linux-kernel - [PATCH] Documentation:lockdep-design: fix note of state bits

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Date:	Fri, 24 Apr 2009 23:10:06 +0800
From:	tom.leiming@...il.com
To:	mingo@...e.hu, akpm@...l.org
Cc:	linux-kernel@...r.kernel.org, Ming Lei <tom.leiming@...il.com>
Subject: [PATCH] Documentation:lockdep-design: fix note of state bits

From: Ming Lei <tom.leiming@...il.com>

>From source code of get_usage_char(), the previous note is not correct,
so fix it.

static char get_usage_char(struct lock_class *class, enum lock_usage_bit bit)
{
	char c = '.';

	if (class->usage_mask & lock_flag(bit + 2))/*LOCK_ENABLED_##STATE*/
		c = '+';
	if (class->usage_mask & lock_flag(bit)) {/*LOCK_USED_IN_##STATE*/
		c = '-';
		if (class->usage_mask & lock_flag(bit + 2))
			c = '?';
	}

	return c;
}
note:
1),The 'bit' parameter always is passed as  LOCK_USED_IN_##STATE
or LOCK_USED_IN_##STATE_READ , from get_usage_chars().

Signed-off-by: Ming Lei <tom.leiming@...il.com>
---
 Documentation/lockdep-design.txt |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Documentation/lockdep-design.txt b/Documentation/lockdep-design.txt
index 938ea22..e20d913 100644
--- a/Documentation/lockdep-design.txt
+++ b/Documentation/lockdep-design.txt
@@ -54,9 +54,9 @@ locking error messages, inside curlies. A contrived example:
 The bit position indicates STATE, STATE-read, for each of the states listed
 above, and the character displayed in each indicates:
 
-   '.'  acquired while irqs disabled
-   '+'  acquired in irq context
-   '-'  acquired with irqs enabled
+   '.'  acquired while irqs disabled and not in irq context
+   '-'  acquired in irq context
+   '+'  acquired with irqs enabled
    '?'  acquired in irq context with irqs enabled.
 
 Unused mutexes cannot be part of the cause of an error.
-- 
1.6.0.GIT

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