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checkpatch: add some new alloc functions to various tests

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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>
This commit is contained in:
Joe Perches 2019-03-07 16:28:35 -08:00 • committed by Linus Torvalds
parent fdf13693d3
commit e29a70f153
1 changed files with 15 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

19
scripts/checkpatch.pl
View file

@ -466,6 +466,16 @@ our $logFunctions = qr{(?x:
seq_vprintf|seq_printf|seq_puts 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: our $signature_tags = qr{(?xi:
Signed-off-by:| Signed-off-by:|
Co-developed-by:| Co-developed-by:|
@ -5553,7 +5563,8 @@ sub process {
my ($s, $c) = ctx_statement_block($linenr - 3, $realcnt, 0); my ($s, $c) = ctx_statement_block($linenr - 3, $realcnt, 0);
# print("line: <$line>\nprevline: <$prevline>\ns: <$s>\nc: <$c>\n\n\n"); # print("line: <$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*\(/ &&
$s !~ /\b__GFP_NOWARN\b/ ) {
WARN("OOM_MESSAGE", WARN("OOM_MESSAGE",
"Possible unnecessary 'out of memory' message\n" . $hereprev); "Possible unnecessary 'out of memory' message\n" . $hereprev);
} }
@ -6204,8 +6215,8 @@ sub process {
} }
} }
# check for pointless casting of kmalloc return # check for pointless casting of alloc functions
if ($line =~ /\*\s*\)\s*[kv][czm]alloc(_node){0,1}\b/) { if ($line =~ /\*\s*\)\s*$allocFunctions\b/) {
WARN("UNNECESSARY_CASTS", WARN("UNNECESSARY_CASTS",
"unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr); "unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr);
} }
@ -6213,7 +6224,7 @@ sub process {
# alloc style # alloc style
# p = alloc(sizeof(struct foo), ...) should be p = alloc(sizeof(*p), ...) # p = alloc(sizeof(struct foo), ...) should be p = alloc(sizeof(*p), ...)
if ($perl_version_ok && 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", CHK("ALLOC_SIZEOF_STRUCT",
"Prefer $3(sizeof(*$1)...) over $3($4...)\n" . $herecurr); "Prefer $3(sizeof(*$1)...) over $3($4...)\n" . $herecurr);
} }