20 files changed, 613 insertions, 81 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index e5bd60ff48e3..913d6bdfdda3 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1600,13 +1600,17 @@ sub process {
 
 # Check signature styles
                 if (!$in_header_lines &&
-                    $line =~ /^(\s*)($signature_tags)(\s*)(.*)/) {
+                    $line =~ /^(\s*)([a-z0-9_-]+by:|$signature_tags)(\s*)(.*)/i) {
                         my $space_before = $1;
                         my $sign_off = $2;
                         my $space_after = $3;
                         my $email = $4;
                         my $ucfirst_sign_off = ucfirst(lc($sign_off));
 
+                        if ($sign_off !~ /$signature_tags/) {
+                                WARN("BAD_SIGN_OFF",
+                                     "Non-standard signature: $sign_off\n" . $herecurr);
+                        }
                         if (defined $space_before && $space_before ne "") {
                                 WARN("BAD_SIGN_OFF",
                                      "Do not use whitespace before $ucfirst_sign_off\n" . $herecurr);
@@ -1848,8 +1852,8 @@ sub process {
 
                         my $pos = pos_last_openparen($rest);
                         if ($pos >= 0) {
-                                $line =~ /^\+([ \t]*)/;
-                                my $newindent = $1;
+                                $line =~ /^(\+| )([ \t]*)/;
+                                my $newindent = $2;
 
                                 my $goodtabindent = $oldindent .
                                         "\t" x ($pos / 8) .
@@ -2984,6 +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:
 #       .
@@ -3261,6 +3304,12 @@ sub process {
                              "sizeof(& should be avoided\n" . $herecurr);
                 }
 
+# check for sizeof without parenthesis
+                if ($line =~ /\bsizeof\s+((?:\*\s*|)$Lval|$Type(?:\s+$Lval|))/) {
+                        WARN("SIZEOF_PARENTHESIS",
+                             "sizeof $1 should be sizeof($1)\n" . $herecurr);
+                }
+
 # check for line continuations in quoted strings with odd counts of "
                 if ($rawline =~ /\\$/ && $rawline =~ tr/"/"/ % 2) {
                         WARN("LINE_CONTINUATIONS",
@@ -3309,6 +3358,22 @@ sub process {
                         }
                 }
 
+# check usleep_range arguments
+                if ($^V && $^V ge 5.10.0 &&
+                    defined $stat &&
+                    $stat =~ /^\+(?:.*?)\busleep_range\s*\(\s*($FuncArg)\s*,\s*($FuncArg)\s*\)/) {
+                        my $min = $1;
+                        my $max = $7;
+                        if ($min eq $max) {
+                                WARN("USLEEP_RANGE",
+                                     "usleep_range should not use min == max args; see Documentation/timers/timers-howto.txt\n" . "$here\n$stat\n");
+                        } elsif ($min =~ /^\d+$/ && $max =~ /^\d+$/ &&
+                                 $min > $max) {
+                                WARN("USLEEP_RANGE",
+                                     "usleep_range args reversed, use min then max; see Documentation/timers/timers-howto.txt\n" . "$here\n$stat\n");
+                        }
+                }
+
 # check for new externs in .c files.
                 if ($realfile =~ /\.c$/ && defined $stat &&
                     $stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
diff --git a/scripts/coccinelle/iterators/use_after_iter.cocci b/scripts/coccinelle/iterators/use_after_iter.cocci
new file mode 100644
index 000000000000..06284c57a951
--- /dev/null
+++ b/scripts/coccinelle/iterators/use_after_iter.cocci
@@ -0,0 +1,147 @@
+/// If list_for_each_entry, etc complete a traversal of the list, the iterator
+/// variable ends up pointing to an address at an offset from the list head,
+/// and not a meaningful structure.  Thus this value should not be used after
+/// the end of the iterator.
+//#False positives arise when there is a goto in the iterator and the
+//#reported reference is at the label of this goto.  Some flag tests
+//#may also cause a report to be a false positive.
+///
+// Confidence: Moderate
+// Copyright: (C) 2012 Julia Lawall, INRIA/LIP6.  GPLv2.
+// Copyright: (C) 2012 Gilles Muller, INRIA/LIP6.  GPLv2.
+// URL: http://coccinelle.lip6.fr/
+// Comments:
+// Options: -no_includes -include_headers
+
+virtual context
+virtual org
+virtual report
+
+@r exists@
+identifier c,member;
+expression E,x;
+iterator name list_for_each_entry;
+iterator name list_for_each_entry_reverse;
+iterator name list_for_each_entry_continue;
+iterator name list_for_each_entry_continue_reverse;
+iterator name list_for_each_entry_from;
+iterator name list_for_each_entry_safe;
+iterator name list_for_each_entry_safe_continue;
+iterator name list_for_each_entry_safe_from;
+iterator name list_for_each_entry_safe_reverse;