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checkpatch: reduce runtime/cpu time used

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There are some cases where checkpatch can take a long time to complete.
Reduce the likelihood of this long run-time by adding a new test for lines
with and without comments and eliminating checks on lines with only
comments.

This reduces the number of "ctx_statement_block" calls, and also the
number of tests of $stat, which is now undefined for these blank lines.

One test in particular, the "check for switch/default statements without a
break", could take an extremely long time to parse as it tries to skip
interleaving comments within the ctx_statement_block/$stat and that could
be done multiple times unnecessarily.

A small test case taken from cfg80211.h before this patch would take
1000's of seconds to run, now it's just a couple seconds.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joe Perches 2013-09-11 14:24:03 -07:00 committed by Linus Torvalds
parent b34c648bb3
commit 1b5539b1ff
1 changed files with 3 additions and 1 deletions
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4
scripts/checkpatch.pl
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@ -1678,6 +1678,8 @@ sub process {
$linenr = 0;
foreach my $line (@lines) {
$linenr++;
my $sline = $line; #copy of $line
$sline =~ s/$;/ /g; #with comments as spaces
my $rawline = $rawlines[$linenr - 1];
@ -2194,7 +2196,7 @@ sub process {
$realline_next);
#print "LINE<$line>\n";
if ($linenr >= $suppress_statement &&
$realcnt && $line =~ /.\s*\S/) {
$realcnt && $sline =~ /.\s*\S/) {
($stat, $cond, $line_nr_next, $remain_next, $off_next) =
ctx_statement_block($linenr, $realcnt, 0);
$stat =~ s/\n./\n /g;