checkpatch: returning errno typically should be negative
Add a (strict mode only) test to check for non-negative returns of what
appear to be errno values as the majority case these should indeed be
negative.
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 3cec299..bcdb54b 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2204,6 +2204,13 @@
ERROR("space required before the open parenthesis '('\n" . $herecurr);
}
}
+# Return of what appears to be an errno should normally be -'ve
+ if ($line =~ /^.\s*return\s*(E[A-Z]*)\s*;/) {
+ my $name = $1;
+ if ($name ne 'EOF' && $name ne 'ERROR') {
+ WARN("return of an errno should typically be -ve (return -$1)\n" . $herecurr);
+ }
+ }
# Need a space before open parenthesis after if, while etc
if ($line=~/\b(if|while|for|switch)\(/) {