Subject: + cpu-hotplug-provide-a-generic-helper-to-disable-enable-cpu-hotplug-v11.patch added to -mm tree
To: srivatsa.bhat@xxxxxxxxxxxxxxxxxx,holt@xxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Mon, 20 May 2013 13:15:25 -0700
The patch titled
Subject: cpu-hotplug-provide-a-generic-helper-to-disable-enable-cpu-hotplug-v11
has been added to the -mm tree. Its filename is
cpu-hotplug-provide-a-generic-helper-to-disable-enable-cpu-hotplug-v11.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: "Srivatsa S. Bhat" <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>
Subject: cpu-hotplug-provide-a-generic-helper-to-disable-enable-cpu-hotplug-v11
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Robin Holt <holt@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/cpu.h | 18 ++++--------------
kernel/cpu.c | 42 +++++++++++++++++++++---------------------
2 files changed, 25 insertions(+), 35 deletions(-)
diff -puN include/linux/cpu.h~cpu-hotplug-provide-a-generic-helper-to-disable-enable-cpu-hotplug-v11 include/linux/cpu.h
--- a/include/linux/cpu.h~cpu-hotplug-provide-a-generic-helper-to-disable-enable-cpu-hotplug-v11
+++ a/include/linux/cpu.h
@@ -168,20 +168,6 @@ static inline void cpu_maps_update_done(
}
#endif /* CONFIG_SMP */
-
-#ifdef CONFIG_PM_SLEEP_SMP
-extern void cpu_hotplug_enable(void);
-extern void cpu_hotplug_disable(void);
-#else
-static inline void cpu_hotplug_enable(void)
-{
-}
-
-static inline void cpu_hotplug_disable(void)
-{
-}
-#endif
-
extern struct bus_type cpu_subsys;
#ifdef CONFIG_HOTPLUG_CPU
@@ -189,6 +175,8 @@ extern struct bus_type cpu_subsys;
extern void get_online_cpus(void);
extern void put_online_cpus(void);
+extern void cpu_hotplug_disable(void);
+extern void cpu_hotplug_enable(void);
#define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri)
#define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
#define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
@@ -212,6 +200,8 @@ static inline void cpu_hotplug_driver_un
#define get_online_cpus() do { } while (0)
#define put_online_cpus() do { } while (0)
+#define cpu_hotplug_disable() do { } while (0)
+#define cpu_hotplug_enable() do { } while (0)
#define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
/* These aren't inline functions due to a GCC bug. */
#define register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
diff -puN kernel/cpu.c~cpu-hotplug-provide-a-generic-helper-to-disable-enable-cpu-hotplug-v11 kernel/cpu.c
--- a/kernel/cpu.c~cpu-hotplug-provide-a-generic-helper-to-disable-enable-cpu-hotplug-v11
+++ a/kernel/cpu.c
@@ -133,6 +133,27 @@ static void cpu_hotplug_done(void)
mutex_unlock(&cpu_hotplug.lock);
}
+/*
+ * Wait for currently running CPU hotplug operations to complete (if any) and
+ * disable future CPU hotplug (from sysfs). The 'cpu_add_remove_lock' protects
+ * the 'cpu_hotplug_disabled' flag. The same lock is also acquired by the
+ * hotplug path before performing hotplug operations. So acquiring that lock
+ * guarantees mutual exclusion from any currently running hotplug operations.
+ */
+void cpu_hotplug_disable(void)
+{
+ cpu_maps_update_begin();
+ cpu_hotplug_disabled = 1;
+ cpu_maps_update_done();
+}
+
+void cpu_hotplug_enable(void)
+{
+ cpu_maps_update_begin();
+ cpu_hotplug_disabled = 0;
+ cpu_maps_update_done();
+}
+
#else /* #if CONFIG_HOTPLUG_CPU */
static void cpu_hotplug_begin(void) {}
static void cpu_hotplug_done(void) {}
@@ -541,27 +562,6 @@ static int __init alloc_frozen_cpus(void
core_initcall(alloc_frozen_cpus);
/*
- * Wait for currently running CPU hotplug operations to complete (if any) and
- * disable future CPU hotplug (from sysfs). The 'cpu_add_remove_lock' protects
- * the 'cpu_hotplug_disabled' flag. The same lock is also acquired by the
- * hotplug path before performing hotplug operations. So acquiring that lock
- * guarantees mutual exclusion from any currently running hotplug operations.
- */
-void cpu_hotplug_disable(void)
-{
- cpu_maps_update_begin();
- cpu_hotplug_disabled = 1;
- cpu_maps_update_done();
-}
-
-void cpu_hotplug_enable(void)
-{
- cpu_maps_update_begin();
- cpu_hotplug_disabled = 0;
- cpu_maps_update_done();
-}
-
-/*
* When callbacks for CPU hotplug notifications are being executed, we must
* ensure that the state of the system with respect to the tasks being frozen
* or not, as reported by the notification, remains unchanged *throughout the
_
Patches currently in -mm which might be from srivatsa.bhat@xxxxxxxxxxxxxxxxxx are
origin.patch
linux-next.patch
cpu-hotplug-provide-a-generic-helper-to-disable-enable-cpu-hotplug.patch
cpu-hotplug-provide-a-generic-helper-to-disable-enable-cpu-hotplug-v11.patch
migrate-shutdown-reboot-to-boot-cpu.patch
lockdep-introduce-lock_acquire_exclusive-shared-helper-macros.patch
lglock-update-lockdep-annotations-to-report-recursive-local-locks.patch
--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
