From: Nathan Chancellor <nathan@kernel.org> To: Nick Desaulniers <ndesaulniers@google.com> Cc: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>, llvm@lists.linux.dev, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Vincenzo Frascino <vincenzo.frascino@arm.com>, Arnd Bergmann <arnd@arndb.de> Subject: Re: [PATCH v2 2/4] arm64: vdso32: drop test for -march=armv8-a Date: Tue, 19 Oct 2021 17:43:51 -0700 [thread overview] Message-ID: <YW9mRwwaUmKW8hmL@archlinux-ax161> (raw) In-Reply-To: <20211019223646.1146945-3-ndesaulniers@google.com> On Tue, Oct 19, 2021 at 03:36:44PM -0700, Nick Desaulniers wrote: > 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> Reviewed-by: Nathan Chancellor <nathan@kernel.org> > --- > 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 > >
WARNING: multiple messages have this Message-ID (diff)
From: Nathan Chancellor <nathan@kernel.org> To: Nick Desaulniers <ndesaulniers@google.com> Cc: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>, llvm@lists.linux.dev, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Vincenzo Frascino <vincenzo.frascino@arm.com>, Arnd Bergmann <arnd@arndb.de> Subject: Re: [PATCH v2 2/4] arm64: vdso32: drop test for -march=armv8-a Date: Tue, 19 Oct 2021 17:43:51 -0700 [thread overview] Message-ID: <YW9mRwwaUmKW8hmL@archlinux-ax161> (raw) In-Reply-To: <20211019223646.1146945-3-ndesaulniers@google.com> On Tue, Oct 19, 2021 at 03:36:44PM -0700, Nick Desaulniers wrote: > 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> Reviewed-by: Nathan Chancellor <nathan@kernel.org> > --- > 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 > > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-10-20 0:43 UTC|newest] Thread overview: 26+ 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 ` Nick Desaulniers 2021-10-19 22:36 ` [PATCH v2 1/4] arm64: vdso32: drop the test for dmb ishld Nick Desaulniers 2021-10-19 22:36 ` Nick Desaulniers 2021-10-20 0:42 ` Nathan Chancellor 2021-10-20 0:42 ` Nathan Chancellor 2021-10-20 7:51 ` Vincenzo Frascino 2021-10-20 7:51 ` Vincenzo Frascino 2021-10-19 22:36 ` [PATCH v2 2/4] arm64: vdso32: drop test for -march=armv8-a Nick Desaulniers 2021-10-19 22:36 ` Nick Desaulniers 2021-10-20 0:43 ` Nathan Chancellor [this message] 2021-10-20 0:43 ` Nathan Chancellor 2021-10-20 7:52 ` Vincenzo Frascino 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 2021-10-19 22:36 ` Nick Desaulniers 2021-10-20 0:50 ` Nathan Chancellor 2021-10-20 0:50 ` Nathan Chancellor 2021-10-20 7:54 ` Vincenzo Frascino 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 2021-10-19 22:36 ` Nick Desaulniers 2021-10-20 9:08 ` Vincenzo Frascino 2021-10-20 9:08 ` Vincenzo Frascino 2021-10-21 10:05 ` [PATCH v2 0/4] compat vdso cleanups Will Deacon 2021-10-21 10:05 ` Will Deacon
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