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-rwxr-xr-xscripts/checkpatch.pl147
1 files changed, 139 insertions, 8 deletions
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 3257d3d96767..2039acdf5122 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -145,11 +145,14 @@ our $Sparse = qr{
__kprobes|
__ref
}x;
+
+# Notes to $Attribute:
+# We need \b after 'init' otherwise 'initconst' will cause a false positive in a check
our $Attribute = qr{
const|
__read_mostly|
__kprobes|
- __(?:mem|cpu|dev|)(?:initdata|init)|
+ __(?:mem|cpu|dev|)(?:initdata|initconst|init\b)|
____cacheline_aligned|
____cacheline_aligned_in_smp|
____cacheline_internodealigned_in_smp|
@@ -189,6 +192,14 @@ our $typeTypedefs = qr{(?x:
atomic_t
)};
+our $logFunctions = qr{(?x:
+ printk|
+ pr_(debug|dbg|vdbg|devel|info|warning|err|notice|alert|crit|emerg|cont)|
+ (dev|netdev|netif)_(printk|dbg|vdbg|info|warn|err|notice|alert|crit|emerg|WARN)|
+ WARN|
+ panic
+)};
+
our @typeList = (
qr{void},
qr{(?:unsigned\s+)?char},
@@ -213,6 +224,12 @@ our @modifierList = (
qr{fastcall},
);
+our $allowed_asm_includes = qr{(?x:
+ irq|
+ memory
+)};
+# memory.h: ARM has a custom one
+
sub build_types {
my $mods = "(?x: \n" . join("|\n ", @modifierList) . "\n)";
my $all = "(?x: \n" . join("|\n ", @typeList) . "\n)";
@@ -541,6 +558,9 @@ sub ctx_statement_block {
$type = ($level != 0)? '{' : '';
if ($level == 0) {
+ if (substr($blk, $off + 1, 1) eq ';') {
+ $off++;
+ }
last;
}
}
@@ -1371,18 +1391,39 @@ 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 ($realfile !~ /\.(h|c|s|S|pl|sh)$/);
#80 column limit
if ($line =~ /^\+/ && $prevrawline !~ /\/\*\*/ &&
$rawline !~ /^.\s*\*\s*\@$Ident\s/ &&
- $line !~ /^\+\s*printk\s*\(\s*(?:KERN_\S+\s*)?"[X\t]*"\s*(?:,|\)\s*;)\s*$/ &&
+ !($line =~ /^\+\s*$logFunctions\s*\(\s*(?:(KERN_\S+\s*|[^"]*))?"[X\t]*"\s*(?:,|\)\s*;)\s*$/ ||
+ $line =~ /^\+\s*"[^"]*"\s*(?:\s*|,|\)\s*;)\s*$/) &&
$length > 80)
{
WARN("line over 80 characters\n" . $herecurr);
}
+# check for spaces before a quoted newline
+ if ($rawline =~ /^.*\".*\s\\n/) {
+ WARN("unnecessary whitespace before a quoted newline\n" . $herecurr);
+ }
+
# check for adding lines without a newline.
if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/) {
WARN("adding a line without newline at end of file\n" . $herecurr);
@@ -1411,6 +1452,19 @@ sub process {
ERROR("code indent should use tabs where possible\n" . $herevet);
}
+# check for space before tabs.
+ if ($rawline =~ /^\+/ && $rawline =~ / \t/) {
+ my $herevet = "$here\n" . cat_vet($rawline) . "\n";
+ WARN("please, no space before tabs\n" . $herevet);
+ }
+
+# check for spaces at the beginning of a line.
+ if ($rawline =~ /^\+ / && $rawline !~ /\+ +\*/) {
+ my $herevet = "$here\n" . cat_vet($rawline) . "\n";
+ WARN("please, no space for starting a line, \
+ excluding comments\n" . $herevet);
+ }
+
# check we are in a valid C source file if not then ignore this hunk
next if ($realfile !~ /\.(h|c)$/);
@@ -1741,9 +1795,9 @@ sub process {
WARN("EXPORT_SYMBOL(foo); should immediately follow its function/variable\n" . $herecurr);
}
-# check for external initialisers.
+# check for global initialisers.
if ($line =~ /^.$Type\s*$Ident\s*(?:\s+$Modifier)*\s*=\s*(0|NULL|false)\s*;/) {
- ERROR("do not initialise externals to 0 or NULL\n" .
+ ERROR("do not initialise globals to 0 or NULL\