MFC r280793

pmcstat.8: fix -a flag description; improve -m flag to match

The -a flag reads a file saved by -O, not -o.

The -m flag requires the -R flag.  Copy that paragraph from -a.

Sponsored by:	Dell Inc.

2 files changed, 8 insertions, 2 deletions

diff --git a/usr.sbin/pmcstat/pmcstat.8 b/usr.sbin/pmcstat/pmcstat.8
index 677b21f..7de335d 100644
--- a/usr.sbin/pmcstat/pmcstat.8
+++ b/usr.sbin/pmcstat/pmcstat.8
@@ -236,7 +236,7 @@ This option requires the
 .Fl R
 option to read in samples that were previously collected and
 saved with the 
-.Fl o
+.Fl O
 option.
 .It Fl c Ar cpu-spec
 Set the cpus for subsequent system mode PMCs specified on the
@@ -302,6 +302,12 @@ is a
 this information is sent to the output file specified by the
 .Fl o
 option.
+This option requires the
+.Fl R
+option to read in samples that were previously collected and
+saved with the
+.Fl O
+option.
 .It Fl n Ar rate
 Set the default sampling rate for subsequent sampling mode
 PMCs specified on the command line.
diff --git a/usr.sbin/pmcstat/pmcstat.c b/usr.sbin/pmcstat/pmcstat.c
index 9ce4918..5ae53aa 100644
--- a/usr.sbin/pmcstat/pmcstat.c
+++ b/usr.sbin/pmcstat/pmcstat.c
@@ -938,7 +938,7 @@ main(int argc, char **argv)
 		errx(EX_USAGE, "ERROR: options -T and -l are mutually "
 		    "exclusive.");
 
-	/* -m option is allowed with -R only. */
+	/* -a and -m require -R */
 	if (args.pa_flags & FLAG_DO_ANNOTATE && args.pa_inputpath == NULL)
 		errx(EX_USAGE, "ERROR: option %s requires an input file",
 		    args.pa_plugin == PMCSTAT_PL_ANNOTATE ? "-m" : "-a");