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    Subject[PATCH 10/13] PM / QoS: Teach lockdep about dev_pm_qos_mtx locking order
    Date
    From: Rob Clark <robdclark@chromium.org>

    Annotate dev_pm_qos_mtx to teach lockdep to scream about allocations
    that could trigger reclaim under dev_pm_qos_mtx.

    Signed-off-by: Rob Clark <robdclark@chromium.org>
    ---
    drivers/base/power/qos.c | 11 +++++++++++
    1 file changed, 11 insertions(+)

    diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c
    index 9cba334b3729..d4addda3944a 100644
    --- a/drivers/base/power/qos.c
    +++ b/drivers/base/power/qos.c
    @@ -1012,3 +1012,14 @@ void dev_pm_qos_hide_latency_tolerance(struct device *dev)
    pm_runtime_put(dev);
    }
    EXPORT_SYMBOL_GPL(dev_pm_qos_hide_latency_tolerance);
    +
    +static int __init dev_pm_qos_init(void)
    +{
    + /* Teach lockdep about lock ordering wrt. shrinker: */
    + fs_reclaim_acquire(GFP_KERNEL);
    + might_lock(&dev_pm_qos_mtx);
    + fs_reclaim_release(GFP_KERNEL);
    +
    + return 0;
    +}
    +early_initcall(dev_pm_qos_init);
    --
    2.39.2
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