From: Thomas-Mich Richter <tmricht@linux.ibm.com>
To: mpe@ellerman.id.au, linux-kernel@vger.kernel.org,
linux-perf-users@vger.kernel.org, acme@kernel.org
Cc: brueckner@linux.vnet.ibm.com, schwidefsky@de.ibm.com,
heiko.carstens@de.ibm.com
Subject: Re: [PATCH 2/3] perf report: Add raw report support for s390 auxiliary trace
Date: Wed, 8 Aug 2018 08:39:58 +0200 [thread overview]
Message-ID: <eda2632e-7919-5ffd-5f68-821e77d216fa@linux.ibm.com> (raw)
In-Reply-To: <87r2j9bkax.fsf@concordia.ellerman.id.au>
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On 08/08/2018 05:37 AM, mpe@ellerman.id.au wrote:
> Thomas Richter <tmricht@linux.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@linux.ibm.com>
>> Reviewed-by: Hendrik Brueckner <brueckner@linux.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
>
Can you please try this patch. Thanks a lot
--
Thomas Richter, Dept 3303, IBM s390 Linux Development, Boeblingen, Germany
--
Vorsitzende des Aufsichtsrats: Martina Koederitz
Geschäftsführung: Dirk Wittkopp
Sitz der Gesellschaft: Böblingen / Registergericht: Amtsgericht Stuttgart, HRB 243294
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[-- Attachment #2: 0001-perf-report-Fix-build-error-for-s390-auxiliary-trace.patch --]
[-- Type: text/x-patch; name="0001-perf-report-Fix-build-error-for-s390-auxiliary-trace.patch", Size: 2367 bytes --]
From add6a709f79e20e8b4eaa6ded2bd1af043f8a235 Mon Sep 17 00:00:00 2001
From: Thomas Richter <tmricht@linux.ibm.com>
Date: Wed, 8 Aug 2018 07:11:23 +0100
Subject: [PATCH] perf report: Fix build error for s390 auxiliary trace support
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Commit 73eeeea48b7e ("perf report: Add raw report support for s390 auxiliary trace")
introduced a compile errors on powerpc:
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]);
^
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);
^
Fix these errors:
1. Use memcpy to extract value from character array.
2. Use %zu as format string in pr_err
Fixes: 73eeeea48b7e
Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
---
tools/perf/util/s390-cpumsf.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/s390-cpumsf.c b/tools/perf/util/s390-cpumsf.c
index 15555604ddb3..2bcb160a08f0 100644
--- a/tools/perf/util/s390-cpumsf.c
+++ b/tools/perf/util/s390-cpumsf.c
@@ -184,7 +184,7 @@ static bool s390_cpumsf_basic_show(const char *color, size_t pos,
struct hws_basic_entry *basic)
{
if (basic->def != 1) {
- pr_err("Invalid AUX trace basic entry [%#08lx]\n", pos);
+ pr_err("Invalid AUX trace basic entry [%#08zx]\n", pos);
return false;
}
color_fprintf(stdout, color, " [%#08x] Basic Def:%04x Inst:%#04x"
@@ -219,7 +219,10 @@ static unsigned long long trailer_timestamp(struct hws_trailer_entry *te)
/* te->t set: TOD in STCKE format, bytes 8-15
* to->t not set: TOD in STCK format, bytes 0-7
*/
- return *((unsigned long long *) &te->timestamp[te->t]);
+ unsigned long long ts;
+
+ memcpy(&ts, &te->timestamp[te->t], sizeof(ts));
+ return ts;
}
/* Display s390 CPU measurement facility trailer entry */
--
2.14.3
next prev parent reply other threads:[~2018-08-08 6:40 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-02 7:46 [PATCH 0/3] perf report: Add s390 auxiliary trace support Thomas Richter
2018-08-02 7:46 ` [PATCH 1/3] perf auxtrace: Support for perf report -D for s390 Thomas Richter
2018-08-02 12:49 ` Arnaldo Carvalho de Melo
2018-08-03 10:07 ` Hendrik Brueckner
2018-08-03 13:32 ` Arnaldo Carvalho de Melo
2018-08-18 11:22 ` [tip:perf/urgent] " tip-bot for Thomas Richter
2018-08-02 7:46 ` [PATCH 2/3] perf report: Add raw report support for s390 auxiliary trace Thomas Richter
2018-08-08 3:37 ` mpe
2018-08-08 6:39 ` Thomas-Mich Richter [this message]
2018-08-08 15:53 ` Arnaldo Carvalho de Melo
2018-08-08 15:59 ` Arnaldo Carvalho de Melo
2018-08-08 16:08 ` Arnaldo Carvalho de Melo
2018-08-08 16:14 ` Arnaldo Carvalho de Melo
2018-08-08 16:42 ` Arnaldo Carvalho de Melo
2018-08-09 4:35 ` Thomas-Mich Richter
2018-08-09 15:14 ` Arnaldo Carvalho de Melo
2018-08-10 5:41 ` Michael Ellerman
2018-08-18 11:23 ` [tip:perf/urgent] " tip-bot for Thomas Richter
2018-08-02 7:46 ` [PATCH 3/3] perf report: Add GUI " Thomas Richter
2018-08-18 11:23 ` [tip:perf/urgent] " tip-bot for Thomas Richter
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