From: "Aneesh Kumar" I was looking at lockdep-desing.txt and i guess i am confused with the changes with respect to fd7bcea35e7efb108c34ee2b3840942a3749cadb. It says + '.' acquired while irqs enabled + '+' acquired in irq context + '-' acquired in process context with irqs disabled + '?' read-acquired both with irqs enabled and in irq context + But the get_usage_chars() function does this for '-' if (class->usage_mask & LOCKF_ENABLED_HARDIRQS) *c1 = '-'; So i guess what would be correct would be '.' acquired while irqs disabled '+' acquired in irq context '-' acquired with irqs enabled '?' read acquired in irq context with irqs enabled. Acked-by: Ingo Molnar Signed-off-by: Andrew Morton --- Documentation/lockdep-design.txt | 6 +++--- 1 files changed, 3 insertions(+), 3 deletions(-) diff -puN Documentation/lockdep-design.txt~fix-lockdep-designtxt Documentation/lockdep-design.txt --- a/Documentation/lockdep-design.txt~fix-lockdep-designtxt +++ a/Documentation/lockdep-design.txt @@ -50,10 +50,10 @@ The bit position indicates hardirq, soft softirq-read respectively, and the character displayed in each indicates: - '.' acquired while irqs enabled + '.' acquired while irqs disabled '+' acquired in irq context - '-' acquired in process context with irqs disabled - '?' read-acquired both with irqs enabled and in irq context + '-' acquired with irqs enabled + '?' read acquired in irq context with irqs enabled. Unused mutexes cannot be part of the cause of an error. _