perf ftrace: Fix failure to set cpumask when only one cpu is present
authorHe Zhe <zhe.he@windriver.com>
Fri, 2 Aug 2019 08:29:51 +0000 (16:29 +0800)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Thu, 8 Aug 2019 18:41:10 +0000 (15:41 -0300)
commitcf30ae726c011e0372fd4c2d588466c8b50a8907
treede3be5a37b33a98b6cd2808aaa551db025f5be48
parent3de7ae0b2a1d86dbb23d0cb135150534fdb2e836
perf ftrace: Fix failure to set cpumask when only one cpu is present

The buffer containing the string used to set cpumask is overwritten at
the end of the string later in cpu_map__snprint_mask due to not enough
memory space, when there is only one cpu.

And thus causes the following failure:

  $ perf ftrace ls
  failed to reset ftrace
  $

This patch fixes the calculation of the cpumask string size.

Signed-off-by: He Zhe <zhe.he@windriver.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Fixes: dc23103278c5 ("perf ftrace: Add support for -a and -C option")
Link: http://lkml.kernel.org/r/1564734592-15624-1-git-send-email-zhe.he@windriver.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
tools/perf/builtin-ftrace.c