linux-kernel - Re: [PATCH 2/3] perf report: Add raw report support for s390 auxiliary trace

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Date:   Wed, 08 Aug 2018 13:37:26 +1000
From:   mpe@...erman.id.au
To:     Thomas Richter <tmricht@...ux.ibm.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        acme@...nel.org
Cc:     brueckner@...ux.vnet.ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, Thomas Richter <tmricht@...ux.ibm.com>
Subject: Re: [PATCH 2/3] perf report: Add raw report support for s390 auxiliary trace

Thomas Richter <tmricht@...ux.ibm.com> writes:
> Add support for s390 auxiliary trace support.
> Use 'perf record -e rbd000' to create the perf.data file.
> The event also has the symbolic name SF_CYCLES_BASIC_DIAG,
> using 'perf record -e SF_CYCLES_BASIC_DIAG' is equivalent.
...
>
> Signed-off-by: Thomas Richter <tmricht@...ux.ibm.com>
> Reviewed-by: Hendrik Brueckner <brueckner@...ux.ibm.com>
> ---
>  tools/perf/util/s390-cpumsf-kernel.h |  71 ++++++++
>  tools/perf/util/s390-cpumsf.c        | 244 ++++++++++++++++++++++++++-
>  2 files changed, 314 insertions(+), 1 deletion(-)
>  create mode 100644 tools/perf/util/s390-cpumsf-kernel.h


I'm seeing a build break on ppc64le which seems to be caused by this
commit (I haven't bisected):

  util/s390-cpumsf.c: In function ‘trailer_timestamp’:
  util/s390-cpumsf.c:222:2: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
    return *((unsigned long long *) &te->timestamp[te->t]);
    ^


And on powerpc big endian:
  In file included from util/cpumap.h:10:0,
                   from util/s390-cpumsf.c:150:
  util/s390-cpumsf.c: In function ‘s390_cpumsf_basic_show’:
  util/s390-cpumsf.c:187:10: error: format ‘%lx’ expects argument of type ‘long unsigned int’, but argument 4 has type ‘size_t {aka unsigned int}’ [-Werror=format=]
     pr_err("Invalid AUX trace basic entry [%#08lx]\n", pos);
            ^

cheers