As reported by Zhouyi Zhou, WRITE_ONCE() is not atomic
as expected when KASAN or KCSAN are compiled in.
Fix it by re-implementing it using inline assembly.
Reported-by: Zhouyi Zhou <zhouzho...@gmail.com>
Fixes: 077fc62b2b66 ("powerpc/irq: remove inline assembly in hard_irq_disable
macro")
Signed-off-by: Christophe Leroy <christophe.le...@csgroup.eu>
---
arch/powerpc/include/asm/hw_irq.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/include/asm/hw_irq.h
b/arch/powerpc/include/asm/hw_irq.h
index 8a7b0b78a80e..83ab6668387b 100644
--- a/arch/powerpc/include/asm/hw_irq.h
+++ b/arch/powerpc/include/asm/hw_irq.h
@@ -285,7 +285,8 @@ static inline bool pmi_irq_pending(void)
flags = irq_soft_mask_set_return(IRQS_ALL_DISABLED); \
local_paca->irq_happened |= PACA_IRQ_HARD_DIS; \
if (!arch_irqs_disabled_flags(flags)) { \
- WRITE_ONCE(local_paca->saved_r1, current_stack_pointer);\
+ asm volatile("std%X0 %1,%0" : "=m" (local_paca->saved_r1) \
+ : "r" (current_stack_pointer)); \
trace_hardirqs_off(); \
} \
} while(0)
--
2.37.1
