The -q/--quiet option is to suppress any message.  Sometimes users just
want to run the command and it can be used for that case.

Suggested-by: Arnaldo Carvalho de Melo <[email protected]>
Signed-off-by: Namhyung Kim <[email protected]>
---
 tools/perf/Documentation/perf-inject.txt |  3 +++
 tools/perf/builtin-inject.c              | 10 ++++++++--
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/tools/perf/Documentation/perf-inject.txt 
b/tools/perf/Documentation/perf-inject.txt
index 87b2588d1cbd..c69fe37c38cc 100644
--- a/tools/perf/Documentation/perf-inject.txt
+++ b/tools/perf/Documentation/perf-inject.txt
@@ -29,6 +29,9 @@ OPTIONS
 -v::
 --verbose::
        Be more verbose.
+-q::
+--quiet::
+       Do not show any message.
 -i::
 --input=::
        Input file name. (default: stdin)
diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
index b9bc7e39833a..a2d94be1b27d 100644
--- a/tools/perf/builtin-inject.c
+++ b/tools/perf/builtin-inject.c
@@ -484,8 +484,10 @@ static int perf_inject__sched_switch(struct perf_tool 
*tool,
 
        ent = malloc(event->header.size + sizeof(struct event_entry));
        if (ent == NULL) {
-               color_fprintf(stderr, PERF_COLOR_RED,
+               if (!quiet) {
+                       color_fprintf(stderr, PERF_COLOR_RED,
                             "Not enough memory to process sched switch 
event!");
+               }
                return -1;
        }
 
@@ -780,6 +782,7 @@ int cmd_inject(int argc, const char **argv, const char 
*prefix __maybe_unused)
 #endif
                OPT_INCR('v', "verbose", &verbose,
                         "be more verbose (show build ids, etc)"),
+               OPT_BOOLEAN('q', "quiet", &quiet, "do not show any message"),
                OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name, "file",
                           "kallsyms pathname"),
                OPT_BOOLEAN('f', "force", &file.force, "don't complain, do it"),
@@ -805,13 +808,16 @@ int cmd_inject(int argc, const char **argv, const char 
*prefix __maybe_unused)
        if (argc)
                usage_with_options(inject_usage, options);
 
+       if (quiet)
+               perf_quiet_option();
+
        if (inject.strip && !inject.itrace_synth_opts.set) {
                pr_err("--strip option requires --itrace option\n");
                return -1;
        }
 
        if (perf_data_file__open(&inject.output)) {
-               perror("failed to create output file");
+               pr_err("failed to create output file: %s\n", strerror(errno));
                return -1;
        }
 
-- 
2.11.0

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