Add Kconfig option ARCH_HAVE_NMI_SAFE_CMPXCHG
commitdf013ffb8119c89f062ab05b7f544704315db47b
authorHuang Ying <ying.huang@intel.com>
Wed, 13 Jul 2011 05:14:22 +0000 (13 13:14 +0800)
committerLen Brown <len.brown@intel.com>
Wed, 3 Aug 2011 15:12:37 +0000 (3 11:12 -0400)
treedb87f30545d2fd6cf9b0a547f09d924df3be90dd
parent9fb0bfe1408d5506b7b83d13d1eed573fd71d67d
Add Kconfig option ARCH_HAVE_NMI_SAFE_CMPXCHG

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>
Acked-by: Richard Henderson <rth@twiddle.net>
CC: Mikael Starvik <starvik@axis.com>
Acked-by: 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>
Acked-by: 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>
13 files changed:
arch/Kconfig
arch/alpha/Kconfig
arch/avr32/Kconfig
arch/frv/Kconfig
arch/ia64/Kconfig
arch/m68k/Kconfig
arch/parisc/Kconfig
arch/powerpc/Kconfig
arch/s390/Kconfig
arch/sh/Kconfig
arch/sparc/Kconfig
arch/tile/Kconfig
arch/x86/Kconfig