Messages in this thread Patch in this message | | | From | Frederic Weisbecker <> | Subject | [RFC PATCH 2/8] irq_work: Let the arch tell us about self-IPI support | Date | Sat, 20 Oct 2012 12:22:41 -0400 |
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This prepares us to make printk working on nohz CPUs using irq work.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> --- arch/alpha/include/asm/irq_work.h | 5 ++++- arch/alpha/kernel/time.c | 2 +- arch/powerpc/include/asm/irq_work.h | 4 +++- arch/powerpc/kernel/time.c | 2 +- arch/sparc/include/asm/irq_work.h | 4 +++- arch/sparc/kernel/pcr.c | 2 +- arch/x86/include/asm/irq_work.h | 9 +++++---- arch/x86/kernel/irq_work.c | 2 +- include/asm-generic/irq_work.h | 14 ++++++++++++++ 9 files changed, 33 insertions(+), 11 deletions(-)
diff --git a/arch/alpha/include/asm/irq_work.h b/arch/alpha/include/asm/irq_work.h index 814ff3d..3d32132 100644 --- a/arch/alpha/include/asm/irq_work.h +++ b/arch/alpha/include/asm/irq_work.h @@ -1,6 +1,9 @@ #ifndef _ALPHA_IRQ_WORK_H #define _ALPHA_IRQ_WORK_H -extern void arch_irq_work_raise(void); +extern void __arch_irq_work_raise(void); +#define arch_irq_work_raise __arch_irq_work_raise + +#include <asm-generic/irq_work.h> #endif diff --git a/arch/alpha/kernel/time.c b/arch/alpha/kernel/time.c index e336694..91c5eec 100644 --- a/arch/alpha/kernel/time.c +++ b/arch/alpha/kernel/time.c @@ -90,7 +90,7 @@ DEFINE_PER_CPU(u8, irq_work_pending); #define test_irq_work_pending() __get_cpu_var(irq_work_pending) #define clear_irq_work_pending() __get_cpu_var(irq_work_pending) = 0 -void arch_irq_work_raise(void) +void __arch_irq_work_raise(void) { set_irq_work_pending_flag(); } diff --git a/arch/powerpc/include/asm/irq_work.h b/arch/powerpc/include/asm/irq_work.h index 8b9927f..8aa36aa 100644 --- a/arch/powerpc/include/asm/irq_work.h +++ b/arch/powerpc/include/asm/irq_work.h @@ -1,6 +1,8 @@ #ifndef _ASM_POWERPC_IRQ_WORK_H #define _ASM_POWERPC_IRQ_WORK_H -extern void arch_irq_work_raise(void); +extern void __arch_irq_work_raise(void); +#define arch_irq_work_raise __arch_irq_work_raise +#include <asm-generic/irq_work.h> #endif diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index c9986fd..31565ac 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -466,7 +466,7 @@ DEFINE_PER_CPU(u8, irq_work_pending); #endif /* 32 vs 64 bit */ -void arch_irq_work_raise(void) +void __arch_irq_work_raise(void) { preempt_disable(); set_irq_work_pending_flag(); diff --git a/arch/sparc/include/asm/irq_work.h b/arch/sparc/include/asm/irq_work.h index 1d062a6..383772d 100644 --- a/arch/sparc/include/asm/irq_work.h +++ b/arch/sparc/include/asm/irq_work.h @@ -1,6 +1,8 @@ #ifndef ___ASM_SPARC_IRQ_H #define ___ASM_SPARC_IRQ_H -extern void arch_irq_work_raise(void); +extern void __arch_irq_work_raise(void); +#define arch_irq_work_raise __arch_irq_work_raise +#include <asm-generic/irq_work.h> #endif diff --git a/arch/sparc/kernel/pcr.c b/arch/sparc/kernel/pcr.c index 269af58..d1e1ecf 100644 --- a/arch/sparc/kernel/pcr.c +++ b/arch/sparc/kernel/pcr.c @@ -43,7 +43,7 @@ void __irq_entry deferred_pcr_work_irq(int irq, struct pt_regs *regs) set_irq_regs(old_regs); } -void arch_irq_work_raise(void) +void __arch_irq_work_raise(void) { set_softint(1 << PIL_DEFERRED_PCR_WORK); } diff --git a/arch/x86/include/asm/irq_work.h b/arch/x86/include/asm/irq_work.h index 38eed96..dad8266 100644 --- a/arch/x86/include/asm/irq_work.h +++ b/arch/x86/include/asm/irq_work.h @@ -1,10 +1,11 @@ #ifndef _ASM_X86_IRQ_WORK_H #define _ASM_X86_IRQ_WORK_H -#ifndef CONFIG_X86_LOCAL_APIC -#include <asm-generic/irq_work.h> -# else -extern void arch_irq_work_raise(void); +#ifdef CONFIG_X86_LOCAL_APIC +extern void __arch_irq_work_raise(void); +#define arch_irq_work_raise __arch_irq_work_raise #endif +#include <asm-generic/irq_work.h> + #endif diff --git a/arch/x86/kernel/irq_work.c b/arch/x86/kernel/irq_work.c index 95f5d4e..7389d5e 100644 --- a/arch/x86/kernel/irq_work.c +++ b/arch/x86/kernel/irq_work.c @@ -19,7 +19,7 @@ void smp_irq_work_interrupt(struct pt_regs *regs) } #ifdef CONFIG_X86_LOCAL_APIC -void arch_irq_work_raise(void) +void __arch_irq_work_raise(void) { if (!cpu_has_apic) return; diff --git a/include/asm-generic/irq_work.h b/include/asm-generic/irq_work.h index a2d4108..e3e4f02 100644 --- a/include/asm-generic/irq_work.h +++ b/include/asm-generic/irq_work.h @@ -4,6 +4,20 @@ /* * Lame architectures will get the timer tick callback */ +#ifndef arch_irq_work_raise static inline void arch_irq_work_raise(void) { } +#endif + +/* + * Unless told otherwise, consider the arch doesn't implement irq work + * using self IPIs but through another way like defaulting to the hook + * on the sched tick. + */ +#ifndef arch_irq_work_has_ipi +static inline bool arch_irq_work_has_ipi(void) +{ + return false; +} +#endif #endif -- 1.7.5.4
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