v4.19.13 snapshot.
diff --git a/include/linux/flex_proportions.h b/include/linux/flex_proportions.h
new file mode 100644
index 0000000..c12df59
--- /dev/null
+++ b/include/linux/flex_proportions.h
@@ -0,0 +1,103 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Floating proportions with flexible aging period
+ *
+ * Copyright (C) 2011, SUSE, Jan Kara <jack@suse.cz>
+ */
+
+#ifndef _LINUX_FLEX_PROPORTIONS_H
+#define _LINUX_FLEX_PROPORTIONS_H
+
+#include <linux/percpu_counter.h>
+#include <linux/spinlock.h>
+#include <linux/seqlock.h>
+#include <linux/gfp.h>
+
+/*
+ * When maximum proportion of some event type is specified, this is the
+ * precision with which we allow limitting. Note that this creates an upper
+ * bound on the number of events per period like
+ * ULLONG_MAX >> FPROP_FRAC_SHIFT.
+ */
+#define FPROP_FRAC_SHIFT 10
+#define FPROP_FRAC_BASE (1UL << FPROP_FRAC_SHIFT)
+
+/*
+ * ---- Global proportion definitions ----
+ */
+struct fprop_global {
+ /* Number of events in the current period */
+ struct percpu_counter events;
+ /* Current period */
+ unsigned int period;
+ /* Synchronization with period transitions */
+ seqcount_t sequence;
+};
+
+int fprop_global_init(struct fprop_global *p, gfp_t gfp);
+void fprop_global_destroy(struct fprop_global *p);
+bool fprop_new_period(struct fprop_global *p, int periods);
+
+/*
+ * ---- SINGLE ----
+ */
+struct fprop_local_single {
+ /* the local events counter */
+ unsigned long events;
+ /* Period in which we last updated events */
+ unsigned int period;
+ raw_spinlock_t lock; /* Protect period and numerator */
+};
+
+#define INIT_FPROP_LOCAL_SINGLE(name) \
+{ .lock = __RAW_SPIN_LOCK_UNLOCKED(name.lock), \
+}
+
+int fprop_local_init_single(struct fprop_local_single *pl);
+void fprop_local_destroy_single(struct fprop_local_single *pl);
+void __fprop_inc_single(struct fprop_global *p, struct fprop_local_single *pl);
+void fprop_fraction_single(struct fprop_global *p,
+ struct fprop_local_single *pl, unsigned long *numerator,
+ unsigned long *denominator);
+
+static inline
+void fprop_inc_single(struct fprop_global *p, struct fprop_local_single *pl)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ __fprop_inc_single(p, pl);
+ local_irq_restore(flags);
+}
+
+/*
+ * ---- PERCPU ----
+ */
+struct fprop_local_percpu {
+ /* the local events counter */
+ struct percpu_counter events;
+ /* Period in which we last updated events */
+ unsigned int period;
+ raw_spinlock_t lock; /* Protect period and numerator */
+};
+
+int fprop_local_init_percpu(struct fprop_local_percpu *pl, gfp_t gfp);
+void fprop_local_destroy_percpu(struct fprop_local_percpu *pl);
+void __fprop_inc_percpu(struct fprop_global *p, struct fprop_local_percpu *pl);
+void __fprop_inc_percpu_max(struct fprop_global *p, struct fprop_local_percpu *pl,
+ int max_frac);
+void fprop_fraction_percpu(struct fprop_global *p,
+ struct fprop_local_percpu *pl, unsigned long *numerator,
+ unsigned long *denominator);
+
+static inline
+void fprop_inc_percpu(struct fprop_global *p, struct fprop_local_percpu *pl)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ __fprop_inc_percpu(p, pl);
+ local_irq_restore(flags);
+}
+
+#endif