checkpatch: add --strict warning for c99 fixed size typedefs : int<size>_t

Using declarations like u_int16_t in kernel code is not preferred.

Suggest the kernel sized types instead of the c99 types when not in the
uapi directory.

Add a $typeC99Typedefs variable for the types to check and neaten the
other typedef variables.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 25 insertions, 6 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 3f2ff26c631c..f7f222a1e908 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -347,15 +347,20 @@ our $UTF8	= qr{
         | $NON_ASCII_UTF8
 }x;
 
+our $typeC99Typedefs = qr{(?:__)?(?:[us]_?)?int_?(?:8|16|32|64)_t};
 our $typeOtherOSTypedefs = qr{(?x:
         u_(?:char|short|int|long) |          # bsd
         u(?:nchar|short|int|long)            # sysv
 )};
-
-our $typeTypedefs = qr{(?x:
+our $typeKernelTypedefs = qr{(?x:
         (?:__)?(?:u|s|be|le)(?:8|16|32|64)|
         atomic_t
 )};
+our $typeTypedefs = qr{(?x:
+        $typeC99Typedefs\b|
+        $typeOtherOSTypedefs\b|
+        $typeKernelTypedefs\b
+)};
 
 our $logFunctions = qr{(?x:
         printk(?:_ratelimited|_once|)|
@@ -516,7 +521,6 @@ sub build_types {
         my $allWithAttr = "(?x:  \n" . join("|\n  ", @typeListWithAttr) . "\n)";
         $Modifier       = qr{(?:$Attribute|$Sparse|$mods)};
         $BasicType      = qr{
-                                (?:$typeOtherOSTypedefs\b)|
                                 (?:$typeTypedefs\b)|
                                 (?:${all}\b)
                 }x;
@@ -524,7 +528,6 @@ sub build_types {
                         (?:$Modifier\s+|const\s+)*
                         (?:
                                 (?:typeof|__typeof__)\s*\([^\)]*\)|
-                                (?:$typeOtherOSTypedefs\b)|
                                 (?:$typeTypedefs\b)|
                                 (?:${all}\b)
                         )
@@ -542,7 +545,6 @@ sub build_types {
                         (?:
                                 (?:typeof|__typeof__)\s*\([^\)]*\)|
                                 (?:$typeTypedefs\b)|
-                                (?:$typeOtherOSTypedefs\b)|
                                 (?:${allWithAttr}\b)
                         )
                         (?:\s+$Modifier|\s+const)*
@@ -3264,7 +3266,6 @@ sub process {
                     $line !~ /\btypedef\s+$Type\s*\(\s*\*?$Ident\s*\)\s*\(/ &&
                     $line !~ /\btypedef\s+$Type\s+$Ident\s*\(/ &&
                     $line !~ /\b$typeTypedefs\b/ &&
-                    $line !~ /\b$typeOtherOSTypedefs\b/ &&
                     $line !~ /\b__bitwise(?:__|)\b/) {
                         WARN("NEW_TYPEDEFS",
                              "do not add new typedefs\n" . $herecurr);
@@ -4980,6 +4981,24 @@ sub process {
                               "Using weak declarations can have unintended link defects\n" . $herecurr);
                 }
 
+# check for c99 types like uint8_t used outside of uapi/
+                if ($realfile !~ m@\binclude/uapi/@ &&
+                    $line =~ /\b($Declare)\s*$Ident\s*[=;,\[]/) {
+                        my $type = $1;
+                        if ($type =~ /\b($typeC99Typedefs)\b/) {
+                                $type = $1;
+                                my $kernel_type = 'u';
+                                $kernel_type = 's' if ($type =~ /^_*[si]/);
+                                $type =~ /(\d+)/;
+                                $kernel_type .= $1;
+                                if (CHK("PREFER_KERNEL_TYPES",
+                                        "Prefer kernel type '$kernel_type' over '$type'\n" . $herecurr) &&
+                                    $fix) {
+                                        $fixed[$fixlinenr] =~ s/\b$type\b/$kernel_type/;
+                                }
+                        }
+                }
+
 # check for sizeof(&)
                 if ($line =~ /\bsizeof\s*\(\s*\&/) {
                         WARN("SIZEOF_ADDRESS",