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Message-Id: <20201023094307.20820-1-dwaipayanray1@gmail.com>
Date: Fri, 23 Oct 2020 15:13:07 +0530
From: Dwaipayan Ray <dwaipayanray1@...il.com>
To: joe@...ches.com
Cc: linux-kernel-mentees@...ts.linuxfoundation.org,
dwaipayanray1@...il.com, linux-kernel@...r.kernel.org,
lukas.bulwahn@...il.com
Subject: [PATCH RFC v2] checkpatch: extend attributes check to handle more patterns
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@...ches.com>
Signed-off-by: Dwaipayan Ray <dwaipayanray1@...il.com>
---
scripts/checkpatch.pl | 130 ++++++++++++++++++++++++++++++------------
1 file changed, 94 insertions(+), 36 deletions(-)
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 7e505688257a..69324c2e55d6 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -6155,50 +6155,108 @@ 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 =~ /\b__attribute__\s*\(\s*\((.*)\)\s*\)/) {
+ my $attr = trim($1);
+
+ my $attr_list = qr {
+ __alias__|
+ __aligned__$|
+ __aligned__\(.*\)|
+ __always_inline__|
+ __assume_aligned__\(.*\)|
+ __cold__|
+ __const__|
+ __copy__\(.*\)|
+ __designated_init__|
+ __externally_visible__|
+ __fallthrough__|
+ __gnu_inline__|
+ __malloc__|
+ __mode__\(.*\)|
+ __no_caller_saved_registers__|
+ __noclone__|
+ __noinline__|
+ __nonstring__|
+ __noreturn__|
+ __packed__|
+ __pure__|
+ __used__
+ }x;
-# 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" . $herecurr);
- }
+ my %attr_replace = (
+ "__alias__" => "__alias",
+ "__aligned__" => "__aligned_largest",
+ "__aligned__(" => "__aligned",
+ "__always_inline__" => "__always_inline",
+ "__assume_aligned__(" => "__assume_aligned",
+ "__cold__" => "__cold",
+ "__const__" => "__const",
+ "__copy__(" => "__copy",
+ "__designated_init__" => "__designated_init",
+ "__externally_visible__" => "__visible",
+ "__fallthrough__" => "fallthrough",
+ "__gnu_inline__" => "__gnu_inline",
+ "__malloc__" => "__malloc",
+ "__mode__(" => "__mode",
+ "__no_caller_saved_registers__" => "__no_caller_saved_registers",
+ "__noclone__" => "__noclone",
+ "__noinline__" => "noinline",
+ "__nonstring__" => "__nonstring",
+ "__noreturn__" => "__noreturn",
+ "__packed__" => "__packed",
+ "__pure__" => "__pure",
+ "__used__" => "__used"
+ );
+
+ if ($attr =~/^($attr_list)/) {
+ my $old = $1;
+ if ($old =~ /^(__.+__\()(.*)\)/) {
+ my $new = $attr_replace{$1};
+ WARN("PREFER_DEFINED_ATTRIBUTE_MACRO",
+ "$new($2) is preffered over __attribute__(($old))\n" . $herecurr);
+ } else {
+ my $new = $attr_replace{$old};
+ WARN("PREFER_DEFINED_ATTRIBUTE_MACRO",
+ "$new is preffered over __attribute__(($old))\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($new)/;
+ # Check for __attribute__ format(printf, prefer __printf
+ if ($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($1) . ")"/ex;
+
+ }
}
- }
-# Check for __attribute__ format(printf, prefer __printf
- if ($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
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