linux-kernel - Re: [PATCH 21/22] perf tools: Add trace-event global object for tracepoint interface

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Message-ID: <20131127152756.GF1208@krava.brq.redhat.com>
Date:	Wed, 27 Nov 2013 16:27:56 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	David Ahern <dsahern@...il.com>
Subject: Re: [PATCH 21/22] perf tools: Add trace-event global object for
 tracepoint interface

On Wed, Nov 27, 2013 at 04:10:45PM +0100, Jiri Olsa wrote:
> On Wed, Nov 27, 2013 at 10:46:00PM +0900, Namhyung Kim wrote:
> > Hi Jiri,
> > 
> > 2013-11-25 (월), 17:03 +0100, Jiri Olsa:
> > > On Sat, Nov 23, 2013 at 12:47:14AM +0900, Namhyung Kim wrote:
> > > > 2013-11-21 (목), 12:01 +0100, Jiri Olsa:
> > > > > In order to get the proper plugins processing we need to
> > > > > use full trace-event interface when creating tracepoint
> > > > > events. So far we were using shortcut to get the parsed
> > > > > format.
> > > > > 
> > > > > Moving current 'event_format__new' function into trace-event
> > > > > object as 'trace_event__tp_format'.
> > > > > 
> > > > > This function uses properly initialized global trace-event
> > > > > object, ensuring proper plugins processing.
> > > > 
> > > > I see this when I compile it on my old ubuntu 10.04 box (with gcc 4.4.3)
> > > > 
> > > >   CC       util/trace-event.o
> > > > cc1: warnings being treated as errors
> > > > util/trace-event.c: In function 'trace_event__tp_format':
> > > > util/trace-event.c:63: error: not protecting function: no buffer at
> > > > least 8 bytes long
> > > > make[1]: *** [util/trace-event.o] Error 1
> > > 
> > > hum, what was the stackprotector status?
> > > 
> > > ...                stackprotector: [ on  ]
> > > ...            stackprotector-all: [ on  ]
> > 
> > Right. Both of them were turned on.
> > 
> > Auto-detecting system features:
> > ...                     backtrace: [ on  ]
> > ...                         dwarf: [ on  ]
> > ...                fortify-source: [ on  ]
> > ...                         glibc: [ on  ]
> > ...                          gtk2: [ on  ]
> > ...                  gtk2-infobar: [ on  ]
> > ...                      libaudit: [ on  ]
> > ...                        libbfd: [ on  ]
> > ...                        libelf: [ on  ]
> > ...             libelf-getphdrnum: [ OFF ]
> > ...                   libelf-mmap: [ on  ]
> > ...                       libnuma: [ OFF ]
> > ...                       libperl: [ on  ]
> > ...                     libpython: [ on  ]
> > ...             libpython-version: [ on  ]
> > ...                      libslang: [ on  ]
> > ...                     libunwind: [ OFF ]
> > ...                       on-exit: [ on  ]
> > ...                stackprotector: [ on  ]
> > ...            stackprotector-all: [ on  ]
> > ...                       timerfd: [ on  ]
> 
> I found that -fstack-protector might not always work:
> https://bugs.launchpad.net/ubuntu/+source/gcc-4.5/+bug/691722
> 
> they say it was fixed in gcc 4.5.0 which I was not
> able to prove in gcc release notes..
> 
> we could disable the warning like in the below
> for gcc < 4.5.0, could you please test?
> 
> any other idea? ;-)

or remove -Wstack-protector option completely, as it's just informative
seems there's nothing you could do about the warning anyway

jirka
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