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Date: Sun, 6 Dec 2020 17:21:42 +0100
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: Linus Torvalds <torvalds@...ux-foundation.org>,
Thomas Gleixner <tglx@...utronix.de>,
"Paul E. McKenney" <paulmck@...nel.org>,
Steven Rostedt <rostedt@...dmis.org>,
Jonathan Corbet <corbet@....net>,
Jason Gunthorpe <jgg@...dia.com>,
John Hubbard <jhubbard@...dia.com>,
LKML <linux-kernel@...r.kernel.org>,
"Sebastian A. Siewior" <bigeasy@...utronix.de>,
"Ahmed S. Darwish" <a.darwish@...utronix.de>
Subject: [PATCH -tip v1 2/3] seqlock: Prefix internal seqcount_t-only macros with a "do_"
When the seqcount_LOCKNAME_t group of data types were introduced, two
classes of seqlock.h sequence counter macros were added:
- An external public API which can either take a plain seqcount_t or
any of the seqcount_LOCKNAME_t variants.
- An internal API which takes only a plain seqcount_t.
To distinguish between the two groups, the "*_seqcount_t_*" pattern was
used for the latter. This confused a number of mm/ call-site developers,
and Linus also commented that it was not a standard practice for marking
seqlock.h internal APIs.
Distinguish the latter group of macros by prefixing a "do_".
Link: https://lkml.kernel.org/r/CAHk-=wgB8nyOQufpn0o6a5BpJCJPnXvH+kRxApujhsgG+7qAwQ@mail.gmail.com
Link: https://lkml.kernel.org/r/CAHk-=wikhGExmprXgaW+MVXG1zsGpztBbVwOb23vetk41EtTBQ@mail.gmail.com
Signed-off-by: Ahmed S. Darwish <a.darwish@...utronix.de>
---
include/linux/seqlock.h | 66 ++++++++++++++++++++---------------------
1 file changed, 33 insertions(+), 33 deletions(-)
diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h
index d89134c74fba..235cbc65fd71 100644
--- a/include/linux/seqlock.h
+++ b/include/linux/seqlock.h
@@ -425,9 +425,9 @@ SEQCOUNT_LOCKNAME(ww_mutex, struct ww_mutex, true, &s->lock->base, ww_mu
* Return: true if a read section retry is required, else false
*/
#define __read_seqcount_retry(s, start) \
- __read_seqcount_t_retry(seqprop_ptr(s), start)
+ do___read_seqcount_retry(seqprop_ptr(s), start)
-static inline int __read_seqcount_t_retry(const seqcount_t *s, unsigned start)
+static inline int do___read_seqcount_retry(const seqcount_t *s, unsigned start)
{
kcsan_atomic_next(0);
return unlikely(READ_ONCE(s->sequence) != start);
@@ -445,12 +445,12 @@ static inline int __read_seqcount_t_retry(const seqcount_t *s, unsigned start)
* Return: true if a read section retry is required, else false
*/
#define read_seqcount_retry(s, start) \
- read_seqcount_t_retry(seqprop_ptr(s), start)
+ do_read_seqcount_retry(seqprop_ptr(s), start)
-static inline int read_seqcount_t_retry(const seqcount_t *s, unsigned start)
+static inline int do_read_seqcount_retry(const seqcount_t *s, unsigned start)
{
smp_rmb();
- return __read_seqcount_t_retry(s, start);
+ return do___read_seqcount_retry(s, start);
}
/**
@@ -462,10 +462,10 @@ do { \
if (seqprop_preemptible(s)) \
preempt_disable(); \
\
- raw_write_seqcount_t_begin(seqprop_ptr(s)); \
+ do_raw_write_seqcount_begin(seqprop_ptr(s)); \
} while (0)
-static inline void raw_write_seqcount_t_begin(seqcount_t *s)
+static inline void do_raw_write_seqcount_begin(seqcount_t *s)
{
kcsan_nestable_atomic_begin();
s->sequence++;
@@ -478,13 +478,13 @@ static inline void raw_write_seqcount_t_begin(seqcount_t *s)
*/
#define raw_write_seqcount_end(s) \
do { \
- raw_write_seqcount_t_end(seqprop_ptr(s)); \
+ do_raw_write_seqcount_end(seqprop_ptr(s)); \
\
if (seqprop_preemptible(s)) \
preempt_enable(); \
} while (0)
-static inline void raw_write_seqcount_t_end(seqcount_t *s)
+static inline void do_raw_write_seqcount_end(seqcount_t *s)
{
smp_wmb();
s->sequence++;
@@ -506,12 +506,12 @@ do { \
if (seqprop_preemptible(s)) \
preempt_disable(); \
\
- write_seqcount_t_begin_nested(seqprop_ptr(s), subclass); \
+ do_write_seqcount_begin_nested(seqprop_ptr(s), subclass); \
} while (0)
-static inline void write_seqcount_t_begin_nested(seqcount_t *s, int subclass)
+static inline void do_write_seqcount_begin_nested(seqcount_t *s, int subclass)
{
- raw_write_seqcount_t_begin(s);
+ do_raw_write_seqcount_begin(s);
seqcount_acquire(&s->dep_map, subclass, 0, _RET_IP_);
}
@@ -533,12 +533,12 @@ do { \
if (seqprop_preemptible(s)) \
preempt_disable(); \
\
- write_seqcount_t_begin(seqprop_ptr(s)); \
+ do_write_seqcount_begin(seqprop_ptr(s)); \
} while (0)
-static inline void write_seqcount_t_begin(seqcount_t *s)
+static inline void do_write_seqcount_begin(seqcount_t *s)
{
- write_seqcount_t_begin_nested(s, 0);
+ do_write_seqcount_begin_nested(s, 0);
}
/**
@@ -549,16 +549,16 @@ static inline void write_seqcount_t_begin(seqcount_t *s)
*/
#define write_seqcount_end(s) \
do { \
- write_seqcount_t_end(seqprop_ptr(s)); \
+ do_write_seqcount_end(seqprop_ptr(s)); \
\
if (seqprop_preemptible(s)) \
preempt_enable(); \
} while (0)
-static inline void write_seqcount_t_end(seqcount_t *s)
+static inline void do_write_seqcount_end(seqcount_t *s)
{
seqcount_release(&s->dep_map, _RET_IP_);
- raw_write_seqcount_t_end(s);
+ do_raw_write_seqcount_end(s);
}
/**
@@ -603,9 +603,9 @@ static inline void write_seqcount_t_end(seqcount_t *s)
* }
*/
#define raw_write_seqcount_barrier(s) \
- raw_write_seqcount_t_barrier(seqprop_ptr(s))
+ do_raw_write_seqcount_barrier(seqprop_ptr(s))
-static inline void raw_write_seqcount_t_barrier(seqcount_t *s)
+static inline void do_raw_write_seqcount_barrier(seqcount_t *s)
{
kcsan_nestable_atomic_begin();
s->sequence++;
@@ -623,9 +623,9 @@ static inline void raw_write_seqcount_t_barrier(seqcount_t *s)
* will complete successfully and see data older than this.
