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-rw-r--r--tools/perf/util/evlist.c12
-rw-r--r--tools/perf/util/evlist.h3
2 files changed, 8 insertions, 7 deletions
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 7ec1bf93ab28..dc1dc2c181ef 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -700,14 +700,14 @@ static bool perf_mmap__empty(struct perf_mmap *md)
static void perf_evlist__mmap_get(struct perf_evlist *evlist, int idx)
{
- ++evlist->mmap[idx].refcnt;
+ atomic_inc(&evlist->mmap[idx].refcnt);
}
static void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx)
{
- BUG_ON(evlist->mmap[idx].refcnt == 0);
+ BUG_ON(atomic_read(&evlist->mmap[idx].refcnt) == 0);
- if (--evlist->mmap[idx].refcnt == 0)
+ if (atomic_dec_and_test(&evlist->mmap[idx].refcnt))
__perf_evlist__munmap(evlist, idx);
}
@@ -721,7 +721,7 @@ void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx)
perf_mmap__write_tail(md, old);
}
- if (md->refcnt == 1 && perf_mmap__empty(md))
+ if (atomic_read(&md->refcnt) == 1 && perf_mmap__empty(md))
perf_evlist__mmap_put(evlist, idx);
}
@@ -758,7 +758,7 @@ static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx)
if (evlist->mmap[idx].base != NULL) {
munmap(evlist->mmap[idx].base, evlist->mmap_len);
evlist->mmap[idx].base = NULL;
- evlist->mmap[idx].refcnt = 0;
+ atomic_set(&evlist->mmap[idx].refcnt, 0);
}
auxtrace_mmap__munmap(&evlist->mmap[idx].auxtrace_mmap);
}
@@ -807,7 +807,7 @@ static int __perf_evlist__mmap(struct perf_evlist *evlist, int idx,
* evlist layer can't just drop it when filtering events in
* perf_evlist__filter_pollfd().
*/
- evlist->mmap[idx].refcnt = 2;
+ atomic_set(&evlist->mmap[idx].refcnt, 2);
evlist->mmap[idx].prev = 0;
evlist->mmap[idx].mask = mp->mask;
evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, mp->prot,
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index c07b1a94a724..670e7f2114b1 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -1,6 +1,7 @@
#ifndef __PERF_EVLIST_H
#define __PERF_EVLIST_H 1
+#include <linux/atomic.h>
#include <linux/list.h>
#include <api/fd/array.h>
#include <stdio.h>
@@ -27,7 +28,7 @@ struct record_opts;
struct perf_mmap {
void *base;
int mask;
- int refcnt;
+ atomic_t refcnt;
u64 prev;
struct auxtrace_mmap auxtrace_mmap;
char event_copy[PERF_SAMPLE_MAX_SIZE] __attribute__((aligned(8)));