Merge tag 'f2fs-for-5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs

[linux.git] / include / linux / u64_stats_sync.h

diff --git a/include/linux/u64_stats_sync.h b/include/linux/u64_stats_sync.h
index a27604f99ed044d3492395c0328f41538234d7dc..9de5c10293f593fac6f64458d78f413c3c9fe26c 100644 (file)
--- a/include/linux/u64_stats_sync.h
+++ b/include/linux/u64_stats_sync.h
@@ -40,8 +40,8 @@
  *   spin_lock_bh(...) or other synchronization to get exclusive access
  *   ...
  *   u64_stats_update_begin(&stats->syncp);
- *   stats->bytes64 += len; // non atomic operation
- *   stats->packets64++;    // non atomic operation
+ *   u64_stats_add(&stats->bytes64, len); // non atomic operation
+ *   u64_stats_inc(&stats->packets64);    // non atomic operation
  *   u64_stats_update_end(&stats->syncp);
  *
  * While a consumer (reader) should use following template to get consistent
@@ -52,8 +52,8 @@
  *
  * do {
  *         start = u64_stats_fetch_begin(&stats->syncp);
- *         tbytes = stats->bytes64; // non atomic operation
- *         tpackets = stats->packets64; // non atomic operation
+ *         tbytes = u64_stats_read(&stats->bytes64); // non atomic operation
+ *         tpackets = u64_stats_read(&stats->packets64); // non atomic operation
  * } while (u64_stats_fetch_retry(&stats->syncp, start));
  *
  *
@@ -68,6 +68,49 @@ struct u64_stats_sync {
 #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_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_add(u64_stats_t *p, unsigned long val)
+{
+       p->v += val;
+}
+
+static inline void u64_stats_inc(u64_stats_t *p)
+{
+       p->v++;
+}
+#endif
 
 static inline void u64_stats_init(struct u64_stats_sync *syncp)
 {