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locking: Documentation: lockdep-design.txt, fix note of state bits 

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@gmail.com>
LKML-Reference: <1240585806-5744-1-git-send-email-tom.leiming@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ming Lei 2009-04-24 23:10:06 +08:00 committed by Ingo Molnar
parent b48ccb095a
commit 992d7ced75
1 changed files with 3 additions and 3 deletions
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6
Documentation/lockdep-design.txt
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@ -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.