]> err.no Git - linux-2.6/commit
cpu-hotplug: replace lock_cpu_hotplug() with get_online_cpus()
authorGautham R Shenoy <ego@in.ibm.com>
Fri, 25 Jan 2008 20:08:02 +0000 (21:08 +0100)
committerIngo Molnar <mingo@elte.hu>
Fri, 25 Jan 2008 20:08:02 +0000 (21:08 +0100)
commit86ef5c9a8edd78e6bf92879f32329d89b2d55b5a
tree7bf46885326a6fdbb0c3596855408e9a5634dd3a
parentd221938c049f4845da13c8593132595a6b9222a8
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>
15 files changed:
Documentation/cpu-hotplug.txt
arch/mips/kernel/mips-mt-fpaff.c
arch/powerpc/platforms/pseries/hotplug-cpu.c
arch/powerpc/platforms/pseries/rtasd.c
arch/x86/kernel/cpu/mtrr/main.c
arch/x86/kernel/microcode.c
drivers/lguest/x86/core.c
drivers/s390/char/sclp_config.c
include/linux/cpu.h
kernel/cpu.c
kernel/cpuset.c
kernel/rcutorture.c
kernel/sched.c
kernel/stop_machine.c
net/core/flow.c