linux-kernel - [kvm-unit-tests PATCH v2 1/4] arm: Fix clang error in sve

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Message-ID: <20241023152638.3317648-2-rananta@google.com>
Date: Wed, 23 Oct 2024 15:26:35 +0000
From: Raghavendra Rao Ananta <rananta@...gle.com>
To: Subhasish Ghosh <subhasish.ghosh@....com>, Joey Gouly <joey.gouly@....com>, 
	Andrew Jones <andrew.jones@...ux.dev>
Cc: Oliver Upton <oliver.upton@...ux.dev>, Marc Zyngier <maz@...nel.org>, 
	Raghavendra Rao Anata <rananta@...gle.com>, linux-arm-kernel@...ts.infradead.org, 
	kvmarm@...ts.linux.dev, linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: [kvm-unit-tests PATCH v2 1/4] arm: Fix clang error in sve_vl()

Fix the following clang error in sve_vl():

In file included from arm/selftest.c:16:
kvm-unit-tests/lib/asm/processor.h:163:16:
error: value size does not match register size specified by the
constraint and modifier [-Werror,-Wasm-operand-widths]
                     : "=r" (vl));
                             ^
kvm-unit-tests/lib/asm/processor.h:162:14:
note: use constraint modifier "w"
                     "rdvl %0, #8"
                           ^~
                           %w0
1 error generated.

Fixes: d47d370c8f ("arm: Add test for FPU/SIMD context save/restore")
Signed-off-by: Raghavendra Rao Ananta <rananta@...gle.com>
---
 lib/arm64/asm/processor.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/arm64/asm/processor.h b/lib/arm64/asm/processor.h
index b28d41fd..e261e74d 100644
--- a/lib/arm64/asm/processor.h
+++ b/lib/arm64/asm/processor.h
@@ -159,7 +159,7 @@ static inline int sve_vl(void)
 	int vl;
 
 	asm volatile(".arch_extension sve\n"
-		     "rdvl %0, #8"
+		     "rdvl %w0, #8"
 		     : "=r" (vl));
 
 	return vl;
-- 
2.47.0.105.g07ac214952-goog