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authorAhmed S. Darwish <a.darwish@linutronix.de>2020-09-04 17:32:28 +0200
committerPeter Zijlstra <peterz@infradead.org>2020-09-10 11:19:30 +0200
commit5cdd25572a29e46f932d3e6eedbd07429de66431 (patch)
tree6200c2bb79c64dbec5c839944923e0d37402fdf3
parent6dd699b13d53f26a7603702d8bada3482312df74 (diff)
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seqlock: Use unique prefix for seqcount_t property accessors
At seqlock.h, the following set of functions: - __seqcount_ptr() - __seqcount_preemptible() - __seqcount_assert() act as plain seqcount_t "property" accessors. Meanwhile, the following group: - __seqcount_ptr() - __seqcount_lock_preemptible() - __seqcount_assert_lock_held() act as the equivalent set, but in the generic form, taking either seqcount_t or any of the seqcount_LOCKNAME_t variants. This is quite confusing, especially the first member where it is called exactly the same in both groups. Differentiate the first group by using "__seqprop" as prefix, and also use that same prefix for all of seqcount_LOCKNAME_t property accessors. While at it, constify the property accessors first parameter when appropriate. References: 55f3560df975 ("seqlock: Extend seqcount API with associated locks") Signed-off-by: Ahmed S. Darwish <a.darwish@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20200904153231.11994-3-a.darwish@linutronix.de
-rw-r--r--include/linux/seqlock.h20
1 files changed, 11 insertions, 9 deletions
diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h
index 820ace2f5911..0b4a22f33ac3 100644
--- a/include/linux/seqlock.h
+++ b/include/linux/seqlock.h
@@ -157,7 +157,9 @@ static inline void seqcount_lockdep_reader_access(const seqcount_t *s)
*/
/*
- * SEQCOUNT_LOCKNAME() - Instantiate seqcount_LOCKNAME_t and helpers
+ * SEQCOUNT_LOCKNAME() - Instantiate seqcount_LOCKNAME_t and helpers
+ * seqprop_LOCKNAME_*() - Property accessors for seqcount_LOCKNAME_t
+ *
* @lockname: "LOCKNAME" part of seqcount_LOCKNAME_t
* @locktype: LOCKNAME canonical C data type
* @preemptible: preemptibility of above lockname
@@ -177,19 +179,19 @@ seqcount_##lockname##_init(seqcount_##lockname##_t *s, locktype *lock) \
} \
\
static __always_inline seqcount_t * \
-__seqcount_##lockname##_ptr(seqcount_##lockname##_t *s) \
+__seqprop_##lockname##_ptr(seqcount_##lockname##_t *s) \
{ \
return &s->seqcount; \
} \
\
static __always_inline bool \
-__seqcount_##lockname##_preemptible(seqcount_##lockname##_t *s) \
+__seqprop_##lockname##_preemptible(const seqcount_##lockname##_t *s) \
{ \
return preemptible; \
} \
\
static __always_inline void \
-__seqcount_##lockname##_assert(seqcount_##lockname##_t *s) \
+__seqprop_##lockname##_assert(const seqcount_##lockname##_t *s) \
{ \
__SEQ_LOCK(lockdep_assert_held(lockmember)); \
}
@@ -198,17 +200,17 @@ __seqcount_##lockname##_assert(seqcount_##lockname##_t *s) \
* __seqprop() for seqcount_t
*/
-static inline seqcount_t *__seqcount_ptr(seqcount_t *s)
+static inline seqcount_t *__seqprop_ptr(seqcount_t *s)
{
return s;
}
-static inline bool __seqcount_preemptible(seqcount_t *s)
+static inline bool __seqprop_preemptible(const seqcount_t *s)
{
return false;
}
-static inline void __seqcount_assert(seqcount_t *s)
+static inline void __seqprop_assert(const seqcount_t *s)
{
lockdep_assert_preemption_disabled();
}
@@ -237,10 +239,10 @@ SEQCOUNT_LOCKNAME(ww_mutex, struct ww_mutex, true, &s->lock->base)
#define SEQCNT_WW_MUTEX_ZERO(name, lock) SEQCOUNT_LOCKNAME_ZERO(name, lock)
#define __seqprop_case(s, lockname, prop) \
- seqcount_##lockname##_t: __seqcount_##lockname##_##prop((void *)(s))
+ seqcount_##lockname##_t: __seqprop_##lockname##_##prop((void *)(s))
#define __seqprop(s, prop) _Generic(*(s), \
- seqcount_t: __seqcount_##prop((void *)(s)), \
+ seqcount_t: __seqprop_##prop((void *)(s)), \
__seqprop_case((s), raw_spinlock, prop), \
__seqprop_case((s), spinlock, prop), \
__seqprop_case((s), rwlock, prop), \