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From:   Julien Thierry <julien.thierry@arm.com>
To:     linux-arm-kernel@lists.infradead.org
Cc:     linux-kernel@vger.kernel.org, rostedt@goodmis.org,
        marc.zyngier@arm.com, yuzenghui@huawei.com,
        wanghaibin.wang@huawei.com, james.morse@arm.com,
        will.deacon@arm.com, catalin.marinas@arm.com, mark.rutland@arm.com,
        liwei391@huawei.com, Julien Thierry <julien.thierry@arm.com>
Subject: [PATCH v3 2/8] arm64: irqflags: Pass flags as readonly operand to restore instruction
Date:   Thu,  6 Jun 2019 10:31:51 +0100
Message-Id: <1559813517-41540-3-git-send-email-julien.thierry@arm.com>
In-Reply-To: <1559813517-41540-1-git-send-email-julien.thierry@arm.com>
References: <1559813517-41540-1-git-send-email-julien.thierry@arm.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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.

Signed-off-by: Julien Thierry <julien.thierry@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
---
 arch/arm64/include/asm/irqflags.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/irqflags.h b/arch/arm64/include/asm/irqflags.h
index 62996318..9c93152 100644
--- 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");
 }

--
1.9.1