*/
#define write_seqcount_invalidate(s) \
- write_seqcount_t_invalidate(seqprop_ptr(s))
+ do_write_seqcount_invalidate(seqprop_ptr(s))
-static inline void write_seqcount_t_invalidate(seqcount_t *s)
+static inline void do_write_seqcount_invalidate(seqcount_t *s)
{
smp_wmb();
kcsan_nestable_atomic_begin();
@@ -865,9 +865,9 @@ static inline unsigned read_seqretry(const seqlock_t *sl, unsigned start)
}
/*
- * For all seqlock_t write side functions, use write_seqcount_*t*_begin()
- * instead of the generic write_seqcount_begin(). This way, no redundant
- * lockdep_assert_held() checks are added.
+ * For all seqlock_t write side functions, use the the internal
+ * do_write_seqcount_begin() instead of generic write_seqcount_begin().
+ * This way, no redundant lockdep_assert_held() checks are added.
*/
/**
@@ -886,7 +886,7 @@ static inline unsigned read_seqretry(const seqlock_t *sl, unsigned start)
static inline void write_seqlock(seqlock_t *sl)
{
spin_lock(&sl->lock);
- write_seqcount_t_begin(&sl->seqcount.seqcount);
+ do_write_seqcount_begin(&sl->seqcount.seqcount);
}
/**
@@ -898,7 +898,7 @@ static inline void write_seqlock(seqlock_t *sl)
*/
static inline void write_sequnlock(seqlock_t *sl)
{
- write_seqcount_t_end(&sl->seqcount.seqcount);
+ do_write_seqcount_end(&sl->seqcount.seqcount);
spin_unlock(&sl->lock);
}
@@ -912,7 +912,7 @@ static inline void write_sequnlock(seqlock_t *sl)
static inline void write_seqlock_bh(seqlock_t *sl)
{
spin_lock_bh(&sl->lock);
- write_seqcount_t_begin(&sl->seqcount.seqcount);
+ do_write_seqcount_begin(&sl->seqcount.seqcount);
}
/**
@@ -925,7 +925,7 @@ static inline void write_seqlock_bh(seqlock_t *sl)
*/
static inline void write_sequnlock_bh(seqlock_t *sl)
{
- write_seqcount_t_end(&sl->seqcount.seqcount);
+ do_write_seqcount_end(&sl->seqcount.seqcount);
spin_unlock_bh(&sl->lock);
}
@@ -939,7 +939,7 @@ static inline void write_sequnlock_bh(seqlock_t *sl)
static inline void write_seqlock_irq(seqlock_t *sl)
{
spin_lock_irq(&sl->lock);
- write_seqcount_t_begin(&sl->seqcount.seqcount);
+ do_write_seqcount_begin(&sl->seqcount.seqcount);
}
/**
@@ -951,7 +951,7 @@ static inline void write_seqlock_irq(seqlock_t *sl)
*/
static inline void write_sequnlock_irq(seqlock_t *sl)
{
- write_seqcount_t_end(&sl->seqcount.seqcount);
+ do_write_seqcount_end(&sl->seqcount.seqcount);
spin_unlock_irq(&sl->lock);
}
@@ -960,7 +960,7 @@ static inline unsigned long __write_seqlock_irqsave(seqlock_t *sl)
unsigned long flags;
spin_lock_irqsave(&sl->lock, flags);
- write_seqcount_t_begin(&sl->seqcount.seqcount);
+ do_write_seqcount_begin(&sl->seqcount.seqcount);
return flags;
}
@@ -989,7 +989,7 @@ static inline unsigned long __write_seqlock_irqsave(seqlock_t *sl)
static inline void
write_sequnlock_irqrestore(seqlock_t *sl, unsigned long flags)
{
- write_seqcount_t_end(&sl->seqcount.seqcount);
+ do_write_seqcount_end(&sl->seqcount.seqcount);
spin_unlock_irqrestore(&sl->lock, flags);
}
--
2.29.2
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