From: Huang Ying <ying.huang@intel.com>
To: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: Len Brown <lenb@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Andi Kleen <andi@firstfloor.org>,
"Luck, Tony" <tony.luck@intel.com>,
"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
Richard Henderson <rth@twiddle.net>,
Mikael Starvik <starvik@axis.com>,
David Howells <dhowells@redhat.com>,
Yoshinori Sato <ysato@users.sourceforge.jp>,
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>
Subject: Re: [PATCH -v2 1/4] Add Kconfig option ARCH_HAVE_NMI_SAFE_CMPXCHG
Date: Fri, 08 Apr 2011 08:32:28 +0800 [thread overview]
Message-ID: <4D9E579C.3030101@intel.com> (raw)
In-Reply-To: <20110407173953.GB17049@n2100.arm.linux.org.uk>
On 04/08/2011 01:39 AM, Russell King - ARM Linux wrote:
> On Thu, Apr 07, 2011 at 09:29:03AM +0800, Huang Ying wrote:
>> 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 to 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).
>
> As this no longer touches any ARM code, I thinky you can drop me from the
> CC list. Thanks.
OK. Will do this.
Best Regards,
Huang Ying
next prev parent reply other threads:[~2011-04-08 0:32 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-07 1:29 [PATCH -v2 0/4] ACPI, APEI, GHES, printk support for recoverable error via NMI Huang Ying
2011-04-07 1:29 ` [PATCH -v2 1/4] Add Kconfig option ARCH_HAVE_NMI_SAFE_CMPXCHG Huang Ying
2011-04-07 17:39 ` Russell King - ARM Linux
2011-04-08 0:32 ` Huang Ying [this message]
2011-04-07 1:29 ` [PATCH -v2 2/4] lib, Add lock-less NULL terminated single list Huang Ying
2011-04-07 18:30 ` Mathieu Desnoyers
2011-04-08 1:03 ` Huang Ying
2011-04-07 1:29 ` [PATCH -v2 3/4] lib, Make gen_pool memory allocator lockless Huang Ying
2011-04-07 18:49 ` Mathieu Desnoyers
2011-04-08 1:33 ` Huang Ying
2011-04-07 1:29 ` [PATCH -v2 4/4] ACPI, APEI, GHES, printk support for recoverable error via NMI Huang Ying
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