checkpatch.pl: Update to v5.7

Keep the U-Boot changes to $logFunctions

Signed-off-by: Simon Glass <sjg@chromium.org>
[trini: Resync with v5.7 release which changed the default max line
 length, update commit to reflect]
Signed-off-by: Tom Rini <trini@konsulko.com>

1 files changed, 63 insertions, 165 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index c2641bc995e..bc51fffb77f 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -51,7 +51,7 @@ my %ignore_type = ();
 my @ignore = ();
 my $help = 0;
 my $configuration_file = ".checkpatch.conf";
-my $max_line_length = 80;
+my $max_line_length = 100;
 my $ignore_perl_version = 0;
 my $minimum_perl_version = 5.10.0;
 my $min_conf_desc_length = 4;
@@ -61,9 +61,7 @@ my $codespellfile = "/usr/share/codespell/dictionary.txt";
 my $conststructsfile = "$D/const_structs.checkpatch";
 my $typedefsfile = "";
 my $color = "auto";
-my $allow_c99_comments = 1; # Can be overridden by --ignore C99_COMMENT_TOLERANCE
-# git output parsing needs US English output, so first set backtick child process LANGUAGE
-my $git_command ='export LANGUAGE=en_US.UTF-8; git';
+my $allow_c99_comments = 1;
 
 sub help {
 	my ($exitcode) = @_;
@@ -96,7 +94,9 @@ Options:
   --types TYPE(,TYPE2...)    show only these comma separated message types
   --ignore TYPE(,TYPE2...)   ignore various comma separated message types
   --show-types               show the specific message type in the output
-  --max-line-length=n        set the maximum line length, if exceeded, warn
+  --max-line-length=n        set the maximum line length, (default $max_line_length)
+                             if exceeded, warn on patches
+                             requires --strict for use with --file
   --min-conf-desc-length=n   set the min description length, if shorter, warn
   --root=PATH                PATH to the kernel tree root
   --no-summary               suppress the per-file summary
@@ -470,19 +470,8 @@ our $logFunctions = qr{(?x:
 	seq_vprintf|seq_printf|seq_puts
 )};
 
-our $allocFunctions = qr{(?x:
-	(?:(?:devm_)?
-		(?:kv|k|v)[czm]alloc(?:_node|_array)? |
-		kstrdup(?:_const)? |
-		kmemdup(?:_nul)?) |
-	(?:\w+)?alloc_skb(?:ip_align)? |
-				# dev_alloc_skb/netdev_alloc_skb, et al
-	dma_alloc_coherent
-)};
-
 our $signature_tags = qr{(?xi:
 	Signed-off-by:|
-	Co-developed-by:|
 	Acked-by:|
 	Tested-by:|
 	Reviewed-by:|
@@ -588,27 +577,6 @@ foreach my $entry (@mode_permission_funcs) {
 }
 $mode_perms_search = "(?:${mode_perms_search})";
 
-our %deprecated_apis = (
-	"synchronize_rcu_bh"			=> "synchronize_rcu",
-	"synchronize_rcu_bh_expedited"		=> "synchronize_rcu_expedited",
-	"call_rcu_bh"				=> "call_rcu",
-	"rcu_barrier_bh"			=> "rcu_barrier",
-	"synchronize_sched"			=> "synchronize_rcu",
-	"synchronize_sched_expedited"		=> "synchronize_rcu_expedited",
-	"call_rcu_sched"			=> "call_rcu",
-	"rcu_barrier_sched"			=> "rcu_barrier",
-	"get_state_synchronize_sched"		=> "get_state_synchronize_rcu",
-	"cond_synchronize_sched"		=> "cond_synchronize_rcu",
-);
-
-#Create a search pattern for all these strings to speed up a loop below
-our $deprecated_apis_search = "";
-foreach my $entry (keys %deprecated_apis) {
-	$deprecated_apis_search .= '|' if ($deprecated_apis_search ne "");
-	$deprecated_apis_search .= $entry;
-}
-$deprecated_apis_search = "(?:${deprecated_apis_search})";
-
 our $mode_perms_world_writable = qr{
 	S_IWUGO		|
 	S_IWOTH		|
@@ -908,7 +876,7 @@ sub seed_camelcase_includes {
 	$camelcase_seeded = 1;
 
