linux-kernel - [tip:locking/core] locking/lockdep: Map remaining magic numbers to lock usage mask names

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Date:   Thu, 18 Apr 2019 04:26:51 -0700
From:   tip-bot for Frederic Weisbecker <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, peterz@...radead.org, frederic@...nel.org,
        mingo@...nel.org, linux-kernel@...r.kernel.org, tglx@...utronix.de,
        torvalds@...ux-foundation.org, will.deacon@....com,
        akpm@...ux-foundation.org, paulmck@...ux.vnet.ibm.com
Subject: [tip:locking/core] locking/lockdep: Map remaining magic numbers to
 lock usage mask names

Commit-ID:  c902a1e8d9c9b47cd8faa16892710247cdda9b02
Gitweb:     https://git.kernel.org/tip/c902a1e8d9c9b47cd8faa16892710247cdda9b02
Author:     Frederic Weisbecker <frederic@...nel.org>
AuthorDate: Tue, 2 Apr 2019 18:02:42 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 18 Apr 2019 12:50:17 +0200

locking/lockdep: Map remaining magic numbers to lock usage mask names

Clarify the code with mapping some more constant numbers that haven't
been named after their corresponding LOCK_USAGE_* symbol.

Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Will Deacon <will.deacon@....com>
Link: https://lkml.kernel.org/r/20190402160244.32434-3-frederic@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/locking/lockdep.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 9c5819ef4a28..2288aa2fa4c6 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -516,11 +516,11 @@ static char get_usage_char(struct lock_class *class, enum lock_usage_bit bit)
 {
 	char c = '.';
 
-	if (class->usage_mask & lock_flag(bit + 2))
+	if (class->usage_mask & lock_flag(bit + LOCK_USAGE_DIR_MASK))
 		c = '+';
 	if (class->usage_mask & lock_flag(bit)) {
 		c = '-';
-		if (class->usage_mask & lock_flag(bit + 2))
+		if (class->usage_mask & lock_flag(bit + LOCK_USAGE_DIR_MASK))
 			c = '?';
 	}
 
@@ -1971,7 +1971,10 @@ static const char *state_rnames[] = {
 
 static inline const char *state_name(enum lock_usage_bit bit)
 {
-	return (bit & LOCK_USAGE_READ_MASK) ? state_rnames[bit >> 2] : state_names[bit >> 2];
+	if (bit & LOCK_USAGE_READ_MASK)
+		return state_rnames[bit >> LOCK_USAGE_DIR_MASK];
+	else
+		return state_names[bit >> LOCK_USAGE_DIR_MASK];
 }
 
 static int exclusive_bit(int new_bit)
@@ -3017,7 +3020,7 @@ static int (*state_verbose_f[])(struct lock_class *class) = {
 static inline int state_verbose(enum lock_usage_bit bit,
 				struct lock_class *class)
 {
-	return state_verbose_f[bit >> 2](class);
+	return state_verbose_f[bit >> LOCK_USAGE_DIR_MASK](class);
 }
 
 typedef int (*check_usage_f)(struct task_struct *, struct held_lock *,