Messages in this thread Patch in this message | | | Date | Tue, 30 Oct 2012 05:11:46 -0700 | From | tip-bot for Jiri Olsa <> | Subject | [tip:perf/core] perf record: Fix mmap error output condition |
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Commit-ID: 0089fa9831f3752869143c7928adb94ac6353085 Gitweb: http://git.kernel.org/tip/0089fa9831f3752869143c7928adb94ac6353085 Author: Jiri Olsa <jolsa@redhat.com> AuthorDate: Sat, 20 Oct 2012 16:33:19 +0200 Committer: Arnaldo Carvalho de Melo <acme@redhat.com> CommitDate: Mon, 29 Oct 2012 12:14:59 -0200
perf record: Fix mmap error output condition
The mmap_pages default value is not power of 2 (UINT_MAX).
Together with perf_evlist__mmap function returning error value different from EPERM, we get misleading error message: "--mmap_pages/-m value must be a power of two."
Fixing this by adding extra check for UINT_MAX value for this error condition.
Signed-off-by: Jiri Olsa <jolsa@redhat.com> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1350743599-4805-12-git-send-email-jolsa@redhat.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> --- tools/perf/builtin-record.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 53c9892..5783c32 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -363,7 +363,8 @@ try_again: "or try again with a smaller value of -m/--mmap_pages.\n" "(current value: %d)\n", opts->mmap_pages); rc = -errno; - } else if (!is_power_of_2(opts->mmap_pages)) { + } else if (!is_power_of_2(opts->mmap_pages) && + (opts->mmap_pages != UINT_MAX)) { pr_err("--mmap_pages/-m value must be a power of two."); rc = -EINVAL; } else {
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