From 1704f47b50b5d9e1b825e43e1baaf2c5897baf03 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Fri, 19 Mar 2010 01:37:42 +0100 Subject: lockdep: Add novalidate class for dev->mutex conversion The conversion of device->sem to device->mutex resulted in lockdep warnings. Create a novalidate class for now until the driver folks come up with separate classes. That way we have at least the basic mutex debugging coverage. Add a checkpatch error so the usage is reserved for device->mutex. [ tglx: checkpatch and compile fix for LOCKDEP=n ] Signed-off-by: Peter Zijlstra Signed-off-by: Thomas Gleixner Signed-off-by: Greg Kroah-Hartman --- scripts/checkpatch.pl | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'scripts/checkpatch.pl') diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index a4d74344d805..f2bbea900700 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -2656,6 +2656,7 @@ sub process { # check for semaphores used as mutexes if ($line =~ /^.\s*init_MUTEX_LOCKED\s*\(/) { WARN("consider using a completion\n" . $herecurr); + } # recommend strict_strto* over simple_strto* if ($line =~ /\bsimple_(strto.*?)\s*\(/) { @@ -2740,6 +2741,16 @@ sub process { WARN("use of in_atomic() is incorrect outside core kernel code\n" . $herecurr); } } + +# check for lockdep_set_novalidate_class + if ($line =~ /^.\s*lockdep_set_novalidate_class\s*\(/ || + $line =~ /__lockdep_no_validate__\s*\)/ ) { + if ($realfile !~ m@^kernel/lockdep@ && + $realfile !~ m@^include/linux/lockdep@ && + $realfile !~ m@^drivers/base/core@) { + ERROR("lockdep_no_validate class is reserved for device->mutex.\n" . $herecurr); + } + } } # If we have no input at all, then there is nothing to report on -- cgit v1.2.3 From 3354957a4f8b9bb4b43625232acdf0626851c82f Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Mon, 24 May 2010 14:33:29 -0700 Subject: checkpatch: add check for too short Kconfig descriptions I've seen various new Kconfigs with rather unhelpful one liner descriptions. Add a Kconfig warning for a minimum length of the Kconfig help section. Right now I arbitarily chose 4. The exact value can be debated. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Andi Kleen Cc: Andy Whitcroft Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- scripts/checkpatch.pl | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'scripts/checkpatch.pl') diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index f2bbea900700..de0f4672cb74 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -1382,6 +1382,21 @@ sub process { ERROR("trailing whitespace\n" . $herevet); } +# check for Kconfig help text having a real description + if ($realfile =~ /Kconfig/ && + $line =~ /\+?\s*(---)?help(---)?$/) { + my $length = 0; + for (my $l = $linenr; defined($lines[$l]); $l++) { + my $f = $lines[$l]; + $f =~ s/#.*//; + $f =~ s/^\s+//; + next if ($f =~ /^$/); + last if ($f =~ /^\s*config\s/); + $length++; + } + WARN("please write a paragraph that describes the config symbol fully\n" . $herecurr) if ($length < 4); + } + # check we are in a valid source file if not then ignore this hunk next if ($realfile !~ /\.(h|c|s|S|pl|sh)$/); -- cgit v1.2.3 From d4977c78e9c7dd042f96f4a21d957bc25a561333 Mon Sep 17 00:00:00 2001 From: Tobias Klauser Date: Mon, 24 May 2010 14:33:30 -0700 Subject: checkpatch: warn on declaration with storage class not at the beginning The C99 specification states in section 6.11.5: The placement of a storage-class specifier other than at the beginning of the declaration specifiers in a declaration is an obsolescent feature. Signed-off-by: Tobias Klauser Acked-by: Jean Delvare Cc: Andy Whitcroft Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- scripts/checkpatch.pl | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'scripts/checkpatch.pl') diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index de0f4672cb74..bd88f11b0953 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -2601,6 +2601,11 @@ sub process { CHK("architecture specific defines should be avoided\n" . $herecurr); } +# Check that the storage class is at the beginning of a declaration + if ($line =~ /\b$Storage\b/ && $line !~ /^.\s*$Storage\b/) { + WARN("storage class should be at the beginning of the declaration\n" . $herecurr) + } + # check the location of the inline attribute, that it is between # storage class and type. if ($line =~ /\b$Type\s+$Inline\b/ || -- cgit v1.2.3