 	if (-e ".git") {
-		my $git_last_include_commit = `${git_command} log --no-merges --pretty=format:"%h%n" -1 -- include`;
+		my $git_last_include_commit = `git log --no-merges --pretty=format:"%h%n" -1 -- include`;
 		chomp $git_last_include_commit;
 		$camelcase_cache = ".checkpatch-camelcase.git.$git_last_include_commit";
 	} else {
@@ -936,7 +904,7 @@ sub seed_camelcase_includes {
 	}
 
 	if (-e ".git") {
-		$files = `${git_command} ls-files "include/*.h"`;
+		$files = `git ls-files "include/*.h"`;
 		@include_files = split('\n', $files);
 	}
 
@@ -960,13 +928,13 @@ sub git_commit_info {
 
 	return ($id, $desc) if ((which("git") eq "") || !(-e ".git"));
 
-	my $output = `${git_command} log --no-color --format='%H %s' -1 $commit 2>&1`;
+	my $output = `git log --no-color --format='%H %s' -1 $commit 2>&1`;
 	$output =~ s/^\s*//gm;
 	my @lines = split("\n", $output);
 
 	return ($id, $desc) if ($#lines < 0);
 
-	if ($lines[0] =~ /^error: short SHA1 $commit is ambiguous/) {
+	if ($lines[0] =~ /^error: short SHA1 $commit is ambiguous\./) {
 # Maybe one day convert this block of bash into something that returns
 # all matching commit ids, but it's very slow...
 #
@@ -1010,7 +978,7 @@ if ($git) {
 		} else {
 			$git_range = "-1 $commit_expr";
 		}
-		my $lines = `${git_command} log --no-color --no-merges --pretty=format:'%H %s' $git_range`;
+		my $lines = `git log --no-color --no-merges --pretty=format:'%H %s' $git_range`;
 		foreach my $line (split(/\n/, $lines)) {
 			$line =~ /^([0-9a-fA-F]{40,40}) (.*)$/;
 			next if (!defined($1) || !defined($2));
@@ -1025,7 +993,6 @@ if ($git) {
 }
 
 my $vname;
-$allow_c99_comments = !defined $ignore_type{"C99_COMMENT_TOLERANCE"};
 for my $filename (@ARGV) {
 	my $FILE;
 	if ($git) {
@@ -2691,24 +2658,6 @@ sub process {
 			} else {
 				$signatures{$sig_nospace} = 1;
 			}
-
-# Check Co-developed-by: immediately followed by Signed-off-by: with same name and email
-			if ($sign_off =~ /^co-developed-by:$/i) {
-				if ($email eq $author) {
-					WARN("BAD_SIGN_OFF",
-					      "Co-developed-by: should not be used to attribute nominal patch author '$author'\n" . "$here\n" . $rawline);
-				}
-				if (!defined $lines[$linenr]) {
-					WARN("BAD_SIGN_OFF",
-                                             "Co-developed-by: must be immediately followed by Signed-off-by:\n" . "$here\n" . $rawline);
-				} elsif ($rawlines[$linenr] !~ /^\s*signed-off-by:\s*(.*)/i) {
-					WARN("BAD_SIGN_OFF",
-					     "Co-developed-by: must be immediately followed by Signed-off-by:\n" . "$here\n" . $rawline . "\n" .$rawlines[$linenr]);
-				} elsif ($1 ne $email) {
-					WARN("BAD_SIGN_OFF",
-					     "Co-developed-by and Signed-off-by: name/email do not match \n" . "$here\n" . $rawline . "\n" .$rawlines[$linenr]);
-				}
-			}
 		}
 
 # Check email subject for common tools that don't need to be mentioned
@@ -2729,10 +2678,8 @@ sub process {
 		    ($line =~ /^\s*(?:WARNING:|BUG:)/ ||
 		     $line =~ /^\s*\[\s*\d+\.\d{6,6}\s*\]/ ||
 					# timestamp
-		     $line =~ /^\s*\[\<[0-9a-fA-F]{8,}\>\]/) ||
-		     $line =~ /^(?:\s+\w+:\s+[0-9a-fA-F]+){3,3}/ ||
-		     $line =~ /^\s*\#\d+\s*\[[0-9a-fA-F]+\]\s*\w+ at [0-9a-fA-F]+/) {
-					# stack dump address styles
+		     $line =~ /^\s*\[\<[0-9a-fA-F]{8,}\>\]/)) {
+					# stack dump address
 			$commit_log_possible_stack_dump = 1;
 		}
 
