The patch titled
Subject: smp-add-func-to-ipi-cpus-based-on-parameter-func-update
has been added to the -mm tree. Its filename is
smp-add-func-to-ipi-cpus-based-on-parameter-func-update.patch
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From: Gilad Ben-Yossef <gilad@xxxxxxxxxxxxx>
Subject: smp-add-func-to-ipi-cpus-based-on-parameter-func-update
Add the on_each_cpu_cond() function that wraps on_each_cpu_mask()
and calculates the cpumask of cpus to IPI by calling a function supplied
as a parameter in order to determine whether to IPI each specific cpu.
The function works around allocation failure of cpumask variable in
CONFIG_CPUMASK_OFFSTACK=y by itereating over cpus sending an IPI a
time via smp_call_function_single().
The function is useful since it allows to seperate the specific
code that decided in each case whether to IPI a specific cpu for
a specific request from the common boilerplate code of handling
creating the mask, handling failures etc.
Signed-off-by: Gilad Ben-Yossef <gilad@xxxxxxxxxxxxx>
Cc: "Srivatsa S. Bhat" <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/smp.h | 4 ++++
kernel/smp.c | 2 ++
2 files changed, 6 insertions(+)
diff -puN include/linux/smp.h~smp-add-func-to-ipi-cpus-based-on-parameter-func-update include/linux/smp.h
--- a/include/linux/smp.h~smp-add-func-to-ipi-cpus-based-on-parameter-func-update
+++ a/include/linux/smp.h
@@ -162,6 +162,10 @@ static inline int up_smp_call_function(s
local_irq_enable(); \
} \
} while (0)
+/*
+ * Preemption is disabled here to make sure the cond_func is called under the
+ * same condtions in UP and SMP.
+ */
#define on_each_cpu_cond(cond_func, func, info, wait, gfp_flags)\
do { \
preempt_disable(); \
diff -puN kernel/smp.c~smp-add-func-to-ipi-cpus-based-on-parameter-func-update kernel/smp.c
--- a/kernel/smp.c~smp-add-func-to-ipi-cpus-based-on-parameter-func-update
+++ a/kernel/smp.c
@@ -771,6 +771,8 @@ EXPORT_SYMBOL(on_each_cpu_mask);
* The function might sleep if the GFP flags indicates a non
* atomic allocation is allowed.
*
+ * Preemption is disabled to protect against a hotplug event.
+ *
* You must not call this function with disabled interrupts or
* from a hardware interrupt handler or from a bottom half handler.
*/
_
Subject: Subject: smp-add-func-to-ipi-cpus-based-on-parameter-func-update
Patches currently in -mm which might be from gilad@xxxxxxxxxxxxx are
smp-introduce-a-generic-on_each_cpu_mask-function.patch
arm-move-arm-over-to-generic-on_each_cpu_mask.patch
tile-move-tile-to-use-generic-on_each_cpu_mask.patch
smp-add-func-to-ipi-cpus-based-on-parameter-func.patch
smp-add-func-to-ipi-cpus-based-on-parameter-func-fix.patch
smp-add-func-to-ipi-cpus-based-on-parameter-func-update.patch
slub-only-ipi-cpus-that-have-per-cpu-obj-to-flush.patch
fs-only-send-ipi-to-invalidate-lru-bh-when-needed.patch
mm-only-ipi-cpus-to-drain-local-pages-if-they-exist.patch
mm-only-ipi-cpus-to-drain-local-pages-if-they-exist-update.patch
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