linux-kernel - Re: [PATCH] perf tools: return errcode in cs_etm__process_auxtrace

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Date:   Tue, 19 Mar 2019 11:46:31 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Yue Haibing <yuehaibing@...wei.com>,
        "Suzuki K. Poulose" <suzuki.poulose@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] perf tools: return errcode in
 cs_etm__process_auxtrace_info

Em Tue, Mar 19, 2019 at 08:38:32AM -0600, Mathieu Poirier escreveu:
> On Mon, 18 Mar 2019 at 11:15, Arnaldo Carvalho de Melo
> <arnaldo.melo@...il.com> wrote:
> >
> > Em Fri, Mar 15, 2019 at 10:26:49AM +0800, Yue Haibing escreveu:
> > > From: YueHaibing <yuehaibing@...wei.com>
> > >
> > > 'err' is set in err path, but it's not returned to callers.
> > > Also fix a pass zero to PTR_ERR issue.
> >
> > Next time please submit two patches, one for the PTR_ERR and another for
> > not throwing away the err = -E!INVAL and returning just -EINVAL, I'm
> > doing it this time.
> >
> 
> Please hold off on that - I've asked for other modifications to be
> done on this patch.

Do you really think that it is necessary to hold? The fixes are trivial
and I already have them split and applied, see them below, I think
whatever other changes can be done in further patches, no?

- Arnaldo

>From 6c5c248935a4da12a582b1518a38ec35044833ee Mon Sep 17 00:00:00 2001
From: YueHaibing <yuehaibing@...wei.com>
Date: Fri, 15 Mar 2019 10:26:49 +0800
Subject: [PATCH 24/42] perf cs-etm: return errcode in
 cs_etm__process_auxtrace_info()

'err' is set in err path, but it's not returned to callers. Don't always return
-EINVAL, return err.

Signed-off-by: YueHaibing <yuehaibing@...wei.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Suzuki K Poulouse <suzuki.poulose@....com>
Cc: linux-arm-kernel@...ts.infradead.org
Fixes: cd8bfd8c973e ("perf tools: Add processing of coresight metadata")
Link: http://lkml.kernel.org/r/20190315022649.17848-1-yuehaibing@huawei.com
[ split from a larger patch ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/cs-etm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
index 110804936fc3..2257ac4dbff2 100644
--- a/tools/perf/util/cs-etm.c
+++ b/tools/perf/util/cs-etm.c
@@ -2023,5 +2023,5 @@ int cs_etm__process_auxtrace_info(union perf_event *event,
 err_free_hdr:
 	zfree(&hdr);
 
-	return -EINVAL;
+	return err;
 }
-- 
2.20.1

>From 4ab1e71e45a91220bdca7fc3b79c600df81d9234 Mon Sep 17 00:00:00 2001
From: YueHaibing <yuehaibing@...wei.com>
Date: Fri, 15 Mar 2019 10:26:49 +0800
Subject: [PATCH 25/42] perf cs-etm: Remove errnoeous ERR_PTR() usage in in
 cs_etm__process_auxtrace_info

intlist__findnew() doesn't uses ERR_PTR() as a return mechanism so its callers
shouldn't try to extract the error using PTR_ERR(ret-from-intlist__findnew()),
make cs_etm__process_auxtrace_info9) return -ENOMEM instead.

Signed-off-by: YueHaibing <yuehaibing@...wei.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Suzuki K Poulouse <suzuki.poulose@....com>
Cc: linux-arm-kernel@...ts.infradead.org
Fixes: cd8bfd8c973e ("perf tools: Add processing of coresight metadata")
Link: http://lkml.kernel.org/r/20190315022649.17848-1-yuehaibing@huawei.com
[ split from a larger patch ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/cs-etm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
index 2257ac4dbff2..111f33cd1204 100644
--- a/tools/perf/util/cs-etm.c
+++ b/tools/perf/util/cs-etm.c
@@ -1908,7 +1908,7 @@ int cs_etm__process_auxtrace_info(union perf_event *event,
 
 		/* Something went wrong, no need to continue */
 		if (!inode) {
-			err = PTR_ERR(inode);
+			err = -ENOMEM;
 			goto err_free_metadata;
 		}
 
-- 
2.20.1