The patch titled
Handle per-subsystem mutexes for CONFIG_HOTPLUG_CPU not set
has been added to the -mm tree. Its filename is
handle-per-subsystem-mutexes-for-config_hotplug_cpu-not-set.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: Handle per-subsystem mutexes for CONFIG_HOTPLUG_CPU not set
From: Gautham R Shenoy <ego@xxxxxxxxxx>
Provide a common interface for all the subsystems to lock and unlock their
per-subsystem hotcpu mutexes.
When CONFIG_HOTPLUG_CPU is not set, these operations would be no-ops.
Signed-off-by: Gautham R Shenoy <ego@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
include/linux/cpu.h | 15 +++++++++++++++
1 files changed, 15 insertions(+)
diff -puN include/linux/cpu.h~handle-per-subsystem-mutexes-for-config_hotplug_cpu-not-set include/linux/cpu.h
--- a/include/linux/cpu.h~handle-per-subsystem-mutexes-for-config_hotplug_cpu-not-set
+++ a/include/linux/cpu.h
@@ -24,6 +24,7 @@
#include <linux/compiler.h>
#include <linux/cpumask.h>
#include <asm/semaphore.h>
+#include <linux/mutex.h>
struct cpu {
int node_id; /* The node which contains the CPU */
@@ -74,6 +75,17 @@ extern struct sysdev_class cpu_sysdev_cl
#ifdef CONFIG_HOTPLUG_CPU
/* Stop CPUs going up and down. */
+
+static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex)
+{
+ mutex_lock(cpu_hp_mutex);
+}
+
+static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
+{
+ mutex_unlock(cpu_hp_mutex);
+}
+
extern void lock_cpu_hotplug(void);
extern void unlock_cpu_hotplug(void);
#define hotcpu_notifier(fn, pri) { \
@@ -86,6 +98,9 @@ extern void unlock_cpu_hotplug(void);
int cpu_down(unsigned int cpu);
#define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
#else
+#define cpuhotplug_mutex_lock(m) do { (void)(m); } while (0)
+#define cpuhotplug_mutex_unlock(m) do { (void)(m); } while (0)
+
#define lock_cpu_hotplug() do { } while (0)
#define unlock_cpu_hotplug() do { } while (0)
#define lock_cpu_hotplug_interruptible() 0
_
Patches currently in -mm which might be from ego@xxxxxxxxxx are
git-cpufreq.patch
handle-per-subsystem-mutexes-for-config_hotplug_cpu-not-set.patch
handle-per-subsystem-mutexes-for-config_hotplug_cpu-not-set-tidy.patch
extend-notifier_call_chain-to-count-nr_calls-made.patch
extend-notifier_call_chain-to-count-nr_calls-made-fixes.patch
extend-notifier_call_chain-to-count-nr_calls-made-fixes-2.patch
define-and-use-new-eventscpu_lock_acquire-and-cpu_lock_release.patch
define-and-use-new-eventscpu_lock_acquire-and-cpu_lock_release-fix.patch
eliminate-lock_cpu_hotplug-in-kernel-schedc.patch
eliminate-lock_cpu_hotplug-in-kernel-schedc-fix.patch
handle-cpu_lock_acquire-and-cpu_lock_release-in-workqueue_cpu_callback.patch
-
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