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checkpatch: categorize some long line length checks 

Many lines of code extend beyond the maximum line length.  Some of these
are possibly justified by use type.

For instance:

structure definitions where comments are added per member like:
struct foo {
	type member;		/* some long description */

And lines that don't fit the typical logging message style
where a string constant is used like:

        SOME_MACRO(args, "Some long string");

Categorize these long line types so that checkpatch can use a command-line
--ignore=<type> option to avoid emitting some long line warnings.

One of the existing checkpatch exclusions allowed kernel-doc argument
documentation to exceed 80 columns because old versions of kernel-doc
required single line documentation.  The requirement was removed in 2009
so remove that exclusion.

Add documentation to make the test a bit clearer.

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Julia Lawall <julia.lawall@lip6.fr>
Cc: Michael Shuey <shuey@purdue.edu>
Cc: Dan Carpenter <dan.carpenter@oracle.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 2015-06-25 15:02:57 -07:00 committed by Linus Torvalds
parent 33acb54a43
commit 47e0c88b37
1 changed files with 50 additions and 10 deletions
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60
scripts/checkpatch.pl
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@ -2517,16 +2517,56 @@ sub process {
# check we are in a valid source file if not then ignore this hunk
next if ($realfile !~ /\.(h|c|s|S|pl|sh|dtsi|dts)$/);
#line length limit
if ($line =~ /^\+/ && $prevrawline !~ /\/\*\*/ &&
$rawline !~ /^.\s*\*\s*\@$Ident\s/ &&
!($line =~ /^\+\s*$logFunctions\s*\(\s*(?:(KERN_\S+\s*|[^"]*))?$String\s*(?:|,|\)\s*;)\s*$/ ||
$line =~ /^\+\s*$String\s*(?:\s*|,|\)\s*;)\s*$/ ||
$line =~ /^\+\s*#\s*define\s+\w+\s+$String$/) &&
$length > $max_line_length)
{
WARN("LONG_LINE",
"line over $max_line_length characters\n" . $herecurr);
# line length limit (with some exclusions)
#
# There are a few types of lines that may extend beyond $max_line_length:
# logging functions like pr_info that end in a string
# lines with a single string
# #defines that are a single string
#
# There are 3 different line length message types:
# LONG_LINE_COMMENT a comment starts before but extends beyond $max_linelength
# LONG_LINE_STRING a string starts before but extends beyond $max_line_length
# LONG_LINE all other lines longer than $max_line_length
#
# if LONG_LINE is ignored, the other 2 types are also ignored
#
if ($length > $max_line_length) {
my $msg_type = "LONG_LINE";
# Check the allowed long line types first
# logging functions that end in a string that starts
# before $max_line_length
if ($line =~ /^\+\s*$logFunctions\s*\(\s*(?:(?:KERN_\S+\s*|[^"]*))?($String\s*(?:|,|\)\s*;)\s*)$/ &&
length(expand_tabs(substr($line, 1, length($line) - length($1) - 1))) <= $max_line_length) {
$msg_type = "";
# lines with only strings (w/ possible termination)
# #defines with only strings
} elsif ($line =~ /^\+\s*$String\s*(?:\s*|,|\)\s*;)\s*$/ ||
$line =~ /^\+\s*#\s*define\s+\w+\s+$String$/) {
$msg_type = "";
# Otherwise set the alternate message types
# a comment starts before $max_line_length
} elsif ($line =~ /($;[\s$;]*)$/ &&
length(expand_tabs(substr($line, 1, length($line) - length($1) - 1))) <= $max_line_length) {
$msg_type = "LONG_LINE_COMMENT"
# a quoted string starts before $max_line_length
} elsif ($sline =~ /\s*($String(?:\s*(?:\\|,\s*|\)\s*;\s*))?)$/ &&
length(expand_tabs(substr($line, 1, length($line) - length($1) - 1))) <= $max_line_length) {
$msg_type = "LONG_LINE_STRING"
}
if ($msg_type ne "" &&
(show_type("LONG_LINE") || show_type($msg_type))) {
WARN($msg_type,
"line over $max_line_length characters\n" . $herecurr);
}
}
# check for adding lines without a newline.