linux-kernel - [for-linus][PATCH 2/2] ktest.pl: Fix the logic for truncating the size of the log file for email

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Date:   Fri, 18 Dec 2020 11:44:44 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     "John Warthog9 Hawley" <warthog9@...nel.org>,
        stable@...r.kernel.org
Subject: [for-linus][PATCH 2/2] ktest.pl: Fix the logic for truncating the size of the log file for
 email

From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>

The logic for truncating the log file for emailing based on the
MAIL_MAX_SIZE option is confusing and incorrect. Simplify it and have the
tail of the log file truncated to the max size specified in the config.

Cc: stable@...r.kernel.org
Fixes: 855d8abd2e8ff ("ktest.pl: Change the logic to control the size of the log file emailed")
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---
 tools/testing/ktest/ktest.pl | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/tools/testing/ktest/ktest.pl b/tools/testing/ktest/ktest.pl
index 54f7d008e840..4e2450964517 100755
--- a/tools/testing/ktest/ktest.pl
+++ b/tools/testing/ktest/ktest.pl
@@ -1499,17 +1499,16 @@ sub dodie {
 	my $log_file;
 
 	if (defined($opt{"LOG_FILE"})) {
-	    my $whence = 0; # beginning of file
-	    my $pos = $test_log_start;
+	    my $whence = 2; # End of file
+	    my $log_size = tell LOG;
+	    my $size = $log_size - $test_log_start;
 
 	    if (defined($mail_max_size)) {
-		my $log_size = tell LOG;
-		$log_size -= $test_log_start;
-		if ($log_size > $mail_max_size) {
-		    $whence = 2; # end of file
-		    $pos = - $mail_max_size;
+		if ($size > $mail_max_size) {
+		    $size = $mail_max_size;
 		}
 	    }
+	    my $pos = - $size;
 	    $log_file = "$tmpdir/log";
 	    open (L, "$opt{LOG_FILE}") or die "Can't open $opt{LOG_FILE} to read)";
 	    open (O, "> $tmpdir/log") or die "Can't open $tmpdir/log\n";
-- 
2.29.2