@@ -2904,17 +2851,6 @@ sub process {
 			}
 		}
 
-# check for invalid commit id
-		if ($in_commit_log && $line =~ /(^fixes:|\bcommit)\s+([0-9a-f]{6,40})\b/i) {
-			my $id;
-			my $description;
-			($id, $description) = git_commit_info($2, undef, undef);
-			if (!defined($id)) {
-				WARN("UNKNOWN_COMMIT_ID",
-				     "Unknown commit id '$2', maybe rebased or not pulled?\n" . $herecurr);
-			}
-		}
-
 # ignore non-hunk lines and lines being removed
 		next if (!$hunk_line || $line =~ /^-/);
 
@@ -3044,7 +2980,7 @@ sub process {
 			my @compats = $rawline =~ /\"([a-zA-Z0-9\-\,\.\+_]+)\"/g;
 
 			my $dt_path = $root . "/Documentation/devicetree/bindings/";
-			my $vp_file = $dt_path . "vendor-prefixes.yaml";
+			my $vp_file = $dt_path . "vendor-prefixes.txt";
 
 			foreach my $compat (@compats) {
 				my $compat2 = $compat;
@@ -3059,7 +2995,7 @@ sub process {
 
 				next if $compat !~ /^([a-zA-Z0-9\-]+)\,/;
 				my $vendor = $1;
-				`grep -Eq "\\"\\^\Q$vendor\E,\\.\\*\\":" $vp_file`;
+				`grep -Eq "^$vendor\\b" $vp_file`;
 				if ( $? >> 8 ) {
 					WARN("UNDOCUMENTED_DT_STRING",
 					     "DT compatible string vendor \"$vendor\" appears un-documented -- check $vp_file\n" . $herecurr);
@@ -3083,24 +3019,16 @@ sub process {
 					$comment = '..';
 				}
 
-# check SPDX comment style for .[chsS] files
-				if ($realfile =~ /\.[chsS]$/ &&
-				    $rawline =~ /SPDX-License-Identifier:/ &&
-				    $rawline !~ m@^\+\s*\Q$comment\E\s*@) {
-					WARN("SPDX_LICENSE_TAG",
-					     "Improper SPDX comment style for '$realfile', please use '$comment' instead\n" . $herecurr);
-				}
-
 				if ($comment !~ /^$/ &&
-				    $rawline !~ m@^\+\Q$comment\E SPDX-License-Identifier: @) {
-					WARN("SPDX_LICENSE_TAG",
-					     "Missing or malformed SPDX-License-Identifier tag in line $checklicenseline\n" . $herecurr);
+				    $rawline !~ /^\+\Q$comment\E SPDX-License-Identifier: /) {
+					 WARN("SPDX_LICENSE_TAG",
+					      "Missing or malformed SPDX-License-Identifier tag in line $checklicenseline\n" . $herecurr);
 				} elsif ($rawline =~ /(SPDX-License-Identifier: .*)/) {
-					my $spdx_license = $1;
-					if (!is_SPDX_License_valid($spdx_license)) {
-						WARN("SPDX_LICENSE_TAG",
-						     "'$spdx_license' is not supported in LICENSES/...\n" . $herecurr);
-					}
+					 my $spdx_license = $1;
+					 if (!is_SPDX_License_valid($spdx_license)) {
+						  WARN("SPDX_LICENSE_TAG",
+						       "'$spdx_license' is not supported in LICENSES/...\n" . $herecurr);
+					 }
 				}
 			}
 		}
@@ -3108,14 +3036,6 @@ sub process {
 # check we are in a valid source file if not then ignore this hunk
 		next if ($realfile !~ /\.(h|c|s|S|sh|dtsi|dts)$/);
 
