linux-kernel - [PATCH] perf inject: Fix repipe usage

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Date:   Thu,  1 Apr 2021 13:36:05 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] perf inject: Fix repipe usage

Since commit 14d3d5405253 ("perf session: Try to read pipe data from file")
perf inject has started printing "PERFILE2h" when not processing pipes.

The commit exposed perf to the possiblity that the input is not a pipe but
the 'repipe' parameter gets used. That causes the printing because perf
inject sets 'repipe' to true always.

The 'repipe' parameter of perf_session__new() is used by 2 functions:
	- perf_file_header__read_pipe()
	- trace_report()
In both cases, the functions copy data to STDOUT_FILENO when 'repipe' is
true.

Fix by setting 'repipe' to true only if the output is a pipe.

Fixes: e558a5bd8b74 ("perf inject: Work with files")
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/builtin-inject.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
index 6fe44d97fde5..ddccc0eb7390 100644
--- a/tools/perf/builtin-inject.c
+++ b/tools/perf/builtin-inject.c
@@ -906,7 +906,7 @@ int cmd_inject(int argc, const char **argv)
 	}
 
 	data.path = inject.input_name;
-	inject.session = perf_session__new(&data, true, &inject.tool);
+	inject.session = perf_session__new(&data, inject.output.is_pipe, &inject.tool);
 	if (IS_ERR(inject.session))
 		return PTR_ERR(inject.session);
 
-- 
2.17.1