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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-22 21:18:12 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-22 21:18:12 -0700 |
| commit | 31950eb66ff47c946fd9c65c2f8c94b6b7ba13fc (patch) | |
| tree | 1ab1e09bbe7a0b33bbf19dd725172827bac5bb88 | |
| parent | ac1b7c378ef26fba6694d5f118fe7fc16fee2fe2 (diff) | |
| download | op-kernel-dev-31950eb66ff47c946fd9c65c2f8c94b6b7ba13fc.zip op-kernel-dev-31950eb66ff47c946fd9c65c2f8c94b6b7ba13fc.tar.gz | |
mm/init: cpu_hotplug_init() must be initialized before SLAB
SLAB uses get/put_online_cpus() which use a mutex which is itself only
initialized when cpu_hotplug_init() is called. Currently we hang suring
boot in SLAB due to doing that too late.
Reported by James Bottomley and Sachin Sant (and possibly others).
Debugged by Benjamin Herrenschmidt.
This just removes the dynamic initialization of the data structures, and
replaces it with a static one, avoiding this dependency entirely, and
removing one unnecessary special initcall.
Tested-by: Sachin Sant <sachinp@in.ibm.com>
Tested-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Tested-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/linux/cpu.h | 5 | ||||
| -rw-r--r-- | init/main.c | 1 | ||||
| -rw-r--r-- | kernel/cpu.c | 13 |
3 files changed, 5 insertions, 14 deletions
diff --git a/include/linux/cpu.h b/include/linux/cpu.h index 2643d84..4d668e0 100644 --- a/include/linux/cpu.h +++ b/include/linux/cpu.h @@ -69,7 +69,6 @@ static inline void unregister_cpu_notifier(struct notifier_block *nb) int cpu_up(unsigned int cpu); void notify_cpu_starting(unsigned int cpu); -extern void cpu_hotplug_init(void); extern void cpu_maps_update_begin(void); extern void cpu_maps_update_done(void); @@ -84,10 +83,6 @@ static inline void unregister_cpu_notifier(struct notifier_block *nb) { } -static inline void cpu_hotplug_init(void) -{ -} - static inline void cpu_maps_update_begin(void) { } diff --git a/init/main.c b/init/main.c index 09131ec..4870dfe 100644 --- a/init/main.c +++ b/init/main.c @@ -678,7 +678,6 @@ asmlinkage void __init start_kernel(void) #endif page_cgroup_init(); enable_debug_pagealloc(); - cpu_hotplug_init(); kmemtrace_init(); kmemleak_init(); debug_objects_mem_init(); diff --git a/kernel/cpu.c b/kernel/cpu.c index 395b697..8ce1004 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -34,14 +34,11 @@ static struct { * an ongoing cpu hotplug operation. */ int refcount; -} cpu_hotplug; - -void __init cpu_hotplug_init(void) -{ - cpu_hotplug.active_writer = NULL; - mutex_init(&cpu_hotplug.lock); - cpu_hotplug.refcount = 0; -} +} cpu_hotplug = { + .active_writer = NULL, + .lock = __MUTEX_INITIALIZER(cpu_hotplug.lock), + .refcount = 0, +}; #ifdef CONFIG_HOTPLUG_CPU |
