flex_proportions: remove unused fprop_local_single

The single variant of flex_proportions is not used.  Simply remove it.

Link: https://lkml.kernel.org/r/20240118201321.759174-1-shikemeng@huaweicloud.comSigned-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/flex_proportions.h

@@ -38,38 +38,6 @@ 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 ----
  */

lib/flex_proportions.c

@@ -83,83 +83,6 @@ bool fprop_new_period(struct fprop_global *p, int periods)
 	return true;
 }
 
-/*
- * ---- SINGLE ----
- */
-
-int fprop_local_init_single(struct fprop_local_single *pl)
-{
-	pl->events = 0;
-	pl->period = 0;
-	raw_spin_lock_init(&pl->lock);
-	return 0;
-}
-
-void fprop_local_destroy_single(struct fprop_local_single *pl)
-{
-}
-
-static void fprop_reflect_period_single(struct fprop_global *p,
-					struct fprop_local_single *pl)
-{
-	unsigned int period = p->period;
-	unsigned long flags;
-
-	/* Fast path - period didn't change */
-	if (pl->period == period)
-		return;
-	raw_spin_lock_irqsave(&pl->lock, flags);
-	/* Someone updated pl->period while we were spinning? */
-	if (pl->period >= period) {
-		raw_spin_unlock_irqrestore(&pl->lock, flags);
-		return;
-	}
-	/* Aging zeroed our fraction? */
-	if (period - pl->period < BITS_PER_LONG)
-		pl->events >>= period - pl->period;
-	else
-		pl->events = 0;
-	pl->period = period;
-	raw_spin_unlock_irqrestore(&pl->lock, flags);
-}
-
-/* Event of type pl happened */
-void __fprop_inc_single(struct fprop_global *p, struct fprop_local_single *pl)
-{
-	fprop_reflect_period_single(p, pl);
-	pl->events++;
-	percpu_counter_add(&p->events, 1);
-}
-
-/* Return fraction of events of type pl */
-void fprop_fraction_single(struct fprop_global *p,
-			   struct fprop_local_single *pl,
-			   unsigned long *numerator, unsigned long *denominator)
-{
-	unsigned int seq;
-	s64 num, den;
-
-	do {
-		seq = read_seqcount_begin(&p->sequence);
-		fprop_reflect_period_single(p, pl);
-		num = pl->events;
-		den = percpu_counter_read_positive(&p->events);
-	} while (read_seqcount_retry(&p->sequence, seq));
-
-	/*
-	 * Make fraction <= 1 and denominator > 0 even in presence of percpu
-	 * counter errors
-	 */
-	if (den <= num) {
-		if (num)
-			den = num;
-		else
-			den = 1;
-	}
-	*denominator = den;
-	*numerator = num;
-}
-
 /*
  * ---- PERCPU ----
  */