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powerpc: Fix hard_irq_disable() with sanitizer

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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: 077fc62b2b ("powerpc/irq: remove inline assembly in hard_irq_disable macro")
Reported-by: Zhouyi Zhou <zhouzhouyi@gmail.com>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/a8298991b3df049a54ee8e558838e34265812014.1661272586.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2022-08-23 18:36:35 +02:00 committed by Michael Ellerman
parent 91926d8b7e
commit 814816d71e
1 changed files with 2 additions and 1 deletions
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3
arch/powerpc/include/asm/hw_irq.h
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@ -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)