Messages in this thread | | | Date | Wed, 25 May 2016 19:59:47 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH] tracing: Choose static tp_printk buffer by explicit nesting count |
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On Wed, May 25, 2016 at 03:16:40PM +0200, Peter Zijlstra wrote: > On Tue, May 24, 2016 at 03:52:28PM -0700, Andy Lutomirski wrote: > > + struct trace_buffer_struct *buffer = this_cpu_ptr(trace_percpu_buffer); > > > > + if (!buffer || buffer->nesting >= 4) > > return NULL; > > This is buggy fwiw; you need to unconditionally increment > buffer->nesting to match the unconditional decrement. > > Otherwise 5 'increments' and 5 decrements will land you at -1.
Urgh, never mind me; if you don't dec when returning NULL this should work out fine.
My head really aint working right today.
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