linux-kernel - [PATCH 5.4 007/168] arm64: Silence clang warning on mismatched value/register sizes

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Date:   Tue, 28 Apr 2020 20:23:01 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Nathan Chancellor <natechancellor@...il.com>,
        James Morse <james.morse@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 007/168] arm64: Silence clang warning on mismatched value/register sizes

From: Catalin Marinas <catalin.marinas@....com>

[ Upstream commit: 27a22fbdeedd6c5c451cf5f830d51782bf50c3a2 ]

Clang reports a warning on the __tlbi(aside1is, 0) macro expansion since
the value size does not match the register size specified in the inline
asm. Construct the ASID value using the __TLBI_VADDR() macro.

Fixes: 222fc0c8503d ("arm64: compat: Workaround Neoverse-N1 #1542419 for compat user-space")
Reported-by: Nathan Chancellor <natechancellor@...il.com>
Cc: James Morse <james.morse@....com>
Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: James Morse <james.morse@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/arm64/kernel/sys_compat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/sys_compat.c b/arch/arm64/kernel/sys_compat.c
index c9fb02927d3e5..3c18c2454089b 100644
--- a/arch/arm64/kernel/sys_compat.c
+++ b/arch/arm64/kernel/sys_compat.c
@@ -37,7 +37,7 @@ __do_compat_cache_op(unsigned long start, unsigned long end)
 			 * The workaround requires an inner-shareable tlbi.
 			 * We pick the reserved-ASID to minimise the impact.
 			 */
-			__tlbi(aside1is, 0);
+			__tlbi(aside1is, __TLBI_VADDR(0, 0));
 			dsb(ish);
 		}
 
-- 
2.20.1