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| author | Gautham R Shenoy <ego@in.ibm.com> | 2008-01-25 21:08:02 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-25 21:08:02 +0100 |
| commit | 86ef5c9a8edd78e6bf92879f32329d89b2d55b5a (patch) | |
| tree | 7bf46885326a6fdbb0c3596855408e9a5634dd3a /arch/powerpc/platforms/pseries/rtasd.c | |
| parent | d221938c049f4845da13c8593132595a6b9222a8 (diff) | |
| download | blackbird-op-linux-86ef5c9a8edd78e6bf92879f32329d89b2d55b5a.tar.gz blackbird-op-linux-86ef5c9a8edd78e6bf92879f32329d89b2d55b5a.zip | |
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 'arch/powerpc/platforms/pseries/rtasd.c')
| -rw-r--r-- | arch/powerpc/platforms/pseries/rtasd.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/powerpc/platforms/pseries/rtasd.c b/arch/powerpc/platforms/pseries/rtasd.c index 73401c820110..e3078ce41518 100644 --- a/arch/powerpc/platforms/pseries/rtasd.c +++ b/arch/powerpc/platforms/pseries/rtasd.c @@ -382,7 +382,7 @@ static void do_event_scan_all_cpus(long delay) { int cpu; - lock_cpu_hotplug(); + get_online_cpus(); cpu = first_cpu(cpu_online_map); for (;;) { set_cpus_allowed(current, cpumask_of_cpu(cpu)); @@ -390,15 +390,15 @@ static void do_event_scan_all_cpus(long delay) set_cpus_allowed(current, CPU_MASK_ALL); /* Drop hotplug lock, and sleep for the specified delay */ - unlock_cpu_hotplug(); + put_online_cpus(); msleep_interruptible(delay); - lock_cpu_hotplug(); + get_online_cpus(); cpu = next_cpu(cpu, cpu_online_map); if (cpu == NR_CPUS) break; } - unlock_cpu_hotplug(); + put_online_cpus(); } static int rtasd(void *unused) |
