linux-kernel - Re: [PATCH/RFC 03/16] perf top: Factor out warnings about kernel addresses and symbols

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Date:	Thu, 10 Dec 2015 16:07:48 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Stephane Eranian <eranian@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH/RFC 03/16] perf top: Factor out warnings about kernel
 addresses and symbols

Em Thu, Dec 10, 2015 at 04:53:22PM +0900, Namhyung Kim escreveu:
> Factor out warning messages into separate functions.  These will be
> called in the display thread later.
> 
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/builtin-top.c | 95 ++++++++++++++++++++++++++----------------------
>  1 file changed, 51 insertions(+), 44 deletions(-)

Without applying patch 2, will check if it happens without this patch as well



[root@...andy ~]# echo 2 > /proc/sys/kernel/kptr_restrict
[root@...andy ~]# perf top
perf: Segmentation fault
-------- backtrace --------
perf[0x538b3b]
/lib64/libc.so.6(+0x35650)[0x7f401c036650]
perf[0x43af66]
perf(cmd_top+0xedf)[0x43cdbf]
perf[0x47b7c3]
perf(main+0x617)[0x4222b7]
/lib64/libc.so.6(__libc_start_main+0xf5)[0x7f401c022af5]
perf[0x4223c9]
[0x0]
[root@...andy ~]# 
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