-# check for using SPDX-License-Identifier on the wrong line number
-		if ($realline != $checklicenseline &&
-		    $rawline =~ /\bSPDX-License-Identifier:/ &&
-		    substr($line, @-, @+ - @-) eq "$;" x (@+ - @-)) {
-			WARN("SPDX_LICENSE_TAG",
-			     "Misplaced SPDX-License-Identifier tag - use line $checklicenseline instead\n" . $herecurr);
-		}
-
 # line length limit (with some exclusions)
 #
 # There are a few types of lines that may extend beyond $max_line_length:
@@ -3173,8 +3093,10 @@ sub process {
 
 			if ($msg_type ne "" &&
 			    (show_type("LONG_LINE") || show_type($msg_type))) {
-				WARN($msg_type,
-				     "line over $max_line_length characters\n" . $herecurr);
+				my $msg_level = \&WARN;
+				$msg_level = \&CHK if ($file);
+				&{$msg_level}($msg_type,
+					      "line length of $length exceeds $max_line_length columns\n" . $herecurr);
 			}
 		}
 
@@ -3953,23 +3875,14 @@ sub process {
 			WARN("STATIC_CONST_CHAR_ARRAY",
 			     "static const char * array should probably be static const char * const\n" .
 				$herecurr);
-		}
-
-# check for initialized const char arrays that should be static const
-		if ($line =~ /^\+\s*const\s+(char|unsigned\s+char|_*u8|(?:[us]_)?int8_t)\s+\w+\s*\[\s*(?:\w+\s*)?\]\s*=\s*"/) {
-			if (WARN("STATIC_CONST_CHAR_ARRAY",
-				 "const array should probably be static const\n" . $herecurr) &&
-			    $fix) {
-				$fixed[$fixlinenr] =~ s/(^.\s*)const\b/${1}static const/;
-			}
-		}
+               }
 
 # check for static char foo[] = "bar" declarations.
 		if ($line =~ /\bstatic\s+char\s+(\w+)\s*\[\s*\]\s*=\s*"/) {
 			WARN("STATIC_CONST_CHAR_ARRAY",
 			     "static char array declaration should probably be static const char\n" .
 				$herecurr);
-		}
+               }
 
 # check for const <foo> const where <foo> is not a pointer or array type
 		if ($sline =~ /\bconst\s+($BasicType)\s+const\b/) {
@@ -4677,7 +4590,7 @@ sub process {
 
 # closing brace should have a space following it when it has anything
 # on the line
-		if ($line =~ /}(?!(?:,|;|\)|\}))\S/) {
+		if ($line =~ /}(?!(?:,|;|\)))\S/) {
 			if (ERROR("SPACING",
 				  "space required after that close brace '}'\n" . $herecurr) &&
 			    $fix) {
@@ -5027,6 +4940,17 @@ sub process {
 		while ($line =~ m{($Constant|$Lval)}g) {
 			my $var = $1;
 
+#gcc binary extension
+			if ($var =~ /^$Binary$/) {
+				if (WARN("GCC_BINARY_CONSTANT",
+					 "Avoid gcc v4.3+ binary constant extension: <$var>\n" . $herecurr) &&
+				    $fix) {
+					my $hexval = sprintf("0x%x", oct($var));
+					$fixed[$fixlinenr] =~
+					    s/\b$var\b/$hexval/;
+				}
+			}
+
 #CamelCase
 			if ($var !~ /^$Constant$/ &&
 			    $var =~ /[A-Z][a-z]|[a-z][A-Z]/ &&
@@ -5208,7 +5132,7 @@ sub process {
 			        next if ($arg =~ /\.\.\./);
 			        next if ($arg =~ /^type$/i);
 				my $tmp_stmt = $define_stmt;
-				$tmp_stmt =~ s/\b(sizeof|typeof|__typeof__|__builtin\w+|typecheck\s*\(\s*$Type\s*,|\#+)\s*\(*\s*$arg\s*\)*\b//g;
+				$tmp_stmt =~ s/\b(typeof|__typeof__|__builtin\w+|typecheck\s*\(\s*$Type\s*,|\#+)\s*\(*\s*$arg\s*\)*\b//g;
 				$tmp_stmt =~ s/\#+\s*$arg\b//g;
 				$tmp_stmt =~ s/\b$arg\s*\#\#//g;
 				my $use_cnt = () = $tmp_stmt =~ /\b$arg\b/g;
@@ -5607,8 +5531,7 @@ sub process {
 			my ($s, $c) = ctx_statement_block($linenr - 3, $realcnt, 0);
 #			print("line: <$line>\nprevline: <$prevline>\ns: <$s>\nc: <$c>\n\n\n");
 
