From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Huang Ying <ying.huang@intel.com>
Cc: Len Brown <lenb@kernel.org>,
linux-kernel@vger.kernel.org, Andi Kleen <andi@firstfloor.org>,
Tony Luck <tony.luck@intel.com>,
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: Thu, 7 Apr 2011 18:39:53 +0100 [thread overview]
Message-ID: <20110407173953.GB17049@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <1302139746-1030-2-git-send-email-ying.huang@intel.com>
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.
next prev parent reply other threads:[~2011-04-07 17:40 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 [this message]
2011-04-08 0:32 ` Huang Ying
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20110407173953.GB17049@n2100.arm.linux.org.uk \
--to=linux@arm.linux.org.uk \
--cc=andi@firstfloor.org \
--cc=chris@zankel.net \
--cc=davem@davemloft.net \
--cc=dhowells@redhat.com \
--cc=geert@linux-m68k.org \
--cc=kyle@mcmartin.ca \
--cc=lenb@kernel.org \
--cc=linux-acpi@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=liqin.chen@sunplusct.com \
--cc=mingo@redhat.com \
--cc=monstr@monstr.eu \
--cc=ralf@linux-mips.org \
--cc=rth@twiddle.net \
--cc=schwidefsky@de.ibm.com \
--cc=starvik@axis.com \
--cc=takata@linux-m32r.org \
--cc=tony.luck@intel.com \
--cc=ying.huang@intel.com \
--cc=ysato@users.sourceforge.jp \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®