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Subject[PATCH v3 1/5] smp: Introduce a generic on_each_cpu_mask function
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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 <cmetcalf@tilera.com>
CC: Peter Zijlstra <a.p.zijlstra@chello.nl>
CC: Frederic Weisbecker <fweisbec@gmail.com>
CC: Russell King <linux@arm.linux.org.uk>
CC: linux-mm@kvack.org
CC: Christoph Lameter <cl@linux-foundation.org>
CC: Pekka Enberg <penberg@kernel.org>
CC: Matt Mackall <mpm@selenic.com>
CC: Rik van Riel <riel@redhat.com>
CC: Andi Kleen <andi@firstfloor.org>
---
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 db197d6..7c0cbd7 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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