-			if ($s =~ /(?:^|\n)[ \+]\s*(?:$Type\s*)?\Q$testval\E\s*=\s*(?:\([^\)]*\)\s*)?\s*$allocFunctions\s*\(/ &&
-			    $s !~ /\b__GFP_NOWARN\b/ ) {
+			if ($s =~ /(?:^|\n)[ \+]\s*(?:$Type\s*)?\Q$testval\E\s*=\s*(?:\([^\)]*\)\s*)?\s*(?:devm_)?(?:[kv][czm]alloc(?:_node|_array)?\b|kstrdup|kmemdup|(?:dev_)?alloc_skb)/) {
 				WARN("OOM_MESSAGE",
 				     "Possible unnecessary 'out of memory' message\n" . $hereprev);
 			}
@@ -5729,7 +5652,7 @@ sub process {
 			# ignore udelay's < 10, however
 			if (! ($delay < 10) ) {
 				CHK("USLEEP_RANGE",
-				    "usleep_range is preferred over udelay; see Documentation/timers/timers-howto.rst\n" . $herecurr);
+				    "usleep_range is preferred over udelay; see Documentation/timers/timers-howto.txt\n" . $herecurr);
 			}
 			if ($delay > 2000) {
 				WARN("LONG_UDELAY",
@@ -5741,7 +5664,7 @@ sub process {
 		if ($line =~ /\bmsleep\s*\((\d+)\);/) {
 			if ($1 < 20) {
 				WARN("MSLEEP",
-				     "msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.rst\n" . $herecurr);
+				     "msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.txt\n" . $herecurr);
 			}
 		}
 
@@ -5890,18 +5813,6 @@ sub process {
 			     "__aligned(size) is preferred over __attribute__((aligned(size)))\n" . $herecurr);
 		}
 
-# Check for __attribute__ section, prefer __section
-		if ($realfile !~ m@\binclude/uapi/@ &&
-		    $line =~ /\b__attribute__\s*\(\s*\(.*_*section_*\s*\(\s*("[^"]*")/) {
-			my $old = substr($rawline, $-[1], $+[1] - $-[1]);
-			my $new = substr($old, 1, -1);
-			if (WARN("PREFER_SECTION",
-				 "__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($new)/;
-			}
-		}
-
 # Check for __attribute__ format(printf, prefer __printf
 		if ($realfile !~ m@\binclude/uapi/@ &&
 		    $line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf/) {
@@ -6024,7 +5935,7 @@ sub process {
 				while ($fmt =~ /(\%[\*\d\.]*p(\w))/g) {
 					$specifier = $1;
 					$extension = $2;
-					if ($extension !~ /[SsBKRraEhMmIiUDdgVCbGNOxt]/) {
+					if ($extension !~ /[SsBKRraEhMmIiUDdgVCbGNOx]/) {
 						$bad_specifier = $specifier;
 						last;
 					}
@@ -6144,11 +6055,11 @@ sub process {
 			my $max = $7;
 			if ($min eq $max) {
 				WARN("USLEEP_RANGE",
-				     "usleep_range should not use min == max args; see Documentation/timers/timers-howto.rst\n" . "$here\n$stat\n");
+				     "usleep_range should not use min == max args; see Documentation/timers/timers-howto.txt\n" . "$here\n$stat\n");
 			} elsif ($min =~ /^\d+$/ && $max =~ /^\d+$/ &&
 				 $min > $max) {
 				WARN("USLEEP_RANGE",
-				     "usleep_range args reversed, use min then max; see Documentation/timers/timers-howto.rst\n" . "$here\n$stat\n");
+				     "usleep_range args reversed, use min then max; see Documentation/timers/timers-howto.txt\n" . "$here\n$stat\n");
 			}
 		}
 
