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Date: Tue, 23 Jun 2020 16:02:34 -0700 From: Joe Perches <joe@...ches.com> To: Andrew Morton <akpm@...ux-foundation.org> Cc: Andy Whitcroft <apw@...onical.com>, LKML <linux-kernel@...r.kernel.org>, Julia Lawall <julia.lawall@...6.fr> Subject: [PATCH] checkpatch: Add --fix option for ASSIGN_IN_IF Add a --fix option for 2 types of single-line assignment in if statements if ((foo = bar(...)) < BAZ) { expands to: foo = bar(..); if (foo < BAZ) { and if ((foo = bar(...)) { expands to: foo = bar(...); if (foo) { if statements with assignments spanning multiple lines are not converted with the --fix option. if statements with additional logic are also not converted. e.g.: if ((foo = bar(...)) & BAZ == BAZ) { Signed-off-by: Joe Perches <joe@...ches.com> --- Maybe coccinelle could do more complete conversions, but this seems to work OK for most uses. scripts/checkpatch.pl | 26 ++++++++++++++++++++++++-- 1 file changed, 24 insertions(+), 2 deletions(-) diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index b06093777fd8..396dc8721d4e 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -5052,8 +5052,30 @@ sub process { my ($s, $c) = ($stat, $cond); if ($c =~ /\bif\s*\(.*[^<>!=]=[^=].*/s) { - ERROR("ASSIGN_IN_IF", - "do not use assignment in if condition\n" . $herecurr); + if (ERROR("ASSIGN_IN_IF", + "do not use assignment in if condition\n" . $herecurr) && + $fix && $perl_version_ok) { + if ($rawline =~ /^\+(\s+)if\s*\(\s*(\!)?\s*\(\s*(($Lval)\s*=\s*$LvalOrFunc)\s*\)\s*(?:($Compare)\s*($FuncArg))?\s*\)\s*(\{)?\s*$/) { + my $space = $1; + my $not = $2; + my $statement = $3; + my $assigned = $4; + my $test = $8; + my $against = $9; + my $brace = $15; + fix_delete_line($fixlinenr, $rawline); + fix_insert_line($fixlinenr, "$space$statement;"); + my $newline = "${space}if ("; + $newline .= '!' if defined($not); + $newline .= '(' if (defined $not && defined($test) && defined($against)); + $newline .= "$assigned"; + $newline .= " $test $against" if (defined($test) && defined($against)); + $newline .= ')' if (defined $not && defined($test) && defined($against)); + $newline .= ')'; + $newline .= " {" if (defined($brace)); + fix_insert_line($fixlinenr + 1, $newline); + } + } } # Find out what is on the end of the line after the
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