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authorJoe Perches <joe@perches.com>2012-07-30 14:41:24 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-07-30 17:25:17 -0700
commitb13edf7ff2dd0fef95e981170fa71fa6b60421b0 (patch)
treecdfbfb5429b089d1e41f9551bf112a8236fae078 /scripts
parent66c80b6077256898df948ac6acf547b47ddb1fcf (diff)
downloadlinux-linaro-stable-b13edf7ff2dd0fef95e981170fa71fa6b60421b0.tar.gz
checkpatch: add checks for do {} while (0) macro misuses
These types of macros should not be used for either a single statement nor should the macro end with a semi-colon. Add tests for these conditions. Signed-off-by: Joe Perches <joe@perches.com> Cc: Andy Whitcroft <apw@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts')
-rwxr-xr-xscripts/checkpatch.pl39
1 files changed, 39 insertions, 0 deletions
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 40b0627aeb5e..913d6bdfdda3 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2988,6 +2988,45 @@ sub process {
}
}
+# do {} while (0) macro tests:
+# single-statement macros do not need to be enclosed in do while (0) loop,
+# macro should not end with a semicolon
+ if ($^V && $^V ge 5.10.0 &&
+ $realfile !~ m@/vmlinux.lds.h$@ &&
+ $line =~ /^.\s*\#\s*define\s+$Ident(\()?/) {
+ my $ln = $linenr;
+ my $cnt = $realcnt;
+ my ($off, $dstat, $dcond, $rest);
+ my $ctx = '';
+ ($dstat, $dcond, $ln, $cnt, $off) =
+ ctx_statement_block($linenr, $realcnt, 0);
+ $ctx = $dstat;
+
+ $dstat =~ s/\\\n.//g;
+
+ if ($dstat =~ /^\+\s*#\s*define\s+$Ident\s*${balanced_parens}\s*do\s*{(.*)\s*}\s*while\s*\(\s*0\s*\)\s*([;\s]*)\s*$/) {
+ my $stmts = $2;
+ my $semis = $3;
+
+ $ctx =~ s/\n*$//;
+ my $cnt = statement_rawlines($ctx);
+ my $herectx = $here . "\n";
+
+ for (my $n = 0; $n < $cnt; $n++) {
+ $herectx .= raw_line($linenr, $n) . "\n";
+ }
+
+ if (($stmts =~ tr/;/;/) == 1) {
+ WARN("SINGLE_STATEMENT_DO_WHILE_MACRO",
+ "Single statement macros should not use a do {} while (0) loop\n" . "$herectx");
+ }
+ if (defined $semis && $semis ne "") {
+ WARN("DO_WHILE_MACRO_WITH_TRAILING_SEMICOLON",
+ "do {} while (0) macros should not be semicolon terminated\n" . "$herectx");
+ }
+ }
+ }
+
# make sure symbols are always wrapped with VMLINUX_SYMBOL() ...
# all assignments may have only one of the following with an assignment:
# .