From 814816d71e29934d0a76ee259b54c0b80c3b0e4a Mon Sep 17 00:00:00 2001 From: Christophe Leroy Date: Tue, 23 Aug 2022 18:36:35 +0200 Subject: powerpc: Fix hard_irq_disable() with sanitizer 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. Fixes: 077fc62b2b66 ("powerpc/irq: remove inline assembly in hard_irq_disable macro") Reported-by: Zhouyi Zhou Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/a8298991b3df049a54ee8e558838e34265812014.1661272586.git.christophe.leroy@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 26ede09c521d..3c8cb48f88ae 100644 --- a/arch/powerpc/include/asm/hw_irq.h +++ b/arch/powerpc/include/asm/hw_irq.h @@ -282,7 +282,8 @@ 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) -- cgit v1.2.3