checkpatch: don't require kernel style __attribute__ shortcuts in uapi paths

Avoid prescribing kernel styled shortcuts for gcc extensions of
__attribute__((foo)) in the uapi include paths.

Fix $realfile filename when using -f/--file to not remove first level
directory as if the filename was used in a -P1 patch.  Only strip the
first level directory (typically a or b) for P1 patches.

Signed-off-by: Joe Perches <joe@perches.com>
Cc: "Dixit, Ashutosh" <ashutosh.dixit@intel.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>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 6e0f1ec..1eb5d2f 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1769,11 +1769,11 @@ sub process {
                # extract the filename as it passes
                if ($line =~ /^diff --git.*?(\S+)$/) {
                        $realfile = $1;
-                       $realfile =~ s@^([^/]*)/@@;
+                       $realfile =~ s@^([^/]*)/@@ if (!$file);
                        $in_commit_log = 0;
                } elsif ($line =~ /^\+\+\+\s+(\S+)/) {
                        $realfile = $1;
-                       $realfile =~ s@^([^/]*)/@@;
+                       $realfile =~ s@^([^/]*)/@@ if (!$file);
                        $in_commit_log = 0;
 
                        $p1_prefix = $1;
@@ -3877,7 +3877,8 @@ sub process {
                }
 
 # Check for __inline__ and __inline, prefer inline
-               if ($line =~ /\b(__inline__|__inline)\b/) {
+               if ($realfile !~ m@\binclude/uapi/@ &&
+                   $line =~ /\b(__inline__|__inline)\b/) {
                        if (WARN("INLINE",
                                 "plain inline is preferred over $1\n" . $herecurr) &&
                            $fix) {
@@ -3887,19 +3888,22 @@ sub process {
                }
 
 # Check for __attribute__ packed, prefer __packed
-               if ($line =~ /\b__attribute__\s*\(\s*\(.*\bpacked\b/) {
+               if ($realfile !~ m@\binclude/uapi/@ &&
+                   $line =~ /\b__attribute__\s*\(\s*\(.*\bpacked\b/) {
                        WARN("PREFER_PACKED",
                             "__packed is preferred over __attribute__((packed))\n" . $herecurr);
                }
 
 # Check for __attribute__ aligned, prefer __aligned
-               if ($line =~ /\b__attribute__\s*\(\s*\(.*aligned/) {
+               if ($realfile !~ m@\binclude/uapi/@ &&
+                   $line =~ /\b__attribute__\s*\(\s*\(.*aligned/) {
                        WARN("PREFER_ALIGNED",
                             "__aligned(size) is preferred over __attribute__((aligned(size)))\n" . $herecurr);
                }
 
 # Check for __attribute__ format(printf, prefer __printf
-               if ($line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf/) {
+               if ($realfile !~ m@\binclude/uapi/@ &&
+                   $line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf/) {
                        if (WARN("PREFER_PRINTF",
                                 "__printf(string-index, first-to-check) is preferred over __attribute__((format(printf, string-index, first-to-check)))\n" . $herecurr) &&
                            $fix) {
@@ -3909,7 +3913,8 @@ sub process {
                }
 
 # Check for __attribute__ format(scanf, prefer __scanf
-               if ($line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*scanf\b/) {
+               if ($realfile !~ m@\binclude/uapi/@ &&
+                   $line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*scanf\b/) {
                        if (WARN("PREFER_SCANF",
                                 "__scanf(string-index, first-to-check) is preferred over __attribute__((format(scanf, string-index, first-to-check)))\n" . $herecurr) &&
                            $fix) {