From: Dwaipayan Ray <dwaipayanray1@gmail.com>
To: joe@perches.com
Cc: linux-kernel-mentees@lists.linuxfoundation.org,
dwaipayanray1@gmail.com, linux-kernel@vger.kernel.org,
lukas.bulwahn@gmail.com
Subject: [PATCH v3] checkpatch: extend attributes check to handle more patterns
Date: Sat, 24 Oct 2020 14:35:57 +0530 [thread overview]
Message-ID: <20201024090557.45092-1-dwaipayanray1@gmail.com> (raw)
It is generally preferred that the macros from
include/linux/compiler_attributes.h are used, unless there
is a reason not to.
checkpatch currently checks __attribute__ for each of
packed, aligned, printf, scanf, and weak. Other declarations
in compiler_attributes.h are not handled.
Add a generic test to check the presence of such attributes.
Some attributes require more specific handling and are kept
separate.
New attributes which are now handled are:
__alias__(#symbol)
__always_inline__
__assume_aligned__(a, ## __VA_ARGS__)
__cold__
__const__
__copy__(symbol)
__designated_init__
__externally_visible__
__gnu_inline__
__malloc__
__mode__(x)
__no_caller_saved_registers__
__noclone__
__fallthrough__
__noinline__
__nonstring__
__noreturn__
__pure__
__unused__
__used__
Link: https://lore.kernel.org/linux-kernel-mentees/3ec15b41754b01666d94b76ce51b9832c2dd577a.camel@perches.com/
Suggested-by: Joe Perches <joe@perches.com>
Signed-off-by: Dwaipayan Ray <dwaipayanray1@gmail.com>
---
scripts/checkpatch.pl | 105 +++++++++++++++++++++++++++---------------
1 file changed, 69 insertions(+), 36 deletions(-)
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 7e505688257a..01d83d345b4c 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -6155,50 +6155,83 @@ sub process {
}
}
-# Check for __attribute__ packed, prefer __packed
+# Check for compiler attributes
if ($realfile !~ m@\binclude/uapi/@ &&
- $line =~ /\b__attribute__\s*\(\s*\(.*\bpacked\b/) {
- WARN("PREFER_PACKED",
- "__packed is preferred over __attribute__((packed))\n" . $herecurr);
- }
+ $line =~ /__attribute__\s*\(\s*($balanced_parens)\s*\)/) {
+ my $attr = $1;
+ $attr =~ s/\s*\(\s*(.*)\)\s*/$1/;
+
+ my %attr_list = (
+ "alias" => "__alias",
+ "aligned" => "__aligned",
+ "always_inline" => "__always_inline",
+ "assume_aligned" => "__assume_aligned",
+ "cold" => "__cold",
+ "const" => "__const",
+ "copy" => "__copy",
+ "designated_init" => "__designated_init",
+ "externally_visible" => "__visible",
+ "fallthrough" => "fallthrough",
+ "gnu_inline" => "__gnu_inline",
+ "malloc" => "__malloc",
+ "mode" => "__mode",
+ "no_caller_saved_registers" => "__no_caller_saved_registers",
+ "noclone" => "__noclone",
+ "noinline" => "noinline",
+ "nonstring" => "__nonstring",
+ "noreturn" => "__noreturn",
+ "packed" => "__packed",
+ "pure" => "__pure",
+ "used" => "__used"
+ );
+
+ if ($attr =~ /^(\w+)\s*(${balanced_parens})?/) {
+ my $curr_attr = $1;
+ my $params = '';
+ $params = $2 if defined($2);
+ $curr_attr =~ s/^[\s_]+|[\s_]+$//g;
+
+ if (exists($attr_list{$curr_attr})) {
+ my $new = $attr_list{$curr_attr};
+ WARN("PREFER_DEFINED_ATTRIBUTE_MACRO",
+ "$new$params is preffered over __attribute__(($attr))\n" . $herecurr);
+ }
+ }
-# Check for __attribute__ aligned, prefer __aligned
- if ($realfile !~ m@\binclude/uapi/@ &&
- $line =~ /\b__attribute__\s*\(\s*\(.*aligned/) {
- WARN("PREFER_ALIGNED",
- "__aligned(size) is preferred over __attribute__((aligned(size)))\n" . $herecurr);
- }
+ # Check for __attribute__ format(printf, prefer __printf
+ if ($attr =~ /^_*format_*\s*\(\s*printf/) {
+ if (WARN("PREFER_DEFINED_ATTRIBUTE_MACRO",
+ "__printf(string-index, first-to-check) is preferred over __attribute__((format(printf, string-index, first-to-check)))\n" . $herecurr) &&
+ $fix) {
+ $fixed[$fixlinenr] =~ s/\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf\s*,\s*(.*)\)\s*\)\s*\)/"__printf(" . trim($1) . ")"/ex;
-# Check for __attribute__ section, prefer __section
- if ($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/) {
- if (WARN("PREFER_PRINTF",
- "__printf(string-index, first-to-check) is preferred over __attribute__((format(printf, string-index, first-to-check)))\n" . $herecurr) &&
- $fix) {
- $fixed[$fixlinenr] =~ s/\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf\s*,\s*(.*)\)\s*\)\s*\)/"__printf(" . trim($1) . ")"/ex;
+ # Check for __attribute__ format(scanf, prefer __scanf
+ if ($attr =~ /^_*format_*\s*\(\s*scanf\b/) {
+ if (WARN("PREFER_DEFINED_ATTRIBUTE_MACRO",
+ "__scanf(string-index, first-to-check) is preferred over __attribute__((format(scanf, string-index, first-to-check)))\n" . $herecurr) &&
+ $fix) {
+ $fixed[$fixlinenr] =~ s/\b__attribute__\s*\(\s*\(\s*format\s*\(\s*scanf\s*,\s*(.*)\)\s*\)\s*\)/"__scanf(" . trim($1) . ")"/ex;
+ }
+ }
+ # Check for __attribute__ section, prefer __section
+ if ($attr =~ /^_*section_*\s*\(\s*("[^"]*")/) {
+ my $old = substr($rawline, $-[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($new)/;
+ }
}
- }
-# Check for __attribute__ format(scanf, prefer __scanf
- if ($realfile !~ m@\binclude/uapi/@ &&
- $line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*scanf\b/) {
- if (WARN("PREFER_SCANF",
- "__scanf(string-index, first-to-check) is preferred over __attribute__((format(scanf, string-index, first-to-check)))\n" . $herecurr) &&
- $fix) {
- $fixed[$fixlinenr] =~ s/\b__attribute__\s*\(\s*\(\s*format\s*\(\s*scanf\s*,\s*(.*)\)\s*\)\s*\)/"__scanf(" . trim($1) . ")"/ex;
+ # Check for __attribute__ unused, prefer __always_unused or __maybe_unused
+ if ($attr =~ /^_*unused/) {
+ WARN("PREFER_DEFINED_ATTRIBUTE_MACRO",
+ "__always_unused or __maybe_unused is preferred over __attribute__((__unused__))\n" . $herecurr);
}
}
--
2.27.0
next reply other threads:[~2020-10-24 9:06 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-24 9:05 Dwaipayan Ray [this message]
2020-10-24 20:20 ` [PATCH v3] checkpatch: extend attributes check to handle more patterns Dwaipayan Ray
2020-10-24 23:21 ` Joe Perches
2020-10-24 23:29 ` Randy Dunlap
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