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

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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 The bit position indicates STATE, STATE-read, for each of the states listed
above, and the character displayed in each indicates: above, and the character displayed in each indicates:
'.' acquired while irqs disabled '.' acquired while irqs disabled and not in irq context
'+' acquired in irq context '-' acquired in irq context
'-' acquired with irqs enabled '+' acquired with irqs enabled
'?' acquired in irq context with irqs enabled. '?' acquired in irq context with irqs enabled.
Unused mutexes cannot be part of the cause of an error. Unused mutexes cannot be part of the cause of an error.