checkpatch: Add check for kcalloc argument order

kcalloc is sometimes misused with the first and second arguments switched.

Same issue with kmalloc_array too.

Bleat if sizeof is the first argument

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, 6 insertions, 0 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 2c50eb4c4e66..7b40a3f729a7 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3476,6 +3476,12 @@ sub process {
                              "unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr);
                 }
 
+# check for alloc argument mismatch
+                if ($line =~ /\b(kcalloc|kmalloc_array)\s*\(\s*sizeof\b/) {
+                        WARN("ALLOC_ARRAY_ARGS",
+                             "$1 uses number as first arg, sizeof is generally wrong\n" . $herecurr);
+                }
+
 # check for multiple semicolons
                 if ($line =~ /;\s*;\s*$/) {
                         WARN("ONE_SEMICOLON",