From: "Darrick J. Wong" <djwong@kernel.org>
To: bernd@bsbernd.com
Cc: fuse-devel@lists.linux.dev
Subject: [PATCH] checkpatch.pl: update to linux 7.0
Date: Tue, 12 May 2026 10:46:33 -0700 [thread overview]
Message-ID: <20260512174633.GA9544@frogsfrogsfrogs> (raw)
From: Darrick J. Wong <djwong@kernel.org>
Update this script to match the version from Linux 7.0, without
clobbering Bernd's _Atomic additions. This fixes the complaints
about "overly long" Fixes: commit ids.
Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
---
checkpatch.pl | 226 ++++++++++++++++++++++++++++++++++++++++++---------------
1 file changed, 168 insertions(+), 58 deletions(-)
diff --git a/checkpatch.pl b/checkpatch.pl
index 2d44e0e6edac30..ae480dfd9c906c 100755
--- a/checkpatch.pl
+++ b/checkpatch.pl
@@ -113,7 +113,8 @@ Options:
--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
+ --min-conf-desc-length=n set the minimum description length for config symbols
+ in lines, if shorter, warn (default $min_conf_desc_length)
--tab-size=n set the number of spaces for tab (default $tabsize)
--root=PATH PATH to the kernel tree root
--no-summary suppress the per-file summary
@@ -150,6 +151,24 @@ EOM
exit($exitcode);
}
+my $DO_WHILE_0_ADVICE = q{
+ do {} while (0) advice is over-stated in a few situations:
+
+ The more obvious case is macros, like MODULE_PARM_DESC, invoked at
+ file-scope, where C disallows code (it must be in functions). See
+ $exceptions if you have one to add by name.
+
+ More troublesome is declarative macros used at top of new scope,
+ like DECLARE_PER_CPU. These might just compile with a do-while-0
+ wrapper, but would be incorrect. Most of these are handled by
+ detecting struct,union,etc declaration primitives in $exceptions.
+
+ Theres also macros called inside an if (block), which "return" an
+ expression. These cannot do-while, and need a ({}) wrapper.
+
+ Enjoy this qualification while we work to improve our heuristics.
+};
+
sub uniq {
my %seen;
return grep { !$seen{$_}++ } @_;
@@ -667,6 +686,9 @@ our $tracing_logging_tags = qr{(?xi:
[\.\!:\s]*
)};
+# Device ID types like found in include/linux/mod_devicetable.h.
+our $dev_id_types = qr{\b[a-z]\w*_device_id\b};
+
sub edit_distance_min {
my (@arr) = @_;
my $len = scalar @arr;
@@ -835,20 +857,16 @@ 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",
"kmap" => "kmap_local_page",
"kunmap" => "kunmap_local",
"kmap_atomic" => "kmap_local_page",
"kunmap_atomic" => "kunmap_local",
+ #These should be enough to drive away new IDR users
+ "DEFINE_IDR" => "DEFINE_XARRAY",
+ "idr_init" => "xa_init",
+ "idr_init_base" => "xa_init_flags",
+ "rcu_read_lock_trace" => "rcu_read_lock_tasks_trace",
+ "rcu_read_unlock_trace" => "rcu_read_unlock_tasks_trace",
);
#Create a search pattern for all these strings to speed up a loop below
@@ -1085,7 +1103,9 @@ our $declaration_macros = qr{(?x:
