linux-kernel - [PATCH -next] checkpatch: Update __attribute_

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Date:   Tue, 27 Oct 2020 15:45:08 -0700
From:   Joe Perches <joe@...ches.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, Andy Whitcroft <apw@...onical.com>,
        Dwaipayan Ray <dwaipayanray1@...il.com>
Subject: [PATCH -next] checkpatch: Update __attribute__((section("name")))
 quote removal

commit 33def8498fdd ("treewide: Convert macro and uses of
__section(foo) to __section("foo")") removed the stringification of the
section name and now requires quotes around the named section.

Update checkpatch to not remove any quotes when suggesting conversion
of __attribute__((section("name"))) to __section("name")

Miscellanea:

o Add section to the hash with __section replacement
o Remove separate test for __attribute__((section
o Remove the limitation on converting attributes containing only
  known, possible conversions.  Any unknown attribute types are now
  left as-is and known types are converted and moved before
  __attribute__ and removed from within the __attribute__((list...)).

Signed-off-by: Joe Perches <joe@...ches.com>
---
 scripts/checkpatch.pl | 46 ++++++++++++++++------------------------------
 1 file changed, 16 insertions(+), 30 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 7800a090e8fe..a97f2ab11568 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -6216,51 +6216,37 @@ sub process {
 				"noreturn"			=> "__noreturn",
 				"packed"			=> "__packed",
 				"pure"				=> "__pure",
+				"section"			=> "__section",
 				"used"				=> "__used"
 			);
 
-			my @conv_array = ();
-			my $conv_possible = 1;
-
 			while ($attr =~ /\s*(\w+)\s*(${balanced_parens})?/g) {
-				my $curr_attr = $1;
+				my $orig_attr = $1;
 				my $params = '';
 				$params = $2 if defined($2);
+				my $curr_attr = $orig_attr;
 				$curr_attr =~ s/^[\s_]+|[\s_]+$//g;
-
 				if (exists($attr_list{$curr_attr})) {
+					my $new = $attr_list{$curr_attr};
 					if ($curr_attr eq "format" && $params) {
 						$params =~ /^\s*\(\s*(\w+)\s*,\s*(.*)/;
-						push(@conv_array, "__$1\($2");
+						$new = "__$1\($2";
 					} else {
-						my $new = $attr_list{$curr_attr};
-						push(@conv_array, "$new$params");
+						$new = "$new$params";
+					}
+					if (WARN("PREFER_DEFINED_ATTRIBUTE_MACRO",
+						 "Prefer $new over __attribute__(($orig_attr$params))\n" . $herecurr) &&
+					    $fix) {
+						my $remove = "\Q$orig_attr\E" . '\s*' . "\Q$params\E" . '(?:\s*,\s*)?';
+						$fixed[$fixlinenr] =~ s/$remove//;
+						$fixed[$fixlinenr] =~ s/\b__attribute__/$new __attribute__/;
+						$fixed[$fixlinenr] =~ s/\}\Q$new\E/} $new/;
 					}
-				} else {
-					$conv_possible = 0;
-					last;
-				}
-			}
-
-			if (scalar @conv_array > 0 && $conv_possible == 1) {
-				my $replace = join(' ', @conv_array);
-				if (WARN("PREFER_DEFINED_ATTRIBUTE_MACRO",
-				         "$replace is preferred over __attribute__(($attr))\n" . $herecurr) &&
-					$fix) {
-					$fixed[$fixlinenr] =~ s/\b__attribute__\s*\(\s*\(\s*\Q$attr\E\s*\)\s*\)/$replace/;
-					$fixed[$fixlinenr] =~ s/\}\Q$replace\E/} $replace/;
 				}
 			}
 
-			# Check for __attribute__ section, prefer __section
-			if ($attr =~ /^_*section_*\s*\(\s*("[^"]*")/) {
-				my $old = substr($attr, $-[1], $+[1] - $-[1]);
-				my $new = substr($old, 1, -1);
-				if (WARN("PREFER_DEFINED_ATTRIBUTE_MACRO",
-				         "__section($new) is preferred over __attribute__((section($old)))\n" . $herecurr) &&
-					$fix) {
-					$fixed[$fixlinenr] =~ s/\b__attribute__\s*\(\s*\(\s*_*section_*\s*\(\s*\Q$old\E\s*\)\s*\)\s*\)/__section($new)/;
-				}
+			if (show_type("PREFER_DEFINED_ATTRIBUTE_MACRO") && $fix) {
+				$fixed[$fixlinenr] =~ s/ __attribute__\s*\(\s*\(\s*\)\s*\)//;
 			}
 
 			# Check for __attribute__ unused, prefer __always_unused or __maybe_unused