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name : win_minmax.h

 /* SPDX-License-Identifier: GPL-2.0 */
/**
 * lib/minmax.c: windowed min/max tracker by Kathleen Nichols.
 *
 */
#ifndef MINMAX_H
#define MINMAX_H

#include <linux/types.h>

/* A single data point for our parameterized min-max tracker */
struct minmax_sample {
	u32	t;	/* time measurement was taken */
	u32	v;	/* value measured */
};

/* State for the parameterized min-max tracker */
struct minmax {
	struct minmax_sample s[3];
};

static inline u32 minmax_get(const struct minmax *m)
{
	return m->s[0].v;
}

static inline u32 minmax_reset(struct minmax *m, u32 t, u32 meas)
{
	struct minmax_sample val = { .t = t, .v = meas };

	m->s[2] = m->s[1] = m->s[0] = val;
	return m->s[0].v;
}

u32 minmax_running_max(struct minmax *m, u32 win, u32 t, u32 meas);
u32 minmax_running_min(struct minmax *m, u32 win, u32 t, u32 meas);

#endif

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