@@ -6271,8 +6182,8 @@ sub process {
 			}
 		}
 
-# check for pointless casting of alloc functions
-		if ($line =~ /\*\s*\)\s*$allocFunctions\b/) {
+# check for pointless casting of kmalloc return
+		if ($line =~ /\*\s*\)\s*[kv][czm]alloc(_node){0,1}\b/) {
 			WARN("UNNECESSARY_CASTS",
 			     "unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr);
 		}
@@ -6280,7 +6191,7 @@ sub process {
 # alloc style
 # p = alloc(sizeof(struct foo), ...) should be p = alloc(sizeof(*p), ...)
 		if ($perl_version_ok &&
-		    $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*((?:kv|k|v)[mz]alloc(?:_node)?)\s*\(\s*(sizeof\s*\(\s*struct\s+$Lval\s*\))/) {
+		    $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*([kv][mz]alloc(?:_node)?)\s*\(\s*(sizeof\s*\(\s*struct\s+$Lval\s*\))/) {
 			CHK("ALLOC_SIZEOF_STRUCT",
 			    "Prefer $3(sizeof(*$1)...) over $3($4...)\n" . $herecurr);
 		}
@@ -6443,6 +6354,19 @@ sub process {
 			}
 		}
 
+# check for bool bitfields
+		if ($sline =~ /^.\s+bool\s*$Ident\s*:\s*\d+\s*;/) {
+			WARN("BOOL_BITFIELD",
+			     "Avoid using bool as bitfield.  Prefer bool bitfields as unsigned int or u<8|16|32>\n" . $herecurr);
+		}
+
+# check for bool use in .h files
+		if ($realfile =~ /\.h$/ &&
+		    $sline =~ /^.\s+bool\s*$Ident\s*(?::\s*d+\s*)?;/) {
+			CHK("BOOL_MEMBER",
+			    "Avoid using bool structure members because of possible alignment issues - see: https://lkml.org/lkml/2017/11/21/384\n" . $herecurr);
+		}
+
 # check for semaphores initialized locked
 		if ($line =~ /^.\s*sema_init.+,\W?0\W?\)/) {
 			WARN("CONSIDER_COMPLETION",
@@ -6461,20 +6385,6 @@ sub process {
 			     "please use device_initcall() or more appropriate function instead of __initcall() (see include/linux/init.h)\n" . $herecurr);
 		}
 
-# check for spin_is_locked(), suggest lockdep instead
-		if ($line =~ /\bspin_is_locked\(/) {
-			WARN("USE_LOCKDEP",
-			     "Where possible, use lockdep_assert_held instead of assertions based on spin_is_locked\n" . $herecurr);
-		}
-
-# check for deprecated apis
-		if ($line =~ /\b($deprecated_apis_search)\b\s*\(/) {
-			my $deprecated_api = $1;
-			my $new_api = $deprecated_apis{$deprecated_api};
-			WARN("DEPRECATED_API",
-			     "Deprecated use of '$deprecated_api', prefer '$new_api' instead\n" . $herecurr);
-		}
-
 # check for various structs that are normally const (ops, kgdb, device_tree)
 # and avoid what seem like struct definitions 'struct foo {'
 		if ($line !~ /\bconst\b/ &&
@@ -6509,12 +6419,6 @@ sub process {
 			     "Using $1 should generally have parentheses around the comparison\n" . $herecurr);
 		}
 
-# nested likely/unlikely calls
-		if ($line =~ /\b(?:(?:un)?likely)\s*\(\s*!?\s*(IS_ERR(?:_OR_NULL|_VALUE)?|WARN)/) {
-			WARN("LIKELY_MISUSE",
-			     "nested (un)?likely() calls, $1 already uses unlikely() internally\n" . $herecurr);
-		}
-
 # whine mightly about in_atomic
 		if ($line =~ /\bin_atomic\s*\(/) {
 			if ($realfile =~ m@^drivers/@) {
@@ -6674,12 +6578,6 @@ sub process {
 				     "unknown module license " . $extracted_string . "\n" . $herecurr);
 			}
 		}
-
-# check for sysctl duplicate constants
-		if ($line =~ /\.extra[12]\s*=\s*&(zero|one|int_max)\b/) {
-			WARN("DUPLICATED_SYSCTL_CONST",
-				"duplicated sysctl range checking value '$1', consider using the shared one in include/linux/sysctl.h\n" . $herecurr);
-		}
 	}
 
 	# If we have no input at all, then there is nothing to report on