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checkpatch: improve MACRO_ARG_PRECEDENCE test

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It is possible for a multiple line macro definition to have a false positive
report when an argument is used on a line after a continuation \.

This line might have a leading '+' as the initial character that could be
confused by checkpatch as an operator.

Avoid the leading character on multiple line macro definitions.

Link: http://lkml.kernel.org/r/60229d13399f9b6509db5a32e30d4c16951a60cd.1473836073.git.joe@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 2016-10-11 13:52:14 -07:00 committed by Linus Torvalds
parent 9192d41a3f
commit 5207649b7b
1 changed files with 19 additions and 1 deletions
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20
scripts/checkpatch.pl
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@ -4833,13 +4833,31 @@ sub process {
}
}
# Make $define_stmt single line, comment-free, etc
my @stmt_array = split('\n', $define_stmt);
my $first = 1;
$define_stmt = "";
foreach my $l (@stmt_array) {
$l =~ s/\\$//;
if ($first) {
$define_stmt = $l;
$first = 0;
} elsif ($l =~ /^[\+ ]/) {
$define_stmt .= substr($l, 1);
}
}
$define_stmt =~ s/$;//g;
$define_stmt =~ s/\s+/ /g;
$define_stmt = trim($define_stmt);
# check if any macro arguments are reused (ignore '...' and 'type')
foreach my $arg (@def_args) {
next if ($arg =~ /\.\.\./);
next if ($arg =~ /^type$/i);
my $tmp = $define_stmt;
$tmp =~ s/\b(typeof|__typeof__|__builtin\w+|typecheck\s*\(\s*$Type\s*,|\#+)\s*\(*\s*$arg\s*\)*\b//g;
$tmp =~ s/\#\s*$arg\b//g;
$tmp =~ s/\#+\s*$arg\b//g;
$tmp =~ s/\b$arg\s*\#\#//g;
my $use_cnt = $tmp =~ s/\b$arg\b//g;
if ($use_cnt > 1) {