From 9aaf9bb7943be36ebde177a297ff54824961408d Mon Sep 17 00:00:00 2001 From: Daniel Thompson Date: Fri, 15 Jan 2021 13:21:10 +0100 Subject: [PATCH] ARM: 9050/1: Kconfig: Select ARCH_HAVE_NMI_SAFE_CMPXCHG where possible Currently ARCH_HAVE_NMI_SAFE_CMPXCHG is not set on Arm systems and this makes it impossible to enable features such as ftrace histogram triggers on Arm platforms. Most Arm systems are NMI safe simply because there is no NMI but this isn't universally true meaning we cannot set ARCH_HAVE_NMI_SAFE_CMPXCHG for all Arm devices. However the load/store exclusive implementation of cmpxchg is NMI-safe and this implementation is used ARMv6k and later. Let's select ARCH_HAVE_NMI_SAFE_CMPXCHG for these systems. Note that ARMv6 uses load/store exclusive for 32-bit cmpxchg but relies on interrupt masking for 8- and 16-bit operations. This patch is conservative and does not change behaviour for CPU_V6. Signed-off-by: Daniel Thompson Signed-off-by: Russell King --- arch/arm/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 9860057775ee..2424d1648c65 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -23,6 +23,7 @@ config ARM select ARCH_HAS_TEARDOWN_DMA_OPS if MMU select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_HAVE_CUSTOM_GPIO_H + select ARCH_HAVE_NMI_SAFE_CMPXCHG if CPU_V7 || CPU_V7M || CPU_V6K select ARCH_HAS_GCOV_PROFILE_ALL select ARCH_KEEP_MEMBLOCK select ARCH_MIGHT_HAVE_PC_PARPORT