s390/pai: rename structure member users to active_events

Rename structure member users to active_events to make it consistent
with PMU pai_ext. Also use the same prefix syntax for increment and
decrement operators in both PMUs.
Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Acked-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

arch/s390/kernel/perf_pai_crypto.c

@@ -35,7 +35,7 @@ struct pai_userdata {
 struct paicrypt_map {
 	unsigned long *page;		/* Page for CPU to store counters */
 	struct pai_userdata *save;	/* Page to store no-zero counters */
-	unsigned int users;		/* # of PAI crypto users */
+	unsigned int active_events;	/* # of PAI crypto users */
 	unsigned int refcnt;		/* Reference count mapped buffers */
 	enum paievt_mode mode;		/* Type of event */
 	struct perf_event *event;	/* Perf event for sampling */
@@ -58,8 +58,8 @@ static void paicrypt_event_destroy(struct perf_event *event)
 	mutex_lock(&pai_reserve_mutex);
 	debug_sprintf_event(cfm_dbg, 5, "%s event %#llx cpu %d users %d"
 			    " mode %d refcnt %d\n", __func__,
-			    event->attr.config, event->cpu, cpump->users,
-			    cpump->mode, cpump->refcnt);
+			    event->attr.config, event->cpu,
+			    cpump->active_events, cpump->mode, cpump->refcnt);
 	if (!--cpump->refcnt) {
 		debug_sprintf_event(cfm_dbg, 4, "%s page %#lx save %p\n",
 				    __func__, (unsigned long)cpump->page,
@@ -174,7 +174,7 @@ static int paicrypt_busy(struct perf_event_attr *a, struct paicrypt_map *cpump)
 	}
 	debug_sprintf_event(cfm_dbg, 5, "%s sample_period %#llx users %d"
 			    " mode %d refcnt %d page %#lx save %p rc %d\n",
-			    __func__, a->sample_period, cpump->users,
+			    __func__, a->sample_period, cpump->active_events,
 			    cpump->mode, cpump->refcnt,
 			    (unsigned long)cpump->page, cpump->save, rc);
 	mutex_unlock(&pai_reserve_mutex);
@@ -260,7 +260,7 @@ static int paicrypt_add(struct perf_event *event, int flags)
 	struct paicrypt_map *cpump = this_cpu_ptr(&paicrypt_map);
 	unsigned long ccd;
 
-	if (cpump->users++ == 0) {
+	if (++cpump->active_events == 1) {
 		ccd = virt_to_phys(cpump->page) | PAI_CRYPTO_KERNEL_OFFSET;
 		WRITE_ONCE(S390_lowcore.ccd, ccd);
 		__ctl_set_bit(0, 50);
@@ -291,7 +291,7 @@ static void paicrypt_del(struct perf_event *event, int flags)
 	if (!event->attr.sample_period)
 		/* Only counting needs to read counter */
 		paicrypt_stop(event, PERF_EF_UPDATE);
-	if (cpump->users-- == 1) {
+	if (--cpump->active_events == 0) {
 		__ctl_clear_bit(0, 50);
 		WRITE_ONCE(S390_lowcore.ccd, 0);
 	}