Reported-by: Nathan Chancellor <nathan@kernel.org> Suggested-by: Thomas Gleixner <redacted> Signed-off-by: Nick Desaulniers <redacted>
Tested-by: Nathan Chancellor <nathan@kernel.org>
quoted hunk ↗ jump to hunk
--- arch/arm/Kconfig | 1 + 1 file changed, 1 insertion(+)diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index fc196421b2ce..b760dd45b734 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig@@ -92,6 +92,7 @@ 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_IRQ_TIME_ACCOUNTING-- 2.33.0.259.gc128427fd7-goog