Commit cb1293e2f594 ("ARM: 8375/1: disable some options on ARMv7-M") causes the build to on ARMv7-M machines:

CC arch/arm/kernel/asm-offsets.s In file included from include/linux/sem.h:5:0, from include/linux/sched.h:35, from arch/arm/kernel/asm-offsets.c:14: include/linux/rcupdate.h: In function 'rcu_read_lock_sched_held': include/linux/rcupdate.h:539:2: error: implicit declaration of function 'arch_irqs_disabled' [-Werror=implicit-function-declaration] return preempt_count() != 0 || irqs_disabled();

asm-generic/irqflags.h provides an implementation of arch_irqs_disabled(). Lets grab an implementation from there!

Suggested-by: Russell King linux@arm.linux.org.uk Signed-off-by: Daniel Thompson daniel.thompson@linaro.org Acked-by: Maxime Coquelin maxime.coquelin@st.com ---

Notes: Compile tested on v4.1-rc6 using all arch/arm/configs. Boot tested on v4.1-rc6 with versatile_defconfig and multi_v7_defconfig. Boot tested on linux-next-20150608 using stm32_defconfig (out-of-tree).

arch/arm/include/asm/irqflags.h | 11 +++++++++++ 1 file changed, 11 insertions(+)

diff --git a/arch/arm/include/asm/irqflags.h b/arch/arm/include/asm/irqflags.h index 3b763d6652a0..43908146a5cf 100644 --- a/arch/arm/include/asm/irqflags.h +++ b/arch/arm/include/asm/irqflags.h @@ -20,6 +20,7 @@

#if __LINUX_ARM_ARCH__ >= 6

+#define arch_local_irq_save arch_local_irq_save static inline unsigned long arch_local_irq_save(void) { unsigned long flags; @@ -31,6 +32,7 @@ static inline unsigned long arch_local_irq_save(void) return flags; }

+#define arch_local_irq_enable arch_local_irq_enable static inline void arch_local_irq_enable(void) { asm volatile( @@ -40,6 +42,7 @@ static inline void arch_local_irq_enable(void) : "memory", "cc"); }

+#define arch_local_irq_disable arch_local_irq_disable static inline void arch_local_irq_disable(void) { asm volatile( @@ -56,6 +59,7 @@ static inline void arch_local_irq_disable(void) /* * Save the current interrupt enable state & disable IRQs */ +#define arch_local_irq_save arch_local_irq_save static inline unsigned long arch_local_irq_save(void) { unsigned long flags, temp; @@ -73,6 +77,7 @@ static inline unsigned long arch_local_irq_save(void) /* * Enable IRQs */ +#define arch_local_irq_enable arch_local_irq_enable static inline void arch_local_irq_enable(void) { unsigned long temp; @@ -88,6 +93,7 @@ static inline void arch_local_irq_enable(void) /* * Disable IRQs */ +#define arch_local_irq_disable arch_local_irq_disable static inline void arch_local_irq_disable(void) { unsigned long temp; @@ -135,6 +141,7 @@ static inline void arch_local_irq_disable(void) /* * Save the current interrupt enable state. */ +#define arch_local_save_flags arch_local_save_flags static inline unsigned long arch_local_save_flags(void) { unsigned long flags; @@ -147,6 +154,7 @@ static inline unsigned long arch_local_save_flags(void) /* * restore saved IRQ & FIQ state */ +#define arch_local_irq_restore arch_local_irq_restore static inline void arch_local_irq_restore(unsigned long flags) { asm volatile( @@ -156,10 +164,13 @@ static inline void arch_local_irq_restore(unsigned long flags) : "memory", "cc"); }

+#define arch_irqs_disabled_flags arch_irqs_disabled_flags static inline int arch_irqs_disabled_flags(unsigned long flags) { return flags & IRQMASK_I_BIT; }

+#include <asm-generic/irqflags.h> + #endif /* ifdef __KERNEL__ */ #endif /* ifndef __ASM_ARM_IRQFLAGS_H */ -- 2.4.2