linux-kernel - Re: [PATCH] perf session: Fix undeclared 'oe'

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Date:   Mon, 30 Apr 2018 15:41:32 -0300
From:   Murilo Opsfelder Araujo <muriloo@...ux.ibm.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        David Carrillo-Cisneros <davidcc@...gle.com>,
        He Kuang <hekuang@...wei.com>, Ingo Molnar <mingo@...hat.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Paul Mackerras <paulus@...ba.org>,
        Paul Turner <pjt@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Sasha Levin <alexander.levin@...rosoft.com>,
        Simon Que <sque@...omium.org>,
        Stephane Eranian <eranian@...gle.com>,
        Wang Nan <wangnan0@...wei.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH] perf session: Fix undeclared 'oe'

On 04/30/2018 02:49 PM, Greg Kroah-Hartman wrote:
> On Mon, Apr 30, 2018 at 10:20:08AM -0700, Greg Kroah-Hartman wrote:
>> On Mon, Apr 30, 2018 at 02:11:55PM -0300, Murilo Opsfelder Araujo wrote:
>>> On 04/11/2018 05:21 PM, Murilo Opsfelder Araújo wrote:
>>>> On 04/11/2018 04:33 PM, Greg Kroah-Hartman wrote:
>>>>> On Wed, Apr 11, 2018 at 03:41:35PM -0300, Murilo Opsfelder Araujo wrote:
>>>>>> Using linux-3.18.y branch, perf build fails with the following:
>>>>>>
>>>>>>     $ make -s -j16 -C tools/perf V=1 WERROR=0 NO_LIBUNWIND=1 HAVE_CPLUS_DEMANGLE=1 NO_GTK2=1 NO_LIBNUMA=1 NO_STRLCPY=1 NO_BIONIC=1 prefix=/usr DESTDIR=/tmp/builddir/build all
>>>>>>     [...]
>>>>>>     util/session.c: In function ‘__perf_session__process_pipe_events’:
>>>>>>     util/session.c:1093:36: error: ‘oe’ undeclared (first use in this function)
>>>>>>       ordered_events__set_copy_on_queue(oe, true);
>>>>>>                                         ^
>>>>>>     util/session.c:1093:36: note: each undeclared identifier is reported only once for each function it appears in
>>>>>>
>>>>>> This patch fixes it for linux-3.18.y branch.
>>>>>
>>>>> Why is this failing now?  Has it always been broken?  Is there an
>>>>> upstream patch that fixed this instead?
>>>>>
>>>>
>>>> Hi, Greg.
>>>>
>>>> We've caught this build issue this week. I'm not sure since when it's
>>>> failing.
>>>>
>>>> The upstream patch that fixes this is:
>>>>
>>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fa713a4eb9cebe5dec71b1bd11429603e17d841d
>>>>
>>>> commit fa713a4eb9cebe5dec71b1bd11429603e17d841d
>>>> Author: Arnaldo Carvalho de Melo <acme@...hat.com>
>>>> Date:   Tue Mar 3 11:48:12 2015 -0300
>>>>
>>>>     perf ordered_events: Untangle from perf_session
>>>>
>>>> But it doesn't apply straightforwardly.  At
>>>> fa713a4eb9cebe5dec71b1bd11429603e17d841d, perf API and perf_evlist
>>>> struct are slightly different from linux-3.18.y.
>>>>
>>>> A list of upstream patches for a clean backport (I think) would be:
>>>>
>>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=54245fdc357613633954bfd38cffb71cb9def067
>>>>
>>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=75be989a7a18e9666efd92b846ee48bed79e8086
>>>>
>>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=313e53b08e99b1dacf9ea2b0fbe97890db1ea95f
>>>>
>>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9fa8727aa4d98d35ca50ef9cd8a50c6468af921d
>>>>
>>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fa713a4eb9cebe5dec71b1bd11429603e17d841d
>>>>
>>>> Do you prefer all above patches backported to linux-3.18.y or just the
>>>> one-line fix I sent?
>>>>
>>>>>> Fixes: 95b33b99cdd6 ("perf inject: Copy events when reordering events in pipe mode")
>>>>>
>>>>> Was this just a bad backport?
>>>>
>>>> Some patches were left behind, I guess.
>>>>
>>>>>
>>>>> thanks,
>>>>>
>>>>> greg k-h
>>>
>>> Hi, Greg.
>>>
>>> I've realized that perf build on v3.18.107 is still broken, actually, it
>>> got a bit worse than v3.18.104.
>>>
>>> After applying my patch to fix the undeclared 'oe', perf build fails
>>> with the following errors:
>>>
>>> $ make -s -j16 -C tools/perf V=1 WERROR=0 NO_LIBUNWIND=1
>>> HAVE_CPLUS_DEMANGLE=1 NO_GTK2=1 NO_LIBNUMA=1 NO_STRLCPY=1 NO_BIONIC=1
>>> prefix=/usr DESTDIR=/tmp/builddir/build all
>>> [...]
>>> tests/code-reading.c: In function ‘read_object_code’:
>>> tests/code-reading.c:145:19: error: ‘KMOD_DECOMP_LEN’ undeclared (first
>>> use in this function)
>>>   char decomp_name[KMOD_DECOMP_LEN];
>>>                    ^
>>> tests/code-reading.c:145:19: note: each undeclared identifier is
>>> reported only once for each function it appears in
>>> tests/code-reading.c:208:2: warning: implicit declaration of function
>>> ‘dso__needs_decompress’ [-Wimplicit-function-declaration]
>>>   if (dso__needs_decompress(al.map->dso)) {
>>>   ^
>>> tests/code-reading.c:208:2: warning: nested extern declaration of
>>> ‘dso__needs_decompress’ [-Wnested-externs]
>>> tests/code-reading.c:209:3: warning: implicit declaration of function
>>> ‘dso__decompress_kmodule_path’ [-Wimplicit-function-declaration]
>>>    if (dso__decompress_kmodule_path(al.map->dso, objdump_name,
>>>    ^
>>> tests/code-reading.c:209:3: warning: nested extern declaration of
>>> ‘dso__decompress_kmodule_path’ [-Wnested-externs]
>>> tests/code-reading.c:145:7: warning: unused variable ‘decomp_name’
>>> [-Wunused-variable]
>>>   char decomp_name[KMOD_DECOMP_LEN];
>>>        ^
>>>
>>> Apparently, this was introduced by commit
>>> 091b3b4ba55daf8b28f40794aefdaa0bdb5af7a1:
>>>
>>> commit 091b3b4ba55daf8b28f40794aefdaa0bdb5af7a1
>>> Author: Namhyung Kim <namhyung@...nel.org>
>>> Date:   Thu Jun 8 16:31:07 2017 +0900
>>>
>>>     perf tests: Decompress kernel module before objdump
>>>
>>>
>>> Namhyung, are you fixing this?
>>
>> Ugh, I can fix this, I just did so on 4.4.y...
> 
> Nope, this is a mess.  When did perf last build on 3.18.y?  It really
> looks like no one cares about it...

perf build is broken since v3.18.101.

v3.18.100 works just fine.

Cheers
Murilo