#ifndef _LINUX_U64_STATS_SYNC_H
#define _LINUX_U64_STATS_SYNC_H
#include <linux/seqlock.h>
struct u64_stats_sync {
#if BITS_PER_LONG == 32 && (defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT))
seqcount_t seq;
#endif
};
#if BITS_PER_LONG == 64
#include <asm/local64.h>
typedef struct {
local64_t v;
} u64_stats_t ;
static inline u64 u64_stats_read(const u64_stats_t *p)
{
return local64_read(&p->v);
}
static inline void u64_stats_set(u64_stats_t *p, u64 val)
{
local64_set(&p->v, val);
}
static inline void u64_stats_add(u64_stats_t *p, unsigned long val)
{
local64_add(val, &p->v);
}
static inline void u64_stats_inc(u64_stats_t *p)
{
local64_inc(&p->v);
}
#else
typedef struct {
u64 v;
} u64_stats_t;
static inline u64 u64_stats_read(const u64_stats_t *p)
{
return p->v;
}
static inline void u64_stats_set(u64_stats_t *p, u64 val)
{
p->v = val;
}
static inline void u64_stats_add(u64_stats_t *p, unsigned long val)
{
p->v += val;
}
static inline void u64_stats_inc(u64_stats_t *p)
{
p->v++;
}
#endif
#if BITS_PER_LONG == 32 && (defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT))
#define u64_stats_init(syncp) seqcount_init(&(syncp)->seq)
#else
static inline void u64_stats_init(struct u64_stats_sync *syncp)
{
}
#endif
static inline void u64_stats_update_begin(struct u64_stats_sync *syncp)
{
#if BITS_PER_LONG == 32 && (defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT))
if (IS_ENABLED(CONFIG_PREEMPT_RT))
preempt_disable();
write_seqcount_begin(&syncp->seq);
#endif
}
static inline void u64_stats_update_end(struct u64_stats_sync *syncp)
{
#if BITS_PER_LONG == 32 && (defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT))
write_seqcount_end(&syncp->seq);
if (IS_ENABLED(CONFIG_PREEMPT_RT))
preempt_enable();
#endif
}
static inline unsigned long
u64_stats_update_begin_irqsave(struct u64_stats_sync *syncp)
{
unsigned long flags = 0;
#if BITS_PER_LONG == 32 && (defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT))
if (IS_ENABLED(CONFIG_PREEMPT_RT))
preempt_disable();
else
local_irq_save(flags);
write_seqcount_begin(&syncp->seq);
#endif
return flags;
}
static inline void
u64_stats_update_end_irqrestore(struct u64_stats_sync *syncp,
unsigned long flags)
{
#if BITS_PER_LONG == 32 && (defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT))
write_seqcount_end(&syncp->seq);
if (IS_ENABLED(CONFIG_PREEMPT_RT))
preempt_enable();
else
local_irq_restore(flags);
#endif
}
static inline unsigned int __u64_stats_fetch_begin(const struct u64_stats_sync *syncp)
{
#if BITS_PER_LONG == 32 && (defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT))
return read_seqcount_begin(&syncp->seq);
#else
return 0;
#endif
}
static inline unsigned int u64_stats_fetch_begin(const struct u64_stats_sync *syncp)
{
#if BITS_PER_LONG == 32 && (!defined(CONFIG_SMP) && !defined(CONFIG_PREEMPT_RT))
preempt_disable();
#endif
return __u64_stats_fetch_begin(syncp);
}
static inline bool __u64_stats_fetch_retry(const struct u64_stats_sync *syncp,
unsigned int start)
{
#if BITS_PER_LONG == 32 && (defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT))
return read_seqcount_retry(&syncp->seq, start);
#else
return false;
#endif
}
static inline bool u64_stats_fetch_retry(const struct u64_stats_sync *syncp,
unsigned int start)
{
#if BITS_PER_LONG == 32 && (!defined(CONFIG_SMP) && !defined(CONFIG_PREEMPT_RT))
preempt_enable();
#endif
return __u64_stats_fetch_retry(syncp, start);
}
static inline unsigned int u64_stats_fetch_begin_irq(const struct u64_stats_sync *syncp)
{
#if BITS_PER_LONG == 32 && defined(CONFIG_PREEMPT_RT)
preempt_disable();
#elif BITS_PER_LONG == 32 && !defined(CONFIG_SMP)
local_irq_disable();
#endif
return __u64_stats_fetch_begin(syncp);
}
static inline bool u64_stats_fetch_retry_irq(const struct u64_stats_sync *syncp,
unsigned int start)
{
#if BITS_PER_LONG == 32 && defined(CONFIG_PREEMPT_RT)
preempt_enable();
#elif BITS_PER_LONG == 32 && !defined(CONFIG_SMP)
local_irq_enable();
#endif
return __u64_stats_fetch_retry(syncp, start);
}
#endif /* _LINUX_U64_STATS_SYNC_H */