(?:$Storage\s+)?(?:[A-Z_][A-Z0-9]*_){0,2}(?:DEFINE|DECLARE)(?:_[A-Z0-9]+){1,6}\s*\(|
(?:$Storage\s+)?[HLP]?LIST_HEAD\s*\(|
(?:SKCIPHER_REQUEST|SHASH_DESC|AHASH_REQUEST)_ON_STACK\s*\(|
- (?:$Storage\s+)?(?:XA_STATE|XA_STATE_ORDER)\s*\(
+ (?:$Storage\s+)?(?:XA_STATE|XA_STATE_ORDER)\s*\(|
+ __cacheline_group_(?:begin|end)(?:_aligned)?\s*\(|
+ __dma_from_device_group_(?:begin|end)\s*\(
)};
our %allow_repeated_words = (
@@ -2625,6 +2645,11 @@ sub exclude_global_initialisers {
$realfile =~ m@/bpf/.*\.bpf\.c$@;
}
+sub is_userspace {
+ my ($realfile) = @_;
+ return ($realfile =~ m@^tools/@ || $realfile =~ m@^scripts/@);
+}
+
sub process {
my $filename = shift;
@@ -2876,7 +2901,7 @@ sub process {
if ($realfile =~ m@^include/asm/@) {
ERROR("MODIFIED_INCLUDE_ASM",
- "do not modify files in include/asm, change architecture specific files in include/asm-<architecture>\n" . "$here$rawline\n");
+ "do not modify files in include/asm, change architecture specific files in arch/<architecture>/include/asm\n" . "$here$rawline\n");
}
$found_file = 1;
}
@@ -3011,6 +3036,16 @@ sub process {
}
}
+# Check for invalid patch separator
+ if ($in_commit_log &&
+ $line =~ /^---.+/) {
+ if (ERROR("BAD_COMMIT_SEPARATOR",
+ "Invalid commit separator - some tools may have problems applying this\n" . $herecurr) &&
+ $fix) {
+ $fixed[$fixlinenr] =~ s/-/=/g;
+ }
+ }
+
# Check for patch separator
if ($line =~ /^---$/) {
$has_patch_separator = 1;
@@ -3231,19 +3266,19 @@ sub process {
my $tag_case = not ($tag eq "Fixes:");
my $tag_space = not ($line =~ /^fixes:? [0-9a-f]{5,40} ($balanced_parens)/i);
- my $id_length = not ($orig_commit =~ /^[0-9a-f]{12}$/i);
+ my $id_length = not ($orig_commit =~ /^[0-9a-f]{12,40}$/i);
my $id_case = not ($orig_commit !~ /[A-F]/);
my $id = "0123456789ab";
my ($cid, $ctitle) = git_commit_info($orig_commit, $id,
$title);
- if ($ctitle ne $title || $tag_case || $tag_space ||
- $id_length || $id_case || !$title_has_quotes) {
+ if (defined($cid) && ($ctitle ne $title || $tag_case || $tag_space || $id_length || $id_case || !$title_has_quotes)) {
+ my $fixed = "Fixes: $cid (\"$ctitle\")";
if (WARN("BAD_FIXES_TAG",
- "Please use correct Fixes: style 'Fixes: <12 chars of sha1> (\"<title line>\")' - ie: 'Fixes: $cid (\"$ctitle\")'\n" . $herecurr) &&
+ "Please use correct Fixes: style 'Fixes: <12+ chars of sha1> (\"<title line>\")' - ie: '$fixed'\n" . $herecurr) &&
$fix) {
- $fixed[$fixlinenr] = "Fixes: $cid (\"$ctitle\")";
+ $fixed[$fixlinenr] = $fixed;
}
}
}
@@ -3283,7 +3318,7 @@ sub process {
# file delta changes
$line =~ /^\s*(?:[\w\.\-\+]*\/)++[\w\.\-\+]+:/ ||
# filename then :
- $line =~ /^\s*(?:Fixes:|$link_tags_search|$signature_tags)/i ||
+ $line =~ /^\s*(?:Fixes:|https?:|$link_tags_search|$signature_tags)/i ||
# A Fixes:, link or signature tag line
$commit_log_possible_stack_dump)) {
WARN("COMMIT_LOG_LONG_LINE",
