checkpatch: pull out known acceptable typedefs

Within the type checker we have a number of common kernel types which must
be implemented as typedefs.  Pull those out so that we can use the same
expressions to trigger exclusions.

Signed-off-by: Andy Whitcroft <apw@shadowen.org>
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 bb88df2d001bfdbc289f8d5ec2ff5fce4c424108..4680ccf7760c4c96c1ec6358a40e21dd04f1b0a1 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -146,6 +146,11 @@ our $UTF8  = qr {
        |  \xF4[\x80-\x8F][\x80-\xBF]{2}     # plane 16
 }x;
 
+our $typeTypedefs = qr{(?x:
+       (?:__)?(?:u|s|be|le)(?:\d|\d\d)|
+       atomic_t
+)};
+
 our @typeList = (
        qr{void},
        qr{(?:unsigned\s+)?char},
@@ -159,7 +164,6 @@ our @typeList = (
        qr{float},
        qr{double},
        qr{bool},
-       qr{(?:__)?(?:u|s|be|le)(?:\d|\d\d)},
        qr{struct\s+$Ident},
        qr{union\s+$Ident},
        qr{enum\s+$Ident},
@@ -179,6 +183,7 @@ sub build_types {
                        (?:$Modifier\s+|const\s+)*
                        (?:
                                (?:typeof|__typeof__)\s*\(\s*\**\s*$Ident\s*\)|
+                               (?:$typeTypedefs\b)|
                                (?:${all}\b)
                        )
                        (?:\s+$Modifier|\s+const)*
@@ -1589,6 +1594,7 @@ sub process {
                if ($line =~ /\btypedef\s/ &&
                    $line !~ /\btypedef\s+$Type\s+\(\s*\*?$Ident\s*\)\s*\(/ &&
                    $line !~ /\btypedef\s+$Type\s+$Ident\s*\(/ &&
+                   $line !~ /\b$typeTypedefs\b/ &&
                    $line !~ /\b__bitwise(?:__|)\b/) {
                        WARN("do not add new typedefs\n" . $herecurr);
                }