From: will.deacon@arm.com (Will Deacon)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/6] arm: Fix in-correct barrier usage in SWP{B} emulation
Date: Tue, 26 Aug 2014 14:04:27 +0100 [thread overview]
Message-ID: <20140826130427.GN23445@arm.com> (raw)
In-Reply-To: <1409048930-21598-2-git-send-email-punit.agrawal@arm.com>
On Tue, Aug 26, 2014 at 11:28:45AM +0100, Punit Agrawal wrote:
> According to the ARM ARMv7, explicit barriers are necessary when using
> synchronisation primitives such as SWP{B}. The use of these
> instructions does not automatically imply a barrier and any ordering
> requirements by the software must be explicitly expressed with the use
> of suitable barriers.
>
> Based on this, remove the barriers from SWP{B} emulation.
>
> Cc: Russell King <linux@arm.linux.org.uk>
> Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
> ---
> arch/arm/kernel/swp_emulate.c | 15 ---------------
> 1 file changed, 15 deletions(-)
Acked-by: Will Deacon <will.deacon@arm.com>
Will
next prev parent reply other threads:[~2014-08-26 13:04 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-26 10:28 [PATCH 0/6] Legacy instruction emulation for arm64 Punit Agrawal
2014-08-26 10:28 ` [PATCH 1/6] arm: Fix in-correct barrier usage in SWP{B} emulation Punit Agrawal
2014-08-26 13:04 ` Will Deacon [this message]
2014-08-27 16:40 ` Catalin Marinas
2014-08-27 17:05 ` Punit Agrawal
2014-08-26 10:28 ` [PATCH 2/6] arm64: Create arch debugfs directory Punit Agrawal
2014-08-26 10:28 ` [PATCH 3/6] arm64: Add support for hooks to handle undefined instructions Punit Agrawal
2014-08-26 13:13 ` Will Deacon
2014-08-26 14:21 ` Ard Biesheuvel
2014-08-26 14:30 ` Will Deacon
2014-08-27 16:47 ` Catalin Marinas
2014-08-27 16:51 ` Will Deacon
2014-08-26 14:56 ` Punit Agrawal
2014-08-26 18:14 ` Will Deacon
2014-08-27 16:58 ` Catalin Marinas
2014-08-26 10:28 ` [PATCH 4/6] arm64: Add AArch32 instruction set condition code checks Punit Agrawal
2014-08-26 10:28 ` [PATCH 5/6] arm64: Port SWP/SWPB emulation support from arm Punit Agrawal
2014-08-26 11:32 ` Arnd Bergmann
2014-08-26 12:25 ` Will Deacon
2014-08-26 13:26 ` Arnd Bergmann
2014-08-26 13:56 ` Will Deacon
2014-08-27 17:35 ` Punit Agrawal
2014-08-27 18:30 ` Arnd Bergmann
2014-08-28 10:21 ` Punit Agrawal
2014-08-27 17:29 ` Catalin Marinas
2014-08-26 10:28 ` [PATCH 6/6] arm64: Emulate CP15 Barrier instructions Punit Agrawal
2014-08-26 13:16 ` Will Deacon
2014-08-27 17:40 ` Catalin Marinas
2014-08-28 9:34 ` Punit Agrawal
2014-08-28 9:42 ` Catalin Marinas
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