@@ -3329,6 +3364,13 @@ sub process {
}
}
+# Check for auto-generated unhandled placeholder text (mostly for cover letters)
+ if (($in_commit_log || $in_header_lines) &&
+ $rawline =~ /(?:SUBJECT|BLURB) HERE/) {
+ ERROR("PLACEHOLDER_USE",
+ "Placeholder text detected\n" . $herecurr);
+ }
+
# Check for git id commit length and improperly formed commit descriptions
# A correctly formed commit description is:
# commit <SHA-1 hash length 12+ chars> ("Complete commit subject")
@@ -3492,9 +3534,10 @@ sub process {
# Check for various typo / spelling mistakes
if (defined($misspellings) &&
($in_commit_log || $line =~ /^(?:\+|Subject:)/i)) {
- while ($rawline =~ /(?:^|[^\w\-'`])($misspellings)(?:[^\w\-'`]|$)/gi) {
+ my $rawline_utf8 = decode("utf8", $rawline);
+ while ($rawline_utf8 =~ /(?:^|[^\w\-'`])($misspellings)(?:[^\w\-'`]|$)/gi) {
my $typo = $1;
- my $blank = copy_spacing($rawline);
+ my $blank = copy_spacing($rawline_utf8);
my $ptr = substr($blank, 0, $-[1]) . "^" x length($typo);
my $hereptr = "$hereline$ptr\n";
my $typo_fix = $spelling_fix{lc($typo)};
@@ -3656,7 +3699,7 @@ sub process {
$help_length < $min_conf_desc_length) {
my $stat_real = get_stat_real($linenr, $ln - 1);
WARN("CONFIG_DESCRIPTION",
- "please write a help paragraph that fully describes the config symbol\n" . "$here\n$stat_real\n");
+ "please write a help paragraph that fully describes the config symbol with at least $min_conf_desc_length lines\n" . "$here\n$stat_real\n");
}
}
@@ -3700,20 +3743,6 @@ sub process {
}
}
- if (($realfile =~ /Makefile.*/ || $realfile =~ /Kbuild.*/) &&
- ($line =~ /\+(EXTRA_[A-Z]+FLAGS).*/)) {
- my $flag = $1;
- my $replacement = {
- 'EXTRA_AFLAGS' => 'asflags-y',
- 'EXTRA_CFLAGS' => 'ccflags-y',
- 'EXTRA_CPPFLAGS' => 'cppflags-y',
- 'EXTRA_LDFLAGS' => 'ldflags-y',
- };
-
- WARN("DEPRECATED_VARIABLE",
- "Use of $flag is deprecated, please use \`$replacement->{$flag} instead.\n" . $herecurr) if ($replacement->{$flag});
- }
-
# check for DT compatible documentation
if (defined $root &&
(($realfile =~ /\.dtsi?$/ && $line =~ /^\+\s*compatible\s*=\s*\"/) ||
@@ -3745,6 +3774,18 @@ sub process {
}
}
+# Check for RGMII phy-mode with delay on PCB
+ if ($realfile =~ /\.(dts|dtsi|dtso)$/ &&
+ $line =~ /^\+\s*(phy-mode|phy-connection-type)\s*=\s*"/ &&
+ !ctx_has_comment($first_line, $linenr)) {
+ my $prop = $1;
+ my $mode = get_quoted_string($line, $rawline);
+ if ($mode =~ /^"rgmii(?:|-rxid|-txid)"$/) {
+ WARN("UNCOMMENTED_RGMII_MODE",
+ "$prop $mode without comment -- delays on the PCB should be described, otherwise use \"rgmii-id\"\n" . $herecurr);
+ }
+ }
+
# check for using SPDX license tag at beginning of files
if ($realline == $checklicenseline) {
if ($rawline =~ /^[ \+]\s*\#\!\s*\//) {
@@ -4828,7 +4869,7 @@ sub process {
}
# do not use BUG() or variants
- if ($line =~ /\b(?!AA_|BUILD_|DCCP_|IDA_|KVM_|RWLOCK_|snd_|SPIN_)(?:[a-zA-Z_]*_)?BUG(?:_ON)?(?:_[A-Z_]+)?\s*\(/) {
