From: olof@lixom•net (Olof Johansson)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 9/9] ARM: Add SWP/SWPB emulation for ARMv7 processors (v5)
Date: Tue, 31 Aug 2010 23:08:01 -0500 [thread overview]
Message-ID: <20100901040801.GA10431@lixom.net> (raw)
In-Reply-To: <20100831135855.21304.5457.stgit@e102109-lin.cambridge.arm.com>
Hi,
On Tue, Aug 31, 2010 at 02:58:56PM +0100, Catalin Marinas wrote:
> From: Leif Lindholm <leif.lindholm@arm•com>
>
> The SWP instruction was deprecated in the ARMv6 architecture, superseded
> by the LDREX/STREX family of instructions for
> load-linked/store-conditional operations. The ARMv7 multiprocessing
> extensions mandate that SWP/SWPB instructions are treated as undefined
> from reset, with the ability to enable them through the System Control
> Register SW bit.
>
> This patch adds the alternative solution to emulate the SWP and SWPB
> instructions using LDREX/STREX sequences, and log statistics to
> /proc/cpu/swp_emulation. To correctly deal with copy-on-write, it also
Sounds like debugfs would be a better place to export this through?
That's what PPC does.
-Olof
next prev parent reply other threads:[~2010-09-01 4:08 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-31 13:57 [PATCH 0/9] Various patches for 2.6.37-rc1 Catalin Marinas
2010-08-31 13:58 ` [PATCH 1/9] ARM: Allow lazy cache flushing via PG_arch_1 for highmem pages Catalin Marinas
2010-08-31 13:58 ` [PATCH 2/9] ARM: Assume new page cache pages have dirty D-cache Catalin Marinas
2010-08-31 13:58 ` [PATCH 3/9] ARM: Introduce __sync_icache_dcache() for VIPT caches Catalin Marinas
2010-08-31 13:58 ` [PATCH 4/9] ARM: Use lazy cache flushing on ARMv7 SMP systems Catalin Marinas
2010-08-31 13:58 ` [PATCH 5/9] ARM: Remove superfluous flush_kernel_dcache_page() Catalin Marinas
2010-08-31 13:58 ` [PATCH 6/9] ARM: Implement phys_mem_access_prot() to avoid attributes aliasing Catalin Marinas
2010-08-31 13:58 ` [PATCH 7/9] ARM: Improve the L2 cache performance when PL310 is used Catalin Marinas
2010-09-13 11:36 ` Russell King - ARM Linux
2010-09-13 11:57 ` Catalin Marinas
2010-08-31 13:58 ` [PATCH 8/9] ARM: Remove the domain switching on ARMv6k/v7 CPUs Catalin Marinas
2010-08-31 13:58 ` [PATCH 9/9] ARM: Add SWP/SWPB emulation for ARMv7 processors (v5) Catalin Marinas
2010-08-31 15:05 ` Kirill A. Shutemov
2010-09-06 15:42 ` Catalin Marinas
2010-09-13 11:55 ` Russell King - ARM Linux
2010-09-14 13:50 ` Leif Lindholm
2010-09-01 4:08 ` Olof Johansson [this message]
2010-09-02 17:04 ` Leif Lindholm
2010-09-02 17:20 ` Olof Johansson
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