[PATCH v2 1/6] smp: Introduce a generic on_each_cpu_mask function
From: Gilad Ben-Yossef <gilad@benyossef.com>
Date: 2011-10-23 15:57:46
Also in:
lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
on_each_cpu_mask calls a function on processors specified my cpumask, which may include the local processor. All the limitation specified in smp_call_function_many apply. Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com> Acked-by: Chris Metcalf <redacted> CC: Peter Zijlstra <redacted> CC: Frederic Weisbecker <redacted> CC: Russell King <redacted> CC: linux-mm@kvack.org CC: Christoph Lameter <redacted> CC: Pekka Enberg <penberg@kernel.org> CC: Matt Mackall <redacted> CC: Sasha Levin <redacted> --- include/linux/smp.h | 16 ++++++++++++++++ kernel/smp.c | 20 ++++++++++++++++++++ 2 files changed, 36 insertions(+), 0 deletions(-)
diff --git a/include/linux/smp.h b/include/linux/smp.h
index 8cc38d3..60628d7 100644
--- a/include/linux/smp.h
+++ b/include/linux/smp.h@@ -102,6 +102,13 @@ static inline void call_function_init(void) { } int on_each_cpu(smp_call_func_t func, void *info, int wait); /* + * Call a function on processors specified by mask, which might include + * the local one. + */ +void on_each_cpu_mask(const struct cpumask *mask, void (*func)(void *), + void *info, bool wait); + +/* * Mark the boot cpu "online" so that it can call console drivers in * printk() and can access its per-cpu storage. */
@@ -132,6 +139,15 @@ static inline int up_smp_call_function(smp_call_func_t func, void *info) local_irq_enable(); \ 0; \ }) +#define on_each_cpu_mask(mask, func, info, wait) \ + do { \ + if (cpumask_test_cpu(0, (mask))) { \ + local_irq_disable(); \ + (func)(info); \ + local_irq_enable(); \ + } \ + } while (0) + static inline void smp_send_reschedule(int cpu) { } #define num_booting_cpus() 1 #define smp_prepare_boot_cpu() do {} while (0)
diff --git a/kernel/smp.c b/kernel/smp.c
index fb67dfa..df37c08 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c@@ -701,3 +701,23 @@ int on_each_cpu(void (*func) (void *info), void *info, int wait) return ret; } EXPORT_SYMBOL(on_each_cpu); + +/* + * Call a function on processors specified by cpumask, which may include + * the local processor. All the limitation specified in smp_call_function_many + * apply. + */ +void on_each_cpu_mask(const struct cpumask *mask, void (*func)(void *), + void *info, bool wait) +{ + int cpu = get_cpu(); + + smp_call_function_many(mask, func, info, wait); + if (cpumask_test_cpu(cpu, mask)) { + local_irq_disable(); + func(info); + local_irq_enable(); + } + put_cpu(); +} +EXPORT_SYMBOL(on_each_cpu_mask);
--
1.7.0.4
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