linux-kernel - Re: [PATCH v3 05/22] perf maps: Use a pointer for kmaps

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Message-ID: <Ygqxb4R5arsW2yiD@kernel.org>
Date:   Mon, 14 Feb 2022 16:45:51 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Darren Hart <dvhart@...radead.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        André Almeida <andrealmeid@...labora.com>,
        James Clark <james.clark@....com>,
        John Garry <john.garry@...wei.com>,
        Riccardo Mancini <rickyman7@...il.com>,
        Yury Norov <yury.norov@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Leo Yan <leo.yan@...aro.org>, Andi Kleen <ak@...ux.intel.com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Madhavan Srinivasan <maddy@...ux.ibm.com>,
        Shunsuke Nakamura <nakamura.shun@...itsu.com>,
        Song Liu <song@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Miaoqian Lin <linmq006@...il.com>,
        Stephen Brennan <stephen.s.brennan@...cle.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
        German Gomez <german.gomez@....com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Eric Dumazet <edumazet@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Hao Luo <haoluo@...gle.com>, eranian@...gle.com
Subject: Re: [PATCH v3 05/22] perf maps: Use a pointer for kmaps

Em Fri, Feb 11, 2022 at 02:23:03PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Fri, Feb 11, 2022 at 02:33:58AM -0800, Ian Rogers escreveu:
> > struct maps is reference counted, using a pointer is more idiomatic.
> 
> So, I tried to apply this after adding this to the cset comming log to
> make sure reviewers know that this is just a clarifying comming, no code
> change:
> 
> Committer notes:
> 
> Definition of machine__kernel_maps(machine), the replacement of &machine->kmaps
> 
> static inline
> struct maps *machine__kernel_maps(struct machine *machine)
> {
>         return machine->kmaps;
> }
> 
> but then when building on a f34 system I got:
> 
>   CC      /tmp/build/perf/bench/inject-buildid.o
> In file included from /var/home/acme/git/perf/tools/perf/util/build-id.h:10,
>                  from /var/home/acme/git/perf/tools/perf/util/dso.h:13,
>                  from tests/vmlinux-kallsyms.c:8:
> In function ‘machine__kernel_maps’,
>     inlined from ‘test__vmlinux_matches_kallsyms’ at tests/vmlinux-kallsyms.c:122:22:
> /var/home/acme/git/perf/tools/perf/util/machine.h:86:23: error: ‘vmlinux.kmaps’ is used uninitialized [-Werror=uninitialized]
>    86 |         return machine->kmaps;
>       |                ~~~~~~~^~~~~~~
> tests/vmlinux-kallsyms.c: In function ‘test__vmlinux_matches_kallsyms’:
> tests/vmlinux-kallsyms.c:121:34: note: ‘vmlinux’ declared here
>   121 |         struct machine kallsyms, vmlinux;
>       |                                  ^~~~~~~
> cc1: all warnings being treated as errors
> make[4]: *** [/var/home/acme/git/perf/tools/build/Makefile.build:96: /tmp/build/perf/tests/vmlinux-kallsyms.o] Error 1
> make[4]: *** Waiting for unfinished jobs....
>   CC      /tmp/build/perf/util/config.o
>   CC      /tmp/build/perf/arch/x86/util/archinsn.o
>   CC      /tmp/build/perf/arch/x86/util/intel-pt.o
>   CC      /tmp/build/perf/arch/x86/util/intel-bts.o
>   CC      /tmp/build/perf/util/db-export.o
>   CC      /tmp/build/perf/util/event.o
> make[3]: *** [/var/home/acme/git/perf/tools/build/Makefile.build:139: tests] Error 2
> make[3]: *** Waiting for unfinished jobs....
> 
> Can you please  take a look at that?

I'm applying this on top:

diff --git a/tools/perf/tests/vmlinux-kallsyms.c b/tools/perf/tests/vmlinux-kallsyms.c
index 84bf5f64006560f5..93dee542a177ed1d 100644
--- a/tools/perf/tests/vmlinux-kallsyms.c
+++ b/tools/perf/tests/vmlinux-kallsyms.c
@@ -119,7 +119,7 @@ static int test__vmlinux_matches_kallsyms(struct test_suite *test __maybe_unused
 	struct symbol *sym;
 	struct map *kallsyms_map, *vmlinux_map, *map;
 	struct machine kallsyms, vmlinux;
-	struct maps *maps = machine__kernel_maps(&vmlinux);
+	struct maps *maps;
 	u64 mem_start, mem_end;
 	bool header_printed;
 
@@ -132,6 +132,8 @@ static int test__vmlinux_matches_kallsyms(struct test_suite *test __maybe_unused
 	machine__init(&kallsyms, "", HOST_KERNEL_ID);
 	machine__init(&vmlinux, "", HOST_KERNEL_ID);
 
+	maps = machine__kernel_maps(&vmlinux);
+
 	/*
 	 * Step 2:
 	 *