2 * Copyright (c) 2017 Oracle and/or its affiliates. All rights reserved.
5 #ifndef _ASM_SPARC_VVAR_DATA_H
6 #define _ASM_SPARC_VVAR_DATA_H
8 #include <asm/clocksource.h>
9 #include <linux/seqlock.h>
10 #include <linux/time.h>
11 #include <linux/types.h>
17 struct { /* extract of a clocksource struct */
23 /* open coded 'struct timespec' */
26 u64 monotonic_time_snsec;
27 u64 monotonic_time_sec;
28 u64 monotonic_time_coarse_sec;
29 u64 monotonic_time_coarse_nsec;
30 u64 wall_time_coarse_sec;
31 u64 wall_time_coarse_nsec;
37 extern struct vvar_data *vvar_data;
38 extern int vdso_fix_stick;
40 static inline unsigned int vvar_read_begin(const struct vvar_data *s)
45 ret = READ_ONCE(s->seq);
46 if (unlikely(ret & 1)) {
50 smp_rmb(); /* Finish all reads before we return seq */
54 static inline int vvar_read_retry(const struct vvar_data *s,
57 smp_rmb(); /* Finish all reads before checking the value of seq */
58 return unlikely(s->seq != start);
61 static inline void vvar_write_begin(struct vvar_data *s)
64 smp_wmb(); /* Makes sure that increment of seq is reflected */
67 static inline void vvar_write_end(struct vvar_data *s)
69 smp_wmb(); /* Makes the value of seq current before we increment */
74 #endif /* _ASM_SPARC_VVAR_DATA_H */