From: Jiri Olsa Date: Sat, 20 Oct 2012 14:33:19 +0000 (+0200) Subject: perf record: Fix mmap error output condition X-Git-Tag: firefly_0821_release~3680^2~1401^2~27^2~1 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0089fa9831f3752869143c7928adb94ac6353085;p=firefly-linux-kernel-4.4.55.git 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 Cc: Corey Ashford Cc: Frederic Weisbecker Cc: Ingo Molnar Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1350743599-4805-12-git-send-email-jolsa@redhat.com Signed-off-by: Arnaldo Carvalho de Melo --- diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 53c9892e96dd..5783c3225116 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 {