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| author | Gautham R Shenoy <ego@in.ibm.com> | 2008-01-25 23:08:02 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-25 23:08:02 +0300 |
| commit | 86ef5c9a8edd78e6bf92879f32329d89b2d55b5a (patch) | |
| tree | 7bf46885326a6fdbb0c3596855408e9a5634dd3a /kernel/cpu.c | |
| parent | d221938c049f4845da13c8593132595a6b9222a8 (diff) | |
| download | linux-86ef5c9a8edd78e6bf92879f32329d89b2d55b5a.tar.xz | |
cpu-hotplug: replace lock_cpu_hotplug() with get_online_cpus()
Replace all lock_cpu_hotplug/unlock_cpu_hotplug from the kernel and use
get_online_cpus and put_online_cpus instead as it highlights the
refcount semantics in these operations.
The new API guarantees protection against the cpu-hotplug operation, but
it doesn't guarantee serialized access to any of the local data
structures. Hence the changes needs to be reviewed.
In case of pseries_add_processor/pseries_remove_processor, use
cpu_maps_update_begin()/cpu_maps_update_done() as we're modifying the
cpu_present_map there.
Signed-off-by: Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/cpu.c')
| -rw-r--r-- | kernel/cpu.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c index 656dc3fcbbae..b0c4152995f8 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -48,7 +48,7 @@ void __init cpu_hotplug_init(void) #ifdef CONFIG_HOTPLUG_CPU -void lock_cpu_hotplug(void) +void get_online_cpus(void) { might_sleep(); if (cpu_hotplug.active_writer == current) @@ -58,9 +58,9 @@ void lock_cpu_hotplug(void) mutex_unlock(&cpu_hotplug.lock); } -EXPORT_SYMBOL_GPL(lock_cpu_hotplug); +EXPORT_SYMBOL_GPL(get_online_cpus); -void unlock_cpu_hotplug(void) +void put_online_cpus(void) { if (cpu_hotplug.active_writer == current) return; @@ -73,7 +73,7 @@ void unlock_cpu_hotplug(void) mutex_unlock(&cpu_hotplug.lock); } -EXPORT_SYMBOL_GPL(unlock_cpu_hotplug); +EXPORT_SYMBOL_GPL(put_online_cpus); #endif /* CONFIG_HOTPLUG_CPU */ @@ -110,7 +110,7 @@ void cpu_maps_update_done(void) * non zero and goes to sleep again. * * However, this is very difficult to achieve in practice since - * lock_cpu_hotplug() not an api which is called all that often. + * get_online_cpus() not an api which is called all that often. * */ static void cpu_hotplug_begin(void) |