LXR linux/include/linux/win

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/**
   3 * lib/minmax.c: windowed min/max tracker by Kathleen Nichols.
   4 *
   5 */
   6#ifndef MINMAX_H
   7#define MINMAX_H
   8
   9#include <linux/types.h>
  10
  11/* A single data point for our parameterized min-max tracker */
  12struct minmax_sample {
  13        u32     t;      /* time measurement was taken */
  14        u32     v;      /* value measured */
  15};
  16
  17/* State for the parameterized min-max tracker */
  18struct minmax {
  19        struct minmax_sample s[3];
  20};
  21
  22static inline u32 minmax_get(const struct minmax *m)
  23{
  24        return m->s[0].v;
  25}
  26
  27static inline u32 minmax_reset(struct minmax *m, u32 t, u32 meas)
  28{
  29        struct minmax_sample val = { .t = t, .v = meas };
  30
  31        m->s[2] = m->s[1] = m->s[0] = val;
  32        return m->s[0].v;
  33}
  34
  35u32 minmax_running_max(struct minmax *m, u32 win, u32 t, u32 meas);
  36u32 minmax_running_min(struct minmax *m, u32 win, u32 t, u32 meas);
  37
  38#endif
  39