The patch titled
checkpatch: suggest using min_t() or max_t()
has been removed from the -mm tree. Its filename was
checkpatch-suggest-using-min_t-or-max_t.patch
This patch was dropped because an updated version will be merged
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: checkpatch: suggest using min_t() or max_t()
From: Joe Perches <joe@xxxxxxxxxxx>
A common issue with min() or max() is using a cast on one or both of the
arguments when using min_t/max_t could be better.
Add cast detection to uses of min/max and suggest an appropriate use of
min_t or max_t instead.
Suggested-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Joe Perches <joe@xxxxxxxxxxx>
Cc: Andy Whitcroft <apw@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
scripts/checkpatch.pl | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff -puN scripts/checkpatch.pl~checkpatch-suggest-using-min_t-or-max_t scripts/checkpatch.pl
--- a/scripts/checkpatch.pl~checkpatch-suggest-using-min_t-or-max_t
+++ a/scripts/checkpatch.pl
@@ -268,6 +268,20 @@ sub build_types {
}
build_types();
+our $match_balanced_parentheses = qr/(\((?:[^\(\)]++|(?-1))*\))/;
+
+our $Typecast = qr{\s*(\(\s*$NonptrType\s*\)){0,1}\s*};
+our $LvalOrFunc = qr{($Lval)\s*($match_balanced_parentheses{0,1})\s*};
+
+sub deparenthesize {
+ my ($string) = @_;
+ return "" if (!defined($string));
+ $string =~ s@^\s*\(\s*@@g;
+ $string =~ s@\s*\)\s*$@@g;
+ $string =~ s@\s+@ @g;
+ return $string;
+}
+
$chk_signoff = 0 if ($file);
my @dep_includes = ();
@@ -2285,6 +2299,27 @@ sub process {
}
}
+# typecasts on min/max could be min_t/max_t
+ if ($line =~ /^\+.*\b(min|max)\s*\($Typecast{0,1}($LvalOrFunc)\s*,\s*$Typecast{0,1}($LvalOrFunc)\s*\)/) {
+ if (defined $2 || defined $7) {
+ my $call = $1;
+ my $cast1 = deparenthesize($2);
+ my $arg1 = $3;
+ my $cast2 = deparenthesize($7);
+ my $arg2 = $8;
+ my $cast;
+
+ if ($cast1 ne "" && $cast2 ne "") {
+ $cast = "$cast1 or $cast2";
+ } elsif ($cast1 ne "") {
+ $cast = $cast1;
+ } else {
+ $cast = $cast2;
+ }
+ WARN("$call() should probably be ${call}_t($cast, $arg1, $arg2)\n" . $herecurr);
+ }
+ }
+
# Need a space before open parenthesis after if, while etc
if ($line=~/\b(if|while|for|switch)\(/) {
ERROR("space required before the open parenthesis '('\n" . $herecurr);
_
Patches currently in -mm which might be from joe@xxxxxxxxxxx are
origin.patch
linux-next.patch
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