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Date: Fri, 08 Apr 2011 08:32:28 +0800 From: Huang Ying <ying.huang@...el.com> To: Russell King - ARM Linux <linux@....linux.org.uk> CC: Len Brown <lenb@...nel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Andi Kleen <andi@...stfloor.org>, "Luck, Tony" <tony.luck@...el.com>, "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>, Richard Henderson <rth@...ddle.net>, Mikael Starvik <starvik@...s.com>, David Howells <dhowells@...hat.com>, Yoshinori Sato <ysato@...rs.sourceforge.jp>, Hirokazu Takata <takata@...ux-m32r.org>, Geert Uytterhoeven <geert@...ux-m68k.org>, Michal Simek <monstr@...str.eu>, Ralf Baechle <ralf@...ux-mips.org>, Kyle McMartin <kyle@...artin.ca>, Martin Schwidefsky <schwidefsky@...ibm.com>, Chen Liqin <liqin.chen@...plusct.com>, "David S. Miller" <davem@...emloft.net>, Ingo Molnar <mingo@...hat.com>, Chris Zankel <chris@...kel.net> Subject: Re: [PATCH -v2 1/4] Add Kconfig option ARCH_HAVE_NMI_SAFE_CMPXCHG 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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