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authorJoe Perches <joe@perches.com>2013-09-11 14:23:58 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-09-11 15:58:43 -0700
commit70dc8a48357ce630d8a76887a9a36f0d34c8caf2 (patch)
treeaba8963ae8efcc2c6ecaa5cb495e53254fa9d7fc /scripts/checkpatch.pl
parent7e51f1979237e01bcd4e04e434c5da79151f08f8 (diff)
checkpatch: warn when using extern with function prototypes in .h files
Using the extern keyword on function prototypes is superfluous visual noise so suggest removing it. Using extern can cause unnecessary line wrapping at 80 columns and unnecessarily long multi-line function prototypes. Signed-off-by: Joe Perches <joe@perches.com> Suggested-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts/checkpatch.pl')
-rwxr-xr-xscripts/checkpatch.pl10
1 files changed, 10 insertions, 0 deletions
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 7c79c91662c..e2cb1f4621b 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3878,6 +3878,16 @@ sub process {
}
}
+# check for new externs in .h files.
+ if ($realfile =~ /\.h$/ &&
+ $line =~ /^\+\s*(extern\s+)$Type\s*$Ident\s*\(/s) {
+ if (WARN("AVOID_EXTERNS",
+ "extern prototypes should be avoided in .h files\n" . $herecurr) &&
+ $fix) {
+ $fixed[$linenr - 1] =~ s/(.*)\bextern\b\s*(.*)/$1$2/;
+ }
+ }
+
# check for new externs in .c files.
if ($realfile =~ /\.c$/ && defined $stat &&
$stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)