Messages in this thread Patch in this message | | | From | Rob Clark <> | Subject | [PATCH v4 5/9] PM / QoS: Teach lockdep about dev_pm_qos_mtx locking order | Date | Mon, 7 Aug 2023 10:11:39 -0700 |
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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 5ec06585b6d1..63cb1086f195 100644 --- a/drivers/base/power/qos.c +++ b/drivers/base/power/qos.c @@ -1017,3 +1017,14 @@ 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); -- 2.41.0
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