From: Huang Ying <ying.huang@intel.com>
To: Len Brown <lenb@kernel.org>
Cc: linux-kernel@vger.kernel.org, Andi Kleen <andi@firstfloor.org>,
Tony Luck <tony.luck@intel.com>,
ying.huang@intel.com, linux-acpi@vger.kernel.org,
Richard Henderson <rth@twiddle.net>,
Russell King <linux@arm.linux.org.uk>,
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: [PATCH -v2 1/4] Add Kconfig option ARCH_HAVE_NMI_SAFE_CMPXCHG
Date: Thu, 7 Apr 2011 09:29:03 +0800 [thread overview]
Message-ID: <1302139746-1030-2-git-send-email-ying.huang@intel.com> (raw)
In-Reply-To: <1302139746-1030-1-git-send-email-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 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).
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: Russell King <linux@arm.linux.org.uk>
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>
---
arch/Kconfig | 3 +++
arch/alpha/Kconfig | 1 +
arch/avr32/Kconfig | 1 +
arch/frv/Kconfig | 1 +
arch/ia64/Kconfig | 1 +
arch/m68k/Kconfig | 1 +
arch/parisc/Kconfig | 1 +
arch/powerpc/Kconfig | 1 +
arch/s390/Kconfig | 1 +
arch/sh/Kconfig | 1 +
arch/sparc/Kconfig | 1 +
arch/tile/Kconfig | 1 +
arch/x86/Kconfig | 1 +
13 files changed, 15 insertions(+)
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -178,4 +178,7 @@ config HAVE_ARCH_JUMP_LABEL
config HAVE_ARCH_MUTEX_CPU_RELAX
bool
+config ARCH_HAVE_NMI_SAFE_CMPXCHG
+ bool
+
source "kernel/gcov/Kconfig"
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -12,6 +12,7 @@ config ALPHA
select GENERIC_IRQ_PROBE
select AUTO_IRQ_AFFINITY if SMP
select GENERIC_IRQ_SHOW
+ select ARCH_HAVE_NMI_SAFE_CMPXCHG
help
The Alpha is a 64-bit general-purpose processor designed and
marketed by the Digital Equipment Corporation of blessed memory,
--- a/arch/avr32/Kconfig
+++ b/arch/avr32/Kconfig
@@ -10,6 +10,7 @@ config AVR32
select GENERIC_IRQ_PROBE
select HARDIRQS_SW_RESEND
select GENERIC_IRQ_SHOW
+ select ARCH_HAVE_NMI_SAFE_CMPXCHG
help
AVR32 is a high-performance 32-bit RISC microprocessor core,
designed for cost-sensitive embedded applications, with particular
--- a/arch/frv/Kconfig
+++ b/arch/frv/Kconfig
@@ -7,6 +7,7 @@ config FRV
select HAVE_PERF_EVENTS
select HAVE_GENERIC_HARDIRQS
select GENERIC_IRQ_SHOW
+ select ARCH_HAVE_NMI_SAFE_CMPXCHG
config ZONE_DMA
bool
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -27,6 +27,7 @@ config IA64
select GENERIC_PENDING_IRQ if SMP
select IRQ_PER_CPU
select GENERIC_IRQ_SHOW
+ select ARCH_HAVE_NMI_SAFE_CMPXCHG
default y
help
The Itanium Processor Family is Intel's 64-bit successor to
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -5,6 +5,7 @@ config M68K
select HAVE_AOUT if MMU
select GENERIC_ATOMIC64 if MMU
select HAVE_GENERIC_HARDIRQS if !MMU
+ select ARCH_HAVE_NMI_SAFE_CMPXCHG if RMW_INSNS
config RWSEM_GENERIC_SPINLOCK
bool
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -15,6 +15,7 @@ config PARISC
select HAVE_GENERIC_HARDIRQS
select GENERIC_IRQ_PROBE
select IRQ_PER_CPU
+ select ARCH_HAVE_NMI_SAFE_CMPXCHG
help
The PA-RISC microprocessor is designed by Hewlett-Packard and used
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -140,6 +140,7 @@ config PPC
select IRQ_PER_CPU
select GENERIC_IRQ_SHOW
select GENERIC_IRQ_SHOW_LEVEL
+ select ARCH_HAVE_NMI_SAFE_CMPXCHG
config EARLY_PRINTK
bool
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -81,6 +81,7 @@ config S390
select INIT_ALL_POSSIBLE
select HAVE_IRQ_WORK
select HAVE_PERF_EVENTS
+ select ARCH_HAVE_NMI_SAFE_CMPXCHG
select HAVE_KERNEL_GZIP
select HAVE_KERNEL_BZIP2
select HAVE_KERNEL_LZMA
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -11,6 +11,7 @@ config SUPERH
select HAVE_DMA_ATTRS
select HAVE_IRQ_WORK
select HAVE_PERF_EVENTS
+ select ARCH_HAVE_NMI_SAFE_CMPXCHG if (GUSA_RB || CPU_SH4A)
select PERF_USE_VMALLOC
select HAVE_KERNEL_GZIP
select HAVE_KERNEL_BZIP2
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -53,6 +53,7 @@ config SPARC64
select HAVE_GENERIC_HARDIRQS
select GENERIC_IRQ_SHOW
select IRQ_PREFLOW_FASTEOI
+ select ARCH_HAVE_NMI_SAFE_CMPXCHG
config ARCH_DEFCONFIG
string
--- a/arch/tile/Kconfig
+++ b/arch/tile/Kconfig
@@ -12,6 +12,7 @@ config TILE
select GENERIC_IRQ_PROBE
select GENERIC_PENDING_IRQ if SMP
select GENERIC_IRQ_SHOW
+ select ARCH_HAVE_NMI_SAFE_CMPXCHG if !M386
# FIXME: investigate whether we need/want these options.
# select HAVE_IOREMAP_PROT
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -72,6 +72,7 @@ config X86
select IRQ_FORCED_THREADING
select USE_GENERIC_SMP_HELPERS if SMP
select ARCH_NO_SYSDEV_OPS
+ select ARCH_HAVE_NMI_SAFE_CMPXCHG
config INSTRUCTION_DECODER
def_bool (KPROBES || PERF_EVENTS)
next prev parent reply other threads:[~2011-04-07 1:29 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 ` Huang Ying [this message]
2011-04-07 17:39 ` [PATCH -v2 1/4] Add Kconfig option ARCH_HAVE_NMI_SAFE_CMPXCHG Russell King - ARM Linux
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
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