From: David Howells <dhowells@redhat.com>
To: Len Brown <lenb@kernel.org>
Cc: dhowells@redhat.com, linux-kernel@vger.kernel.org,
linux-acpi@vger.kernel.org, Huang Ying <ying.huang@intel.com>,
Richard Henderson <rth@twiddle.net>,
Mikael Starvik <starvik@axis.com>,
Yoshinori Sato <ysato@users.sourceforge.jp>,
Tony Luck <tony.luck@intel.com>,
Hirokazu Takata <takata@linux-m32r.org>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Michal Simek <monstr@monstr.eu>,
Ralf Baechle <ralf@linux-mips.org>,
Kyle McMartin <kyle@mcmartin.ca>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Chen Liqin <liqin.chen@sunplusct.com>,
"David S. Miller" <davem@davemloft.net>,
Ingo Molnar <mingo@redhat.com>, Chris Zankel <chris@zankel.net>,
Len Brown <len.brown@intel.com>
Subject: Re: [PATCH 10/19] Add Kconfig option ARCH_HAVE_NMI_SAFE_CMPXCHG
Date: Wed, 03 Aug 2011 09:44:30 +0100 [thread overview]
Message-ID: <5527.1312361070@redhat.com> (raw)
In-Reply-To: <0f579173fd1c9f5dba6703ed8e44a767edf948b5.1312323131.git.len.brown@intel.com>
Len Brown <lenb@kernel.org> wrote:
> From: Huang Ying <ying.huang@intel.com>
>
> cmpxchg() is widely used by lockless code, including NMI-safe lockless
> code. But on some architectures, the cmpxchg() implementation is not
> NMI-safe, on these architectures the lockless code may need a
> spin_trylock_irqsave() based implementation.
>
> This patch adds a Kconfig option: ARCH_HAVE_NMI_SAFE_CMPXCHG, so that
> NMI-safe lockless code can depend on it or provide different
> implementation according to it.
>
> On many architectures, cmpxchg is only NMI-safe for several specific
> operand sizes. So, ARCH_HAVE_NMI_SAFE_CMPXCHG define in this patch
> only guarantees cmpxchg is NMI-safe for sizeof(unsigned long).
>
> Signed-off-by: Huang Ying <ying.huang@intel.com>
> Acked-by: Mike Frysinger <vapier@gentoo.org>
> Acked-by: Paul Mundt <lethal@linux-sh.org>
> Acked-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>
> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Acked-by: Chris Metcalf <cmetcalf@tilera.com>
> CC: Richard Henderson <rth@twiddle.net>
> CC: Mikael Starvik <starvik@axis.com>
> CC: David Howells <dhowells@redhat.com>
> CC: Yoshinori Sato <ysato@users.sourceforge.jp>
> CC: Tony Luck <tony.luck@intel.com>
> CC: Hirokazu Takata <takata@linux-m32r.org>
> CC: Geert Uytterhoeven <geert@linux-m68k.org>
> CC: Michal Simek <monstr@monstr.eu>
> CC: Ralf Baechle <ralf@linux-mips.org>
> CC: Kyle McMartin <kyle@mcmartin.ca>
> CC: Martin Schwidefsky <schwidefsky@de.ibm.com>
> CC: Chen Liqin <liqin.chen@sunplusct.com>
> CC: "David S. Miller" <davem@davemloft.net>
> CC: Ingo Molnar <mingo@redhat.com>
> CC: Chris Zankel <chris@zankel.net>
> Signed-off-by: Len Brown <len.brown@intel.com>
Acked-by: David Howells <dhowells@redhat.com> [FRV]
next prev parent reply other threads:[~2011-08-03 8:47 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-02 22:14 APEI patches for Linux 3.1 Len Brown
2011-08-02 22:14 ` [PATCH 01/19] ACPI, APEI, ERST, Prevent erst_dbg from loading if ERST is disabled Len Brown
2011-08-02 22:14 ` [PATCH 02/19] ACPI, APEI, ERST, Fix erst-dbg long record reading issue Len Brown
2011-08-02 22:14 ` [PATCH 03/19] ACPI, APEI, GHES, Do not ratelimit fatal error printk before panic Len Brown
2011-08-02 22:14 ` [PATCH 04/19] ACPI, APEI, Add apei_exec_run_optional Len Brown
2011-08-02 22:14 ` [PATCH 05/19] ACPI, APEI, Use apei_exec_run_optional in APEI EINJ and ERST Len Brown
2011-08-02 22:14 ` [PATCH 06/19] ACPI, APEI, GHES, Prevent GHES to be built as module Len Brown
2011-08-02 22:14 ` [PATCH 07/19] ACPI, APEI, GHES, Support disable GHES at boot time Len Brown
2011-08-02 22:14 ` [PATCH 08/19] ACPI, APEI, Add APEI bit support in generic _OSC call Len Brown
2011-08-02 22:14 ` [PATCH 09/19] ACPI, APEI, Add WHEA _OSC support Len Brown
2011-08-02 22:14 ` [PATCH 10/19] Add Kconfig option ARCH_HAVE_NMI_SAFE_CMPXCHG Len Brown
2011-08-03 8:44 ` David Howells [this message]
2011-08-03 9:04 ` Ralf Baechle
2011-08-03 15:00 ` Richard Henderson
2011-08-02 22:14 ` [PATCH 11/19] lib, Add lock-less NULL terminated single list Len Brown
2011-08-02 22:14 ` [PATCH 12/19] lib, Make gen_pool memory allocator lockless Len Brown
2011-08-02 22:14 ` [PATCH 13/19] ACPI, APEI, GHES, printk support for recoverable error via NMI Len Brown
2011-08-02 22:14 ` [PATCH 14/19] ACPI, APEI, GHES, Error records content based throttle Len Brown
2011-08-02 22:14 ` [PATCH 15/19] HWPoison: add memory_failure_queue() Len Brown
2011-08-02 22:14 ` [PATCH 16/19] ACPI, APEI, GHES: Add hardware memory error recovery support Len Brown
2011-08-02 22:14 ` [PATCH 17/19] ACPI: APEI build fix Len Brown
2011-08-02 22:14 ` [PATCH 18/19] APEI GHES: 32-bit buildfix Len Brown
2011-08-02 22:14 ` [PATCH 19/19] ACPI, APEI, EINJ Param support is disabled by default Len Brown
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