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Sat, 24 Oct 2020 23:52:02 -0700 (PDT) From: Dwaipayan Ray To: joe@perches.com Date: Sun, 25 Oct 2020 12:21:34 +0530 Message-Id: <20201025065134.21737-1-dwaipayanray1@gmail.com> X-Mailer: git-send-email 2.27.0 MIME-Version: 1.0 Cc: dwaipayanray1@gmail.com, linux-kernel-mentees@lists.linuxfoundation.org, linux-kernel@vger.kernel.org Subject: [Linux-kernel-mentees] [PATCH v4] checkpatch: extend attributes check to handle more patterns X-BeenThere: linux-kernel-mentees@lists.linuxfoundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-kernel-mentees-bounces@lists.linuxfoundation.org Sender: "Linux-kernel-mentees" 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__ __noinline__ __nonstring__ __noreturn__ __pure__ __unused__ __used__ Also add fixes for the generic attributes check. Link: https://lore.kernel.org/linux-kernel-mentees/3ec15b41754b01666d94b76ce51b9832c2dd577a.camel@perches.com/ Suggested-by: Joe Perches Signed-off-by: Dwaipayan Ray --- scripts/checkpatch.pl | 107 ++++++++++++++++++++++++++++-------------- 1 file changed, 71 insertions(+), 36 deletions(-) diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index 7e505688257a..1b736e9042d2 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -6155,50 +6155,85 @@ 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); - } + $rawline =~ /\b__attribute__\s*\(\s*($balanced_parens)\s*\)/) { + my $attr = $1; + $attr =~ s/\s*\(\s*(.*)\)\s*/$1/; + + my %attr_list = ( + "alias" => "__alias", + "aligned" => "__aligned", + "always_inline" => "__always_inline", + "assume_aligned" => "__assume_aligned", + "cold" => "__cold", + "const" => "__const", + "copy" => "__copy", + "designated_init" => "__designated_init", + "externally_visible" => "__visible", + "gnu_inline" => "__gnu_inline", + "malloc" => "__malloc", + "mode" => "__mode", + "no_caller_saved_registers" => "__no_caller_saved_registers", + "noclone" => "__noclone", + "noinline" => "noinline", + "nonstring" => "__nonstring", + "noreturn" => "__noreturn", + "packed" => "__packed", + "pure" => "__pure", + "used" => "__used" + ); + + if ($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}; + if (WARN("PREFER_DEFINED_ATTRIBUTE_MACRO", + "$new$params is preferred over __attribute__(($attr))\n" . $herecurr) && + $fix) { + $fixed[$fixlinenr] =~ s/\b__attribute__\s*\(\s*\(\s*\Q$attr\E\s*\)\s*\)/$new$params/; + } + } + } -# 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 $old = substr($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($new)/; + } } - } -# Check for __attribute__ format(scanf, prefer __scanf - if ($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 _______________________________________________ Linux-kernel-mentees mailing list Linux-kernel-mentees@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees