linux-kernel - [PATCH v1 2/5] seqlock: Use unique prefix for seqcount

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Date:   Fri, 28 Aug 2020 03:07:07 +0200
From:   "Ahmed S. Darwish" <a.darwish@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        "Sebastian A. Siewior" <bigeasy@...utronix.de>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "Ahmed S. Darwish" <a.darwish@...utronix.de>
Subject: [PATCH v1 2/5] 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_LOCKTYPE_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 "__seqcount_t_" as prefix. This
also conforms with the rest of seqlock.h naming conventions.

While at it, also constify the property accessors first parameter where
appropriate.

References: 55f3560df975 ("seqlock: Extend seqcount API with associated locks")
Signed-off-by: Ahmed S. Darwish <a.darwish@...utronix.de>
---
 include/linux/seqlock.h | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h
index 598af597f74e..5470e9cd52ce 100644
--- a/include/linux/seqlock.h
+++ b/include/linux/seqlock.h
@@ -183,13 +183,13 @@ __seqcount_##locktype##_ptr(seqcount_##locktype##_t *s)			\
 }									\
 									\
 static __always_inline bool						\
-__seqcount_##locktype##_preemptible(seqcount_##locktype##_t *s)		\
+__seqcount_##locktype##_preemptible(const seqcount_##locktype##_t *s)	\
 {									\
 	return preemptible;						\
 }									\
 									\
 static __always_inline void						\
-__seqcount_##locktype##_assert(seqcount_##locktype##_t *s)		\
+__seqcount_##locktype##_assert(const seqcount_##locktype##_t *s)	\
 {									\
 	__SEQ_LOCK(lockdep_assert_held(lockmember));			\
 }
@@ -198,17 +198,17 @@ __seqcount_##locktype##_assert(seqcount_##locktype##_t *s)		\
  * __seqprop() for seqcount_t
  */
 
-static inline seqcount_t *__seqcount_ptr(seqcount_t *s)
+static inline seqcount_t *__seqcount_t_ptr(seqcount_t *s)
 {
 	return s;
 }
 
-static inline bool __seqcount_preemptible(seqcount_t *s)
+static inline bool __seqcount_t_preemptible(const seqcount_t *s)
 {
 	return false;
 }
 
-static inline void __seqcount_assert(seqcount_t *s)
+static inline void __seqcount_t_assert(const seqcount_t *s)
 {
 	lockdep_assert_preemption_disabled();
 }
@@ -236,12 +236,11 @@ SEQCOUNT_LOCKTYPE(ww_mutex,	struct ww_mutex,	true,	&s->lock->base)
 #define SEQCNT_MUTEX_ZERO(name, lock)		SEQCOUNT_LOCKTYPE_ZERO(name, lock)
 #define SEQCNT_WW_MUTEX_ZERO(name, lock) 	SEQCOUNT_LOCKTYPE_ZERO(name, lock)
 
-
 #define __seqprop_case(s, locktype, prop)				\
 	seqcount_##locktype##_t: __seqcount_##locktype##_##prop((void *)(s))
 
 #define __seqprop(s, prop) _Generic(*(s),				\
-	seqcount_t:		__seqcount_##prop((void *)(s)),		\
+	seqcount_t:		__seqcount_t_##prop((void *)(s)),	\
 	__seqprop_case((s),	raw_spinlock,	prop),			\
 	__seqprop_case((s),	spinlock,	prop),			\
 	__seqprop_case((s),	rwlock,		prop),			\
-- 
2.28.0