linux-kernel - [tip:timers/vdso] arm64: compat: No need for pre-ARMv7 barriers on an ARMv8 system

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Date:   Tue, 25 Jun 2019 00:50:31 -0700
From:   tip-bot for Catalin Marinas <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux@...linux.org.uk,
        tglx@...utronix.de, 0x7f454c46@...il.com, salyzyn@...roid.com,
        daniel.lezcano@...aro.org, shuah@...nel.org, paul.burton@...s.com,
        andre.przywara@....com, catalin.marinas@....com,
        sthotton@...vell.com, huw@...eweavers.com, ralf@...ux-mips.org,
        arnd@...db.de, pcc@...gle.com, linux@...musvillemoes.dk,
        hpa@...or.com, mingo@...nel.org, vincenzo.frascino@....com,
        will.deacon@....com
Subject: [tip:timers/vdso] arm64: compat: No need for pre-ARMv7 barriers on
 an ARMv8 system

Commit-ID:  53d87b37a2a4a4b6b0c7f8073c4be04022252e26
Gitweb:     https://git.kernel.org/tip/53d87b37a2a4a4b6b0c7f8073c4be04022252e26
Author:     Catalin Marinas <catalin.marinas@....com>
AuthorDate: Mon, 24 Jun 2019 15:00:19 +0100
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Tue, 25 Jun 2019 09:43:38 +0200

arm64: compat: No need for pre-ARMv7 barriers on an ARMv8 system

Remove the deprecated (pre-ARMv7) compat barriers as they would not be used
on an ARMv8 system.

Fixes: a7f71a2c8903 ("arm64: compat: Add vDSO")
Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Cc: Vincenzo Frascino <vincenzo.frascino@....com>
Cc: linux-arch@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-mips@...r.kernel.org
Cc: linux-kselftest@...r.kernel.org
Cc: Will Deacon <will.deacon@....com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Russell King <linux@...linux.org.uk>
Cc: Ralf Baechle <ralf@...ux-mips.org>
Cc: Paul Burton <paul.burton@...s.com>
Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: Mark Salyzyn <salyzyn@...roid.com>
Cc: Peter Collingbourne <pcc@...gle.com>
Cc: Shuah Khan <shuah@...nel.org>
Cc: Dmitry Safonov <0x7f454c46@...il.com>
Cc: Rasmus Villemoes <linux@...musvillemoes.dk>
Cc: Huw Davies <huw@...eweavers.com>
Cc: Shijith Thotton <sthotton@...vell.com>
Cc: Andre Przywara <andre.przywara@....com>
Link: https://lkml.kernel.org/r/20190624140018.GD29120@arrakis.emea.arm.com
---
 arch/arm64/include/asm/vdso/compat_barrier.h | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/arch/arm64/include/asm/vdso/compat_barrier.h b/arch/arm64/include/asm/vdso/compat_barrier.h
index ea24ea856b07..fb60a88b5ed4 100644
--- a/arch/arm64/include/asm/vdso/compat_barrier.h
+++ b/arch/arm64/include/asm/vdso/compat_barrier.h
@@ -18,14 +18,7 @@
 #undef dmb
 #endif
 
-#if __LINUX_ARM_ARCH__ >= 7
 #define dmb(option) __asm__ __volatile__ ("dmb " #option : : : "memory")
-#elif __LINUX_ARM_ARCH__ == 6
-#define dmb(x) __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" \
-				    : : "r" (0) : "memory")
-#else
-#define dmb(x) __asm__ __volatile__ ("" : : : "memory")
-#endif
 
 #if __LINUX_ARM_ARCH__ >= 8
 #define aarch32_smp_mb()	dmb(ish)