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From: Nick Desaulniers <ndesaulniers@google.com>
To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>
Cc: llvm@lists.linux.dev, linux-kernel@vger.kernel.org,
	 linux-arm-kernel@lists.infradead.org,
	 Vincenzo Frascino <vincenzo.frascino@arm.com>,
	Nathan Chancellor <nathan@kernel.org>,
	 Nick Desaulniers <ndesaulniers@google.com>,
	Arnd Bergmann <arnd@arndb.de>
Subject: [PATCH v2 2/4] arm64: vdso32: drop test for -march=armv8-a
Date: Tue, 19 Oct 2021 15:36:44 -0700	[thread overview]
Message-ID: <20211019223646.1146945-3-ndesaulniers@google.com> (raw)
In-Reply-To: <20211019223646.1146945-1-ndesaulniers@google.com>

As Arnd points out:
  gcc-4.8 already supported -march=armv8, and we require gcc-5.1 now, so
  both this #if/#else construct and the corresponding
  "cc32-option,-march=armv8-a" check should be obsolete now.

Link: https://lore.kernel.org/lkml/CAK8P3a3UBEJ0Py2ycz=rHfgog8g3mCOeQOwO0Gmp-iz6Uxkapg@mail.gmail.com/
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
---
 arch/arm64/include/asm/vdso/compat_barrier.h | 7 -------
 arch/arm64/kernel/vdso32/Makefile            | 8 +-------
 2 files changed, 1 insertion(+), 14 deletions(-)

diff --git a/arch/arm64/include/asm/vdso/compat_barrier.h b/arch/arm64/include/asm/vdso/compat_barrier.h
index fb60a88b5ed4..3ac35f4a667c 100644
--- a/arch/arm64/include/asm/vdso/compat_barrier.h
+++ b/arch/arm64/include/asm/vdso/compat_barrier.h
@@ -20,16 +20,9 @@
 
 #define dmb(option) __asm__ __volatile__ ("dmb " #option : : : "memory")
 
-#if __LINUX_ARM_ARCH__ >= 8
 #define aarch32_smp_mb()	dmb(ish)
 #define aarch32_smp_rmb()	dmb(ishld)
 #define aarch32_smp_wmb()	dmb(ishst)
-#else
-#define aarch32_smp_mb()	dmb(ish)
-#define aarch32_smp_rmb()	aarch32_smp_mb()
-#define aarch32_smp_wmb()	dmb(ishst)
-#endif
-
 
 #undef smp_mb
 #undef smp_rmb
diff --git a/arch/arm64/kernel/vdso32/Makefile b/arch/arm64/kernel/vdso32/Makefile
index 89299a26638b..1407516e041e 100644
--- a/arch/arm64/kernel/vdso32/Makefile
+++ b/arch/arm64/kernel/vdso32/Makefile
@@ -65,13 +65,7 @@ endif
 # From arm vDSO Makefile
 VDSO_CAFLAGS += -fPIC -fno-builtin -fno-stack-protector
 VDSO_CAFLAGS += -DDISABLE_BRANCH_PROFILING
-
-
-# Try to compile for ARMv8. If the compiler is too old and doesn't support it,
-# fall back to v7. There is no easy way to check for what architecture the code
-# is being compiled, so define a macro specifying that (see arch/arm/Makefile).
-VDSO_CAFLAGS += $(call cc32-option,-march=armv8-a -D__LINUX_ARM_ARCH__=8,\
-                                   -march=armv7-a -D__LINUX_ARM_ARCH__=7)
+VDSO_CAFLAGS += -march=armv8-a
 
 VDSO_CFLAGS := $(VDSO_CAFLAGS)
 VDSO_CFLAGS += -DENABLE_COMPAT_VDSO=1
-- 
2.33.0.1079.g6e70778dc9-goog


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  parent reply	other threads:[~2021-10-19 22:38 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-19 22:36 [PATCH v2 0/4] compat vdso cleanups Nick Desaulniers
2021-10-19 22:36 ` [PATCH v2 1/4] arm64: vdso32: drop the test for dmb ishld Nick Desaulniers
2021-10-20  0:42   ` Nathan Chancellor
2021-10-20  7:51   ` Vincenzo Frascino
2021-10-19 22:36 ` Nick Desaulniers [this message]
2021-10-20  0:43   ` [PATCH v2 2/4] arm64: vdso32: drop test for -march=armv8-a Nathan Chancellor
2021-10-20  7:52   ` Vincenzo Frascino
2021-10-19 22:36 ` [PATCH v2 3/4] arm64: vdso32: suppress error message for 'make mrproper' Nick Desaulniers
2021-10-20  0:50   ` Nathan Chancellor
2021-10-20  7:54   ` Vincenzo Frascino
2021-10-19 22:36 ` [PATCH v2 4/4] arm64: vdso32: require CROSS_COMPILE_COMPAT for gcc+bfd Nick Desaulniers
2021-10-20  9:08   ` Vincenzo Frascino
2021-10-21 10:05 ` [PATCH v2 0/4] compat vdso cleanups Will Deacon

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