linux-kernel - Re: [PATCH] perf arm: Fix off-by-one directory paths.

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Date:   Tue, 4 May 2021 13:52:00 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>, Leo Yan <leo.yan@...aro.org>,
        John Garry <john.garry@...wei.com>,
        Will Deacon <will@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf arm: Fix off-by-one directory paths.

On Tue, May 4, 2021 at 12:43 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> Hi Ian,
>
> On Tue, May 4, 2021 at 12:12 PM Ian Rogers <irogers@...gle.com> wrote:
> >
> > Relative path include works in the regular build due to -I paths but may
> > fail in other situations.
>
> Right, can we simply change them all to have a relative path from the
> $(srctree)/tools/perf ?  I think it'd be cleaner and easier to maintain.

It'd be a larger change but I agree it would be cleaner. I had a
related problem here:
https://lore.kernel.org/lkml/20210307223024.4081067-1-irogers@google.com/
Relying less on include path order, especially confusing in the ARM vs
ARM64 case where both arch directories are necessary, and on linker
tricks like weak I think would make the build cleaner and easier to
understand. Not calling C and header files the same name would also I
think reduce confusion. The cost would likely be more #ifs.

Given that is a larger refactor I think we can merge this while
working out a better plan.

Thanks,
Ian

> Thanks,
> Namhyung
>
> >
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
> > ---
> >  tools/perf/arch/arm/util/auxtrace.c         |  8 +++----
> >  tools/perf/arch/arm/util/cs-etm.c           | 24 ++++++++++-----------
> >  tools/perf/arch/arm/util/perf_regs.c        |  2 +-
> >  tools/perf/arch/arm/util/pmu.c              |  2 +-
> >  tools/perf/arch/arm/util/unwind-libdw.c     |  6 +++---
> >  tools/perf/arch/arm/util/unwind-libunwind.c |  4 ++--
> >  6 files changed, 23 insertions(+), 23 deletions(-)
> >
> > diff --git a/tools/perf/arch/arm/util/auxtrace.c b/tools/perf/arch/arm/util/auxtrace.c
> > index b187bddbd01a..7ed57222465e 100644
> > --- a/tools/perf/arch/arm/util/auxtrace.c
> > +++ b/tools/perf/arch/arm/util/auxtrace.c
> > @@ -8,10 +8,10 @@
> >  #include <linux/coresight-pmu.h>
> >  #include <linux/zalloc.h>
> >
> > -#include "../../util/auxtrace.h"
> > -#include "../../util/debug.h"
> > -#include "../../util/evlist.h"
> > -#include "../../util/pmu.h"
> > +#include "../../../util/auxtrace.h"
> > +#include "../../../util/debug.h"
> > +#include "../../../util/evlist.h"
> > +#include "../../../util/pmu.h"
> >  #include "cs-etm.h"
> >  #include "arm-spe.h"
> >
> > diff --git a/tools/perf/arch/arm/util/cs-etm.c b/tools/perf/arch/arm/util/cs-etm.c
> > index d942f118d32c..67c7fb8d7eb0 100644
> > --- a/tools/perf/arch/arm/util/cs-etm.c
> > +++ b/tools/perf/arch/arm/util/cs-etm.c
> > @@ -16,19 +16,19 @@
> >  #include <linux/zalloc.h>
> >
> >  #include "cs-etm.h"
> > -#include "../../util/debug.h"
> > -#include "../../util/record.h"
> > -#include "../../util/auxtrace.h"
> > -#include "../../util/cpumap.h"
> > -#include "../../util/event.h"
> > -#include "../../util/evlist.h"
> > -#include "../../util/evsel.h"
> > -#include "../../util/perf_api_probe.h"
> > -#include "../../util/evsel_config.h"
> > -#include "../../util/pmu.h"
> > -#include "../../util/cs-etm.h"
> > +#include "../../../util/debug.h"
> > +#include "../../../util/record.h"
> > +#include "../../../util/auxtrace.h"
> > +#include "../../../util/cpumap.h"
> > +#include "../../../util/event.h"
> > +#include "../../../util/evlist.h"
> > +#include "../../../util/evsel.h"
> > +#include "../../../util/perf_api_probe.h"
> > +#include "../../../util/evsel_config.h"
> > +#include "../../../util/pmu.h"
> > +#include "../../../util/cs-etm.h"
> >  #include <internal/lib.h> // page_size
> > -#include "../../util/session.h"
> > +#include "../../../util/session.h"
> >
> >  #include <errno.h>
> >  #include <stdlib.h>
> > diff --git a/tools/perf/arch/arm/util/perf_regs.c b/tools/perf/arch/arm/util/perf_regs.c
> > index 2864e2e3776d..2833e101a7c6 100644
> > --- a/tools/perf/arch/arm/util/perf_regs.c
> > +++ b/tools/perf/arch/arm/util/perf_regs.c
> > @@ -1,5 +1,5 @@
> >  // SPDX-License-Identifier: GPL-2.0
> > -#include "../../util/perf_regs.h"
> > +#include "../../../util/perf_regs.h"
> >
> >  const struct sample_reg sample_reg_masks[] = {
> >         SMPL_REG_END
> > diff --git a/tools/perf/arch/arm/util/pmu.c b/tools/perf/arch/arm/util/pmu.c
> > index bbc297a7e2e3..b8b23b9dc598 100644
> > --- a/tools/perf/arch/arm/util/pmu.c
> > +++ b/tools/perf/arch/arm/util/pmu.c
> > @@ -10,7 +10,7 @@
> >  #include <linux/string.h>
> >
> >  #include "arm-spe.h"
> > -#include "../../util/pmu.h"
> > +#include "../../../util/pmu.h"
> >
> >  struct perf_event_attr
> >  *perf_pmu__get_default_config(struct perf_pmu *pmu __maybe_unused)
> > diff --git a/tools/perf/arch/arm/util/unwind-libdw.c b/tools/perf/arch/arm/util/unwind-libdw.c
> > index 36ba4c69c3c5..b7692cb0c733 100644
> > --- a/tools/perf/arch/arm/util/unwind-libdw.c
> > +++ b/tools/perf/arch/arm/util/unwind-libdw.c
> > @@ -1,8 +1,8 @@
> >  // SPDX-License-Identifier: GPL-2.0
> >  #include <elfutils/libdwfl.h>
> > -#include "../../util/unwind-libdw.h"
> > -#include "../../util/perf_regs.h"
> > -#include "../../util/event.h"
> > +#include "../../../util/unwind-libdw.h"
> > +#include "../../../util/perf_regs.h"
> > +#include "../../../util/event.h"
> >
> >  bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg)
> >  {
> > diff --git a/tools/perf/arch/arm/util/unwind-libunwind.c b/tools/perf/arch/arm/util/unwind-libunwind.c
> > index 3a550225dfaf..438906bf0014 100644
> > --- a/tools/perf/arch/arm/util/unwind-libunwind.c
> > +++ b/tools/perf/arch/arm/util/unwind-libunwind.c
> > @@ -3,8 +3,8 @@
> >  #include <errno.h>
> >  #include <libunwind.h>
> >  #include "perf_regs.h"
> > -#include "../../util/unwind.h"
> > -#include "../../util/debug.h"
> > +#include "../../../util/unwind.h"
> > +#include "../../../util/debug.h"
> >
> >  int libunwind__arch_reg_id(int regnum)
> >  {
> > --
> > 2.31.1.607.g51e8a6a459-goog
> >