linux-kernel - Re: [PATCH] s390:ftrace: add save_stack_trace

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Date:	Fri, 29 Jan 2016 13:57:49 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Pratyush Anand <panand@...hat.com>, schwidefsky@...ibm.com,
	rostedt@...dmis.org, linux-s390@...r.kernel.org,
	Chunyu Hu <chuhu@...hat.com>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] s390:ftrace: add save_stack_trace_regs()

On Fri, Jan 29, 2016 at 09:54:47AM +0100, Heiko Carstens wrote:
> On Fri, Jan 29, 2016 at 10:50:28AM +0530, Pratyush Anand wrote:
> > Implement save_stack_trace_regs, so that stacktrace of a kprobe events can
> > be obtained.
> > 
> > Without this we see following warning:
> > "save_stack_trace_regs() not implemented yet."
> > when we execute:
> > echo stacktrace > /sys/kernel/debug/tracing/trace_options
> > echo "p kfree" >> /sys/kernel/debug/tracing/kprobe_events
> > echo 1 > /sys/kernel/debug/tracing/events/kprobes/enable
> > 
> > Reported-by: Chunyu Hu <chuhu@...hat.com>
> > Signed-off-by: Pratyush Anand <panand@...hat.com>
> > ---
> 
> Thanks. I just figured out that the ftrace stack tracer doesn't work at all
> anymore on s390.  I will apply your patch after I fixed that. ;)

Surpringly it wasn't one of my own patches which broke the stack tracer on
s390, but one from Steven:

72ac426a5bb0 ("tracing: Clean up stack tracing and fix fentry updates")

Now I only need to figure out why :)