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From: Adrian Hunter <adrian.hunter@intel.com>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>, linux-kernel@vger.kernel.org
Subject: [PATCH V2 1/6] perf script: Fix documented const'ness of perf_dlfilter_fns
Date: Wed, 11 Aug 2021 13:10:31 +0300	[thread overview]
Message-ID: <20210811101036.17986-2-adrian.hunter@intel.com> (raw)
In-Reply-To: <20210811101036.17986-1-adrian.hunter@intel.com>

perf_dlfilter_fns must not be const, because it is not. Declaring it
const can result in it being mapped read-only, causing a segfaullt when
it is written. Update documentation accordingly.

Fixes: 8defa7147d5572 ("perf script: Add API for filtering via dynamically loaded shared object")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/Documentation/perf-dlfilter.txt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/Documentation/perf-dlfilter.txt b/tools/perf/Documentation/perf-dlfilter.txt
index 02842cb4cf90..ece07509d1f7 100644
--- a/tools/perf/Documentation/perf-dlfilter.txt
+++ b/tools/perf/Documentation/perf-dlfilter.txt
@@ -32,7 +32,7 @@ The API for filtering consists of the following:
 ----
 #include <perf/perf_dlfilter.h>
 
-const struct perf_dlfilter_fns perf_dlfilter_fns;
+struct perf_dlfilter_fns perf_dlfilter_fns;
 
 int start(void **data, void *ctx);
 int stop(void *data, void *ctx);
@@ -214,7 +214,7 @@ Filter out everything except branches from "foo" to "bar":
 #include <perf/perf_dlfilter.h>
 #include <string.h>
 
-const struct perf_dlfilter_fns perf_dlfilter_fns;
+struct perf_dlfilter_fns perf_dlfilter_fns;
 
 int filter_event(void *data, const struct perf_dlfilter_sample *sample, void *ctx)
 {
-- 
2.17.1


  reply	other threads:[~2021-08-11 10:10 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-11 10:10 [PATCH V2 0/6] perf tools: Add dlfilter test Adrian Hunter
2021-08-11 10:10 ` Adrian Hunter [this message]
2021-08-11 10:10 ` [PATCH V2 2/6] perf script: Fix unnecessary machine_resolve() Adrian Hunter
2021-08-11 10:10 ` [PATCH V2 3/6] perf script: Fix --list-dlfilters documentation Adrian Hunter
2021-08-11 10:10 ` [PATCH V2 4/6] perf tools: Amend dlfilter documentation wrt library dependencies Adrian Hunter
2021-08-11 10:10 ` [PATCH V2 5/6] perf tools: Move perf_dlfilters.h in the source tree Adrian Hunter
2021-08-11 10:10 ` [PATCH V2 6/6] perf tools: Add dlfilter test Adrian Hunter
2021-08-11 12:38 ` [PATCH V2 0/6] " Arnaldo Carvalho de Melo

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