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From: Marc Zyngier <maz@kernel.org>
To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	kernel-team@android.com, Will Deacon <will@kernel.org>
Subject: [PATCH] arm64: Drop workaround for broken 'S' constraint with GCC 4.9
Date: Mon, 18 Jan 2021 13:01:29 +0000	[thread overview]
Message-ID: <20210118130129.2875949-1-maz@kernel.org> (raw)

Since GCC < 5.1 has been shown to be unsuitable for the arm64 kernel,
let's drop the workaround for the 'S' asm constraint that GCC 4.9
doesn't always grok.

This is effectively a revert of 9fd339a45be5 ("arm64: Work around
broken GCC 4.9 handling of "S" constraint").

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/include/asm/kvm_asm.h | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h
index 8a33d83ea843..7ccf770c53d9 100644
--- a/arch/arm64/include/asm/kvm_asm.h
+++ b/arch/arm64/include/asm/kvm_asm.h
@@ -199,12 +199,6 @@ extern void __vgic_v3_init_lrs(void);
 
 extern u32 __kvm_get_mdcr_el2(void);
 
-#if defined(GCC_VERSION) && GCC_VERSION < 50000
-#define SYM_CONSTRAINT	"i"
-#else
-#define SYM_CONSTRAINT	"S"
-#endif
-
 /*
  * Obtain the PC-relative address of a kernel symbol
  * s: symbol
@@ -221,7 +215,7 @@ extern u32 __kvm_get_mdcr_el2(void);
 		typeof(s) *addr;					\
 		asm("adrp	%0, %1\n"				\
 		    "add	%0, %0, :lo12:%1\n"			\
-		    : "=r" (addr) : SYM_CONSTRAINT (&s));		\
+		    : "=r" (addr) : "S" (&s));				\
 		addr;							\
 	})
 
-- 
2.29.2

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https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <maz@kernel.org>
To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	kernel-team@android.com, Will Deacon <will@kernel.org>
Subject: [PATCH] arm64: Drop workaround for broken 'S' constraint with GCC 4.9
Date: Mon, 18 Jan 2021 13:01:29 +0000	[thread overview]
Message-ID: <20210118130129.2875949-1-maz@kernel.org> (raw)

Since GCC < 5.1 has been shown to be unsuitable for the arm64 kernel,
let's drop the workaround for the 'S' asm constraint that GCC 4.9
doesn't always grok.

This is effectively a revert of 9fd339a45be5 ("arm64: Work around
broken GCC 4.9 handling of "S" constraint").

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/include/asm/kvm_asm.h | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h
index 8a33d83ea843..7ccf770c53d9 100644
--- a/arch/arm64/include/asm/kvm_asm.h
+++ b/arch/arm64/include/asm/kvm_asm.h
@@ -199,12 +199,6 @@ extern void __vgic_v3_init_lrs(void);
 
 extern u32 __kvm_get_mdcr_el2(void);
 
-#if defined(GCC_VERSION) && GCC_VERSION < 50000
-#define SYM_CONSTRAINT	"i"
-#else
-#define SYM_CONSTRAINT	"S"
-#endif
-
 /*
  * Obtain the PC-relative address of a kernel symbol
  * s: symbol
@@ -221,7 +215,7 @@ extern u32 __kvm_get_mdcr_el2(void);
 		typeof(s) *addr;					\
 		asm("adrp	%0, %1\n"				\
 		    "add	%0, %0, :lo12:%1\n"			\
-		    : "=r" (addr) : SYM_CONSTRAINT (&s));		\
+		    : "=r" (addr) : "S" (&s));				\
 		addr;							\
 	})
 
-- 
2.29.2


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

             reply	other threads:[~2021-01-18 13:03 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-18 13:01 Marc Zyngier [this message]
2021-01-18 13:01 ` [PATCH] arm64: Drop workaround for broken 'S' constraint with GCC 4.9 Marc Zyngier
2021-01-18 16:26 ` Catalin Marinas
2021-01-18 16:26   ` Catalin Marinas
2021-01-18 16:28   ` Marc Zyngier
2021-01-18 16:28     ` Marc Zyngier
2021-01-20 13:01 ` Will Deacon
2021-01-20 13:01   ` Will Deacon

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