[PATCH 5.9 385/391] cpufreq: Introduce cpufreq_driver_test_flags()

[Greg Kroah-Hartman]

From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>

commit a62f68f5ca53ab61cba2f0a410d0add7a6d54a52 upstream.

Add a helper function to test the flags of the cpufreq driver in use
againt a given flags mask.

In particular, this will be needed to test the
CPUFREQ_NEED_UPDATE_LIMITS cpufreq driver flag in the schedutil
governor.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/cpufreq/cpufreq.c |   12 ++++++++++++
 include/linux/cpufreq.h   |    1 +
 2 files changed, 13 insertions(+)

--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1904,6 +1904,18 @@ void cpufreq_resume(void)
 }
 
 /**
+ * cpufreq_driver_test_flags - Test cpufreq driver's flags against given ones.
+ * @flags: Flags to test against the current cpufreq driver's flags.
+ *
+ * Assumes that the driver is there, so callers must ensure that this is the
+ * case.
+ */
+bool cpufreq_driver_test_flags(u16 flags)
+{
+	return !!(cpufreq_driver->flags & flags);
+}
+
+/**
  *	cpufreq_get_current_driver - return current driver's name
  *
  *	Return the name string of the currently loaded cpufreq driver
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -428,6 +428,7 @@ struct cpufreq_driver {
 int cpufreq_register_driver(struct cpufreq_driver *driver_data);
 int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
 
+bool cpufreq_driver_test_flags(u16 flags);
 const char *cpufreq_get_current_driver(void);
 void *cpufreq_get_driver_data(void);