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checkpatch: add 'Prefer ARRAY_SIZE" test 

Add a test for sizeof(foo)/sizeof(foo[0]) that could be ARRAY_SIZE(foo).

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 2015-04-16 12:44:36 -07:00 committed by Linus Torvalds
parent 6d07d01b62
commit b598b67060
1 changed files with 13 additions and 0 deletions
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13
scripts/checkpatch.pl
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@ -3227,6 +3227,19 @@ sub process {
$herecurr);
}
# check for sizeof(foo)/sizeof(foo[0]) that could be ARRAY_SIZE(foo)
if ($line =~ m@\bsizeof\s*\(\s*($Lval)\s*\)@) {
my $array = $1;
if ($line =~ m@\b(sizeof\s*\(\s*\Q$array\E\s*\)\s*/\s*sizeof\s*\(\s*\Q$array\E\s*\[\s*0\s*\]\s*\))@) {
my $array_div = $1;
if (WARN("ARRAY_SIZE",
"Prefer ARRAY_SIZE($array)\n" . $herecurr) &&
$fix) {
$fixed[$fixlinenr] =~ s/\Q$array_div\E/ARRAY_SIZE($array)/;
}
}
}
# check for function declarations without arguments like "int foo()"
if ($line =~ /(\b$Type\s+$Ident)\s*\(\s*\)/) {
if (ERROR("FUNCTION_WITHOUT_ARGS",