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Subject[PATCH v4 14/17] arm/arm64: smccc: Make function identifiers an unsigned quantity
Date
Function identifiers are a 32bit, unsigned quantity. But we never
tell so to the compiler, resulting in the following:

4ac: b26187e0 mov x0, #0xffffffff80000001

We thus rely on the firmware narrowing it for us, which is not
always a reasonable expectation.

Cc: stable@vger.kernel.org
Reported-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
include/linux/arm-smccc.h | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h
index e1ef944ef1da..dd44d8458c04 100644
--- a/include/linux/arm-smccc.h
+++ b/include/linux/arm-smccc.h
@@ -14,14 +14,16 @@
#ifndef __LINUX_ARM_SMCCC_H
#define __LINUX_ARM_SMCCC_H

+#include <uapi/linux/const.h>
+
/*
* This file provides common defines for ARM SMC Calling Convention as
* specified in
* http://infocenter.arm.com/help/topic/com.arm.doc.den0028a/index.html
*/

-#define ARM_SMCCC_STD_CALL 0
-#define ARM_SMCCC_FAST_CALL 1
+#define ARM_SMCCC_STD_CALL _AC(0,U)
+#define ARM_SMCCC_FAST_CALL _AC(1,U)
#define ARM_SMCCC_TYPE_SHIFT 31

#define ARM_SMCCC_SMC_32 0
--
2.14.2
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