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    Subject[PATCH 3/7] HOTPLUG: Adapt thermal throttle to CPU_DYING
    Date
    CPU_DYING is notified in atomic context, so no taking mutexes here.

    Signed-off-by: Avi Kivity <avi@qumranet.com>
    ---
    arch/i386/kernel/cpu/mcheck/therm_throt.c | 6 ++++--
    1 files changed, 4 insertions(+), 2 deletions(-)

    diff --git a/arch/i386/kernel/cpu/mcheck/therm_throt.c b/arch/i386/kernel/cpu/mcheck/therm_throt.c
    index 7ba7c3a..1203dc5 100644
    --- a/arch/i386/kernel/cpu/mcheck/therm_throt.c
    +++ b/arch/i386/kernel/cpu/mcheck/therm_throt.c
    @@ -134,19 +134,21 @@ static __cpuinit int thermal_throttle_cpu_callback(struct notifier_block *nfb,
    int err;

    sys_dev = get_cpu_sysdev(cpu);
    - mutex_lock(&therm_cpu_lock);
    switch (action) {
    case CPU_ONLINE:
    case CPU_ONLINE_FROZEN:
    + mutex_lock(&therm_cpu_lock);
    err = thermal_throttle_add_dev(sys_dev);
    + mutex_unlock(&therm_cpu_lock);
    WARN_ON(err);
    break;
    case CPU_DEAD:
    case CPU_DEAD_FROZEN:
    + mutex_lock(&therm_cpu_lock);
    thermal_throttle_remove_dev(sys_dev);
    + mutex_unlock(&therm_cpu_lock);
    break;
    }
    - mutex_unlock(&therm_cpu_lock);
    return NOTIFY_OK;
    }

    --
    1.5.0.6
    -
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