checkpatch: prefer __printf over __attribute__((format(printf,...)))

Add a warn for not using __printf.

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>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 885e3b4..e94626c 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3114,6 +3114,12 @@ sub process {
                             "__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/) {
+                       WARN("PREFER_PRINTF",
+                            "__printf(string-index, first-to-check) is preferred over __attribute__((format(printf, string-index, first-to-check)))\n" . $herecurr);
+               }
+
 # check for sizeof(&)
                if ($line =~ /\bsizeof\s*\(\s*\&/) {
                        WARN("SIZEOF_ADDRESS",