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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/stop_machine.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/stop_machine.c')
| -rw-r--r-- | kernel/stop_machine.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c index 319821ef78af..51b5ee53571a 100644 --- a/kernel/stop_machine.c +++ b/kernel/stop_machine.c @@ -203,13 +203,13 @@ int stop_machine_run(int (*fn)(void *), void *data, unsigned int cpu) int ret; /* No CPUs can come up or down during this. */ - lock_cpu_hotplug(); + get_online_cpus(); p = __stop_machine_run(fn, data, cpu); if (!IS_ERR(p)) ret = kthread_stop(p); else ret = PTR_ERR(p); - unlock_cpu_hotplug(); + put_online_cpus(); return ret; } |