checkpatch: add some new alloc functions to various tests

Many new generic allocation functions like the kvmalloc family have been
added recently to the kernel.

The allocation functions test now includes:

o kvmalloc and variants
o kstrdup_const
o kmemdup_nul
o dma_alloc_coherent
o alloc_skb and variants

Add a separate $allocFunctions variable to help make the allocation
functions test a bit more readable.

Miscellanea:

o Use $allocFunctions in the unnecessary OOM message test and
  add exclude uses with __GFP_NOWARN
o Use $allocFunctions in the unnecessary cast test
o Add the kvmalloc family to the preferred sizeof alloc style
  foo = kvmalloc(sizeof(*foo), ...)

Link: http://lkml.kernel.org/r/a5e60a2b93e10baf84af063f6c8e56402273105d.camel@perches.com
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, 15 insertions, 4 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index c17cbc06911f..76748ab23ce9 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -466,6 +466,16 @@ our $logFunctions = qr{(?x:
         seq_vprintf|seq_printf|seq_puts
 )};
 
+our $allocFunctions = qr{(?x:
+        (?:(?:devm_)?
+                (?:kv|k|v)[czm]alloc(?:_node|_array)? |
+                kstrdup(?:_const)? |
+                kmemdup(?:_nul)?) |
+        (?:\w+)?alloc_skb(?:ip_align)? |
+                                # dev_alloc_skb/netdev_alloc_skb, et al
+        dma_alloc_coherent
+)};
+
 our $signature_tags = qr{(?xi:
         Signed-off-by:|
         Co-developed-by:|
@@ -5553,7 +5563,8 @@ sub process {
                         my ($s, $c) = ctx_statement_block($linenr - 3, $realcnt, 0);
 #                       print("line: <$line>\nprevline: <$prevline>\ns: <$s>\nc: <$c>\n\n\n");
 
-                        if ($s =~ /(?:^|\n)[ \+]\s*(?:$Type\s*)?\Q$testval\E\s*=\s*(?:\([^\)]*\)\s*)?\s*(?:devm_)?(?:[kv][czm]alloc(?:_node|_array)?\b|kstrdup|kmemdup|(?:dev_)?alloc_skb)/) {
+                        if ($s =~ /(?:^|\n)[ \+]\s*(?:$Type\s*)?\Q$testval\E\s*=\s*(?:\([^\)]*\)\s*)?\s*$allocFunctions\s*\(/ &&
+                            $s !~ /\b__GFP_NOWARN\b/ ) {
                                 WARN("OOM_MESSAGE",
                                      "Possible unnecessary 'out of memory' message\n" . $hereprev);
                         }
@@ -6204,8 +6215,8 @@ sub process {
                         }
                 }
 
-# check for pointless casting of kmalloc return
-                if ($line =~ /\*\s*\)\s*[kv][czm]alloc(_node){0,1}\b/) {
+# check for pointless casting of alloc functions
+                if ($line =~ /\*\s*\)\s*$allocFunctions\b/) {
                         WARN("UNNECESSARY_CASTS",
                              "unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr);
                 }
@@ -6213,7 +6224,7 @@ sub process {
 # alloc style
 # p = alloc(sizeof(struct foo), ...) should be p = alloc(sizeof(*p), ...)
                 if ($perl_version_ok &&
-                    $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*([kv][mz]alloc(?:_node)?)\s*\(\s*(sizeof\s*\(\s*struct\s+$Lval\s*\))/) {
+                    $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*((?:kv|k|v)[mz]alloc(?:_node)?)\s*\(\s*(sizeof\s*\(\s*struct\s+$Lval\s*\))/) {
                         CHK("ALLOC_SIZEOF_STRUCT",
                             "Prefer $3(sizeof(*$1)...) over $3($4...)\n" . $herecurr);
                 }