+ if ($line =~ /\b(?!AA_|BUILD_|IDA_|KVM_|RWLOCK_|snd_|SPIN_)(?:[a-zA-Z_]*_)?BUG(?:_ON)?(?:_[A-Z_]+)?\s*\(/) {
my $msg_level = \&WARN;
$msg_level = \&CHK if ($file);
&{$msg_level}("AVOID_BUG",
@@ -5514,9 +5555,9 @@ sub process {
}
}
-# check for unnecessary parentheses around comparisons in if uses
-# when !drivers/staging or command-line uses --strict
- if (($realfile !~ m@^(?:drivers/staging/)@ || $check_orig) &&
+# check for unnecessary parentheses around comparisons
+# except in drivers/staging
+ if (($realfile !~ m@^(?:drivers/staging/)@) &&
$perl_version_ok && defined($stat) &&
$stat =~ /(^.\s*if\s*($balanced_parens))/) {
my $if_stat = $1;
@@ -5844,6 +5885,8 @@ sub process {
#CamelCase
if ($var !~ /^$Constant$/ &&
$var =~ /[A-Z][a-z]|[a-z][A-Z]/ &&
+#Ignore C keywords
+ $var !~ /^_Generic$/ &&
#Ignore some autogenerated defines and enum values
$var !~ /^(?:[A-Z]+_){1,5}[A-Z]{1,3}[a-z]/ &&
#Ignore Page<foo> variants
@@ -5905,9 +5948,9 @@ sub process {
}
}
-# multi-statement macros should be enclosed in a do while loop, grab the
-# first statement and ensure its the whole macro if its not enclosed
-# in a known good container
+# Usually multi-statement macros should be enclosed in a do {} while
+# (0) loop. Grab the first statement and ensure its the whole macro
+# if its not enclosed in a known good container
if ($realfile !~ m@/vmlinux.lds.h$@ &&
$line =~ /^.\s*\#\s*define\s*$Ident(\()?/) {
my $ln = $linenr;
@@ -5960,10 +6003,13 @@ sub process {
my $exceptions = qr{
$Declare|
+ # named exceptions
module_param_named|
MODULE_PARM_DESC|
DECLARE_PER_CPU|
DEFINE_PER_CPU|
+ static_assert|
+ # declaration primitives
__typeof__\(|
union|
struct|
@@ -5998,11 +6044,11 @@ sub process {
ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE",
"Macros starting with if should be enclosed by a do - while loop to avoid possible if/else logic defects\n" . "$herectx");
} elsif ($dstat =~ /;/) {
- ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE",
- "Macros with multiple statements should be enclosed in a do - while loop\n" . "$herectx");
+ WARN("MULTISTATEMENT_MACRO_USE_DO_WHILE",
+ "Non-declarative macros with multiple statements should be enclosed in a do - while loop\n" . "$herectx\nBUT SEE:\n$DO_WHILE_0_ADVICE");
} else {
ERROR("COMPLEX_MACRO",
- "Macros with complex values should be enclosed in parentheses\n" . "$herectx");
+ "Macros with complex values should be enclosed in parentheses\n" . "$herectx\nBUT SEE:\n$DO_WHILE_0_ADVICE");
}
}
@@ -6046,7 +6092,7 @@ sub process {
}
# check if this is an unused argument
- if ($define_stmt !~ /\b$arg\b/) {
+ if ($define_stmt !~ /\b$arg\b/ && $define_stmt) {
WARN("MACRO_ARG_UNUSED",
"Argument '$arg' is not used in function-like macro\n" . "$herectx");
}
@@ -6702,6 +6748,13 @@ sub process {
}
}
+# check for context_unsafe without a comment.
