arm64: irqflags: Pass flags as readonly operand to restore instruction

Flags are only read by the instructions doing the irqflags restore
operation. Pass the operand as read only to the asm inline instead of
read-write.

Cc: Will Deacon <will.deacon@arm.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Mark Rutland <mark.rutland@ar.com>
Signed-off-by: Julien Thierry <julien.thierry@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/include/asm/irqflags.h b/arch/arm64/include/asm/irqflags.h
index 6299631890857365626641c225c06645beb123e8..9c93152c9af746738361401fdfec10e258c0417d 100644 (file)
--- a/arch/arm64/include/asm/irqflags.h
+++ b/arch/arm64/include/asm/irqflags.h
@@ -119,8 +119,8 @@ static inline void arch_local_irq_restore(unsigned long flags)
                        __msr_s(SYS_ICC_PMR_EL1, "%0")
                        "dsb    sy",
                        ARM64_HAS_IRQ_PRIO_MASKING)
-               : "+r" (flags)
                :
+               : "r" (flags)
                : "memory");
 }