linux-kernel - [PATCH v2] seqlock: <linux/seqlock.h>: fix multiple kernel-doc warnings

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Date:   Sun, 16 Aug 2020 17:02:00 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH v2] seqlock: <linux/seqlock.h>: fix multiple kernel-doc warnings

Fix kernel-doc warnings in <linux/seqlock.h>.

../include/linux/seqlock.h:152: warning: Incorrect use of kernel-doc format:  * seqcount_LOCKNAME_init() - runtime initializer for seqcount_LOCKNAME_t
../include/linux/seqlock.h:164: warning: Incorrect use of kernel-doc format:  * SEQCOUNT_LOCKTYPE() - Instantiate seqcount_LOCKNAME_t and helpers
../include/linux/seqlock.h:229: warning: Function parameter or member 'seq_name' not described in 'SEQCOUNT_LOCKTYPE_ZERO'
../include/linux/seqlock.h:229: warning: Function parameter or member 'assoc_lock' not described in 'SEQCOUNT_LOCKTYPE_ZERO'
../include/linux/seqlock.h:229: warning: Excess function parameter 'name' description in 'SEQCOUNT_LOCKTYPE_ZERO'
../include/linux/seqlock.h:229: warning: Excess function parameter 'lock' description in 'SEQCOUNT_LOCKTYPE_ZERO'
../include/linux/seqlock.h:695: warning: duplicate section name 'NOTE'

Demote kernel-doc notation for the macros "seqcount_LOCKNAME_init()" and
"SEQCOUNT_LOCKTYPE()"; scripts/kernel-doc does not handle them correctly.

Rename function parameters in SEQCNT_LOCKNAME_ZERO() documentation
to match the macro's argument names. Change the macro name in the
documentation to SEQCOUNT_LOCKTYPE_ZERO() to match the macro's name.

For raw_write_seqcount_latch(), rename the second NOTE: to NOTE2:
to prevent a kernel-doc warning. However, the generated output is not
quite as nice as it could be for this.

Fix a typo: s/LOCKTYPR/LOCKTYPE/

Fixes: 0efc94c5d15c ("seqcount: Compress SEQCNT_LOCKNAME_ZERO()")
Fixes: e4e9ab3f9f91 ("seqlock: Fold seqcount_LOCKNAME_init() definition")
Fixes: a8772dccb2ec ("seqlock: Fold seqcount_LOCKNAME_t definition")
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...nel.org>
Reported-by: kernel test robot <lkp@...el.com>
---
v2: do not move the definition of seqcount_LOCKNAME_init().
Fix build errors reported by kernel test robot.
Actually build a kernel with these changes.

 include/linux/seqlock.h |   13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

--- lnx-59-rc1.orig/include/linux/seqlock.h
+++ lnx-59-rc1/include/linux/seqlock.h
@@ -138,7 +138,7 @@ static inline void seqcount_lockdep_read
 #endif
 
 /**
- * typedef seqcount_LOCKNAME_t - sequence counter with LOCKTYPR associated
+ * typedef seqcount_LOCKNAME_t - sequence counter with LOCKTYPE associated
  * @seqcount:	The real sequence counter
  * @lock:	Pointer to the associated spinlock
  *
@@ -148,7 +148,7 @@ static inline void seqcount_lockdep_read
  * that the write side critical section is properly serialized.
  */
 
-/**
+/*
  * seqcount_LOCKNAME_init() - runtime initializer for seqcount_LOCKNAME_t
  * @s:		Pointer to the seqcount_LOCKNAME_t instance
  * @lock:	Pointer to the associated LOCKTYPE
@@ -173,7 +173,6 @@ seqcount_##lockname##_init(seqcount_##lo
 	seqcount_init(&s->seqcount);					\
 	__SEQ_LOCK(s->lock = lock);					\
 }									\
-									\
 static __always_inline seqcount_t *					\
 __seqcount_##lockname##_ptr(seqcount_##lockname##_t *s)			\
 {									\
@@ -218,9 +217,9 @@ SEQCOUNT_LOCKTYPE(struct mutex,		mutex,
 SEQCOUNT_LOCKTYPE(struct ww_mutex,	ww_mutex,	true,	&s->lock->base)
 
 /**
- * SEQCNT_LOCKNAME_ZERO - static initializer for seqcount_LOCKNAME_t
- * @name:	Name of the seqcount_LOCKNAME_t instance
- * @lock:	Pointer to the associated LOCKTYPE
+ * SEQCOUNT_LOCKTYPE_ZERO - static initializer for seqcount_LOCKNAME_t
+ * @seq_name:	Name of the seqcount_LOCKNAME_t instance
+ * @assoc_lock:	Pointer to the associated LOCKTYPE
  */
 
 #define SEQCOUNT_LOCKTYPE_ZERO(seq_name, assoc_lock) {			\
@@ -688,7 +687,7 @@ static inline int raw_read_seqcount_t_la
  *	to miss an entire modification sequence, once it resumes it might
  *	observe the new entry.
  *
- * NOTE:
+ * NOTE2:
  *
  *	When data is a dynamic data structure; one should use regular RCU
  *	patterns to manage the lifetimes of the objects within.