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Message-Id: <1293083003-19577-2-git-send-email-ying.huang@intel.com> Date: Thu, 23 Dec 2010 13:43:20 +0800 From: Huang Ying <ying.huang@...el.com> To: Andrew Morton <akpm@...ux-foundation.org> Cc: linux-kernel@...r.kernel.org, Andi Kleen <andi@...stfloor.org>, ying.huang@...el.com, Peter Zijlstra <peterz@...radead.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Ingo Molnar <mingo@...e.hu>, Richard Henderson <rth@...ddle.net>, Russell King <linux@....linux.org.uk>, Mikael Starvik <starvik@...s.com>, David Howells <dhowells@...hat.com>, Yoshinori Sato <ysato@...rs.sourceforge.jp>, Tony Luck <tony.luck@...el.com>, 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: [RFC -v9 1/4] 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 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@...el.com> Acked-by: Mike Frysinger <vapier@...too.org> Acked-by: Paul Mundt <lethal@...ux-sh.org> Acked-by: Hans-Christian Egtvedt <hans-christian.egtvedt@...el.com> Acked-by: Benjamin Herrenschmidt <benh@...nel.crashing.org> Acked-by: Chris Metcalf <cmetcalf@...era.com> CC: Richard Henderson <rth@...ddle.net> CC: Russell King <linux@....linux.org.uk> CC: Mikael Starvik <starvik@...s.com> CC: David Howells <dhowells@...hat.com> CC: Yoshinori Sato <ysato@...rs.sourceforge.jp> CC: Tony Luck <tony.luck@...el.com> CC: Hirokazu Takata <takata@...ux-m32r.org> CC: Geert Uytterhoeven <geert@...ux-m68k.org> CC: Michal Simek <monstr@...str.eu> CC: Ralf Baechle <ralf@...ux-mips.org> CC: Kyle McMartin <kyle@...artin.ca> CC: Martin Schwidefsky <schwidefsky@...ibm.com> CC: Chen Liqin <liqin.chen@...plusct.com> CC: "David S. Miller" <davem@...emloft.net> CC: Ingo Molnar <mingo@...hat.com> CC: Chris Zankel <chris@...kel.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 @@ -175,4 +175,7 @@ config HAVE_PERF_EVENTS_NMI config HAVE_ARCH_JUMP_LABEL bool +config ARCH_HAVE_NMI_SAFE_CMPXCHG + bool + source "kernel/gcov/Kconfig" --- a/arch/alpha/Kconfig +++ b/arch/alpha/Kconfig @@ -7,6 +7,7 @@ config ALPHA select HAVE_SYSCALL_WRAPPERS select HAVE_IRQ_WORK select HAVE_PERF_EVENTS + select ARCH_HAVE_NMI_SAFE_CMPXCHG select HAVE_DMA_ATTRS help The Alpha is a 64-bit general-purpose processor designed and --- a/arch/avr32/Kconfig +++ b/arch/avr32/Kconfig @@ -6,6 +6,7 @@ config AVR32 select HAVE_CLK select HAVE_OPROFILE select HAVE_KPROBES + 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 @@ -5,6 +5,7 @@ config FRV select HAVE_ARCH_TRACEHOOK select HAVE_IRQ_WORK select HAVE_PERF_EVENTS + select ARCH_HAVE_NMI_SAFE_CMPXCHG config ZONE_DMA bool --- a/arch/ia64/Kconfig +++ b/arch/ia64/Kconfig @@ -22,6 +22,7 @@ config IA64 select HAVE_KVM select HAVE_ARCH_TRACEHOOK select HAVE_DMA_API_DEBUG + 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 @@ -4,6 +4,7 @@ config M68K select HAVE_AOUT select HAVE_IDE select GENERIC_ATOMIC64 + select ARCH_HAVE_NMI_SAFE_CMPXCHG if RMW_INSNS config MMU bool --- a/arch/parisc/Kconfig +++ b/arch/parisc/Kconfig @@ -11,6 +11,7 @@ config PARISC select BUG select HAVE_IRQ_WORK select HAVE_PERF_EVENTS + select ARCH_HAVE_NMI_SAFE_CMPXCHG select GENERIC_ATOMIC64 if !64BIT select GENERIC_HARDIRQS_NO__DO_IRQ help --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -138,6 +138,7 @@ config PPC select GENERIC_ATOMIC64 if PPC32 select HAVE_IRQ_WORK select HAVE_PERF_EVENTS + select ARCH_HAVE_NMI_SAFE_CMPXCHG select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_HW_BREAKPOINT if PERF_EVENTS && PPC_BOOK3S_64 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -94,6 +94,7 @@ 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 @@ -22,6 +22,7 @@ config SPARC select RTC_CLASS select RTC_DRV_M48T59 select HAVE_IRQ_WORK + select ARCH_HAVE_NMI_SAFE_CMPXCHG select HAVE_DMA_ATTRS select HAVE_DMA_API_DEBUG select HAVE_ARCH_JUMP_LABEL --- a/arch/tile/Kconfig +++ b/arch/tile/Kconfig @@ -104,6 +104,7 @@ config TILE select GENERIC_FIND_NEXT_BIT select USE_GENERIC_SMP_HELPERS select CC_OPTIMIZE_FOR_SIZE + select ARCH_HAVE_NMI_SAFE_CMPXCHG # FIXME: investigate whether we need/want these options. # select HAVE_IOREMAP_PROT --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -23,6 +23,7 @@ config X86 select HAVE_OPROFILE select HAVE_PERF_EVENTS select HAVE_IRQ_WORK + select ARCH_HAVE_NMI_SAFE_CMPXCHG if !M386 select HAVE_IOREMAP_PROT select HAVE_KPROBES select HAVE_MEMBLOCK -- 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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