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tracing/core: Add current context on tracing recursion warning

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In case of tracing recursion detection, we only get the stacktrace.
But the current context may be very useful to debug the issue.

This patch adds the softirq/hardirq/nmi context with the warning
using lockdep context display to have a familiar output.

v2: Use printk_once()
v3: drop {hardirq,softirq}_context which depend on lockdep,
    only keep what is part of current->trace_recursion,
    sufficient to debug the warning source.

[ Impact: print context necessary to debug recursion ]

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Frederic Weisbecker 2009-04-19 23:38:12 +02:00
parent 8e668b5b34
commit e057a5e564
1 changed files with 7 additions and 0 deletions
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7
kernel/trace/ring_buffer.c
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@ -1495,6 +1495,13 @@ static int trace_recursive_lock(void)
if (unlikely(current->trace_recursion & (1 << level))) {
/* Disable all tracing before we do anything else */
tracing_off_permanent();
printk_once(KERN_WARNING "Tracing recursion: "
"HC[%lu]:SC[%lu]:NMI[%lu]\n",
hardirq_count() >> HARDIRQ_SHIFT,
softirq_count() >> SOFTIRQ_SHIFT,
in_nmi());
WARN_ON_ONCE(1);
return -1;
}