+ if ($line =~ /\bcontext_unsafe\b/ &&
+ !ctx_has_comment($first_line, $linenr)) {
+ WARN("CONTEXT_UNSAFE",
+ "context_unsafe without comment\n" . $herecurr);
+ }
+
# check of hardware specific defines
if ($line =~ m@^.\s*\#\s*if.*\b(__i386__|__powerpc64__|__sun__|__s390x__)\b@ && $realfile !~ m@include/asm-@) {
CHK("ARCH_DEFINES",
@@ -6913,7 +6966,7 @@ sub process {
($extension eq "f" &&
defined $qualifier && $qualifier !~ /^w/) ||
($extension eq "4" &&
- defined $qualifier && $qualifier !~ /^cc/)) {
+ defined $qualifier && $qualifier !~ /^c(?:[hlbc]|hR)$/)) {
$bad_specifier = $specifier;
last;
}
@@ -7003,21 +7056,20 @@ sub process {
# }
# }
# }
-
# strcpy uses that should likely be strscpy
- if ($line =~ /\bstrcpy\s*\(/) {
+ if ($line =~ /\bstrcpy\s*\(/ && !is_userspace($realfile)) {
WARN("STRCPY",
"Prefer strscpy over strcpy - see: https://github.com/KSPP/linux/issues/88\n" . $herecurr);
}
# strlcpy uses that should likely be strscpy
- if ($line =~ /\bstrlcpy\s*\(/) {
+ if ($line =~ /\bstrlcpy\s*\(/ && !is_userspace($realfile)) {
WARN("STRLCPY",
"Prefer strscpy over strlcpy - see: https://github.com/KSPP/linux/issues/89\n" . $herecurr);
}
# strncpy uses that should likely be strscpy or strscpy_pad
- if ($line =~ /\bstrncpy\s*\(/) {
+ if ($line =~ /\bstrncpy\s*\(/ && !is_userspace($realfile)) {
WARN("STRNCPY",
"Prefer strscpy, strscpy_pad, or __nonstring over strncpy - see: https://github.com/KSPP/linux/issues/90\n" . $herecurr);
}
@@ -7228,17 +7280,42 @@ sub process {
"Prefer $3(sizeof(*$1)...) over $3($4...)\n" . $herecurr);
}
-# check for (kv|k)[mz]alloc with multiplies that could be kmalloc_array/kvmalloc_array/kvcalloc/kcalloc
+# check for (kv|k)[mz]alloc that could be kmalloc_obj/kvmalloc_obj/kzalloc_obj/kvzalloc_obj
+ if ($perl_version_ok &&
+ defined $stat &&
+ $stat =~ /^\+\s*($Lval)\s*\=\s*(?:$balanced_parens)?\s*((?:kv|k)[mz]alloc)\s*\(\s*($FuncArg)\s*,/) {
+ my $oldfunc = $3;
+ my $a1 = $4;
+ my $newfunc = "kmalloc_obj";
+ $newfunc = "kvmalloc_obj" if ($oldfunc eq "kvmalloc");
+ $newfunc = "kvzalloc_obj" if ($oldfunc eq "kvzalloc");
+ $newfunc = "kzalloc_obj" if ($oldfunc eq "kzalloc");
+
+ if ($a1 =~ s/^sizeof\s*\S\(?([^\)]*)\)?$/$1/) {
+ my $cnt = statement_rawlines($stat);
+ my $herectx = get_stat_here($linenr, $cnt, $here);
+
+ if (WARN("ALLOC_WITH_SIZEOF",
+ "Prefer $newfunc over $oldfunc with sizeof\n" . $herectx) &&
+ $cnt == 1 &&
+ $fix) {
+ $fixed[$fixlinenr] =~ s/\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*((?:kv|k)[mz]alloc)\s*\(\s*($FuncArg)\s*,/$1 = $newfunc($a1,/;
+ }
+ }
+ }
+
+
+# check for (kv|k)[mz]alloc with multiplies that could be kmalloc_objs/kvmalloc_objs/kzalloc_objs/kvzalloc_objs
if ($perl_version_ok &&
defined $stat &&
$stat =~ /^\+\s*($Lval)\s*\=\s*(?:$balanced_parens)?\s*((?:kv|k)[mz]alloc)\s*\(\s*($FuncArg)\s*\*\s*($FuncArg)\s*,/) {
my $oldfunc = $3;
my $a1 = $4;
my $a2 = $10;
- my $newfunc = "kmalloc_array";
- $newfunc = "kvmalloc_array" if ($oldfunc eq "kvmalloc");
- $newfunc = "kvcalloc" if ($oldfunc eq "kvzalloc");
- $newfunc = "kcalloc" if ($oldfunc eq "kzalloc");
+ my $newfunc = "kmalloc_objs";
+ $newfunc = "kvmalloc_objs" if ($oldfunc eq "kvmalloc");
+ $newfunc = "kvzalloc_objs" if ($oldfunc eq "kvzalloc");
+ $newfunc = "kzalloc_objs" if ($oldfunc eq "kzalloc");
my $r1 = $a1;
my $r2 = $a2;
if ($a1 =~ /^sizeof\s*\S/) {
@@ -7254,7 +7331,9 @@ sub process {
"Prefer $newfunc over $oldfunc with multiply\n" . $herectx) &&
$cnt == 1 &&
$fix) {
- $fixed[$fixlinenr] =~ s/\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*((?:kv|k)[mz]alloc)\s*\(\s*($FuncArg)\s*\*\s*($FuncArg)/$1 . ' = ' . "$newfunc(" . trim($r1) . ', ' . trim($r2)/e;
+ my $sized = trim($r2);
+ $sized =~ s/^sizeof\s*\S\(?([^\)]*)\)?$/$1/;
+ $fixed[$fixlinenr] =~ s/\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*((?:kv|k)[mz]alloc)\s*\(\s*($FuncArg)\s*\*\s*($FuncArg)/$1 . ' = ' . "$newfunc(" . $sized . ', ' . trim($r1)/e;
}
}
}
@@ -7677,6 +7756,37 @@ sub process {
WARN("DUPLICATED_SYSCTL_CONST",
"duplicated sysctl range checking value '$1', consider using the shared one in include/linux/sysctl.h\n" . $herecurr);
}
+
+# Check that *_device_id tables have sentinel entries.
+ if (defined $stat && $line =~ /struct\s+$dev_id_types\s+\w+\s*\[\s*\]\s*=\s*\{/) {
+ my $stripped = $stat;
+
+ # Strip diff line prefixes.
+ $stripped =~ s/(^|\n)./$1/g;
+ # Line continuations.
+ $stripped =~ s/\\\n/\n/g;
+ # Strip whitespace, empty strings, zeroes, and commas.
+ $stripped =~ s/""//g;
+ $stripped =~ s/0x0//g;
+ $stripped =~ s/[\s$;,0]//g;
+ # Strip field assignments.
+ $stripped =~ s/\.$Ident=//g;
+
+ if (!(substr($stripped, -4) eq "{}};" ||
+ substr($stripped, -6) eq "{{}}};" ||
+ $stripped =~ /ISAPNP_DEVICE_SINGLE_END}};$/ ||
+ $stripped =~ /ISAPNP_CARD_END}};$/ ||
+ $stripped =~ /NULL};$/ ||
+ $stripped =~ /PCMCIA_DEVICE_NULL};$/)) {
+ ERROR("MISSING_SENTINEL", "missing sentinel in ID array\n" . "$here\n$stat\n");
+ }
+ }
+
+# check for uninitialized pointers with __free attribute
+ while ($line =~ /\*\s*($Ident)\s+__free\s*\(\s*$Ident\s*\)\s*[,;]/g) {
+ ERROR("UNINITIALIZED_PTR_WITH_FREE",
+ "pointer '$1' with __free attribute should be initialized\n" . $herecurr);
+ }
}
# If we have no input at all, then there is nothing to report on
reply other threads:[~2026-05-12 17:46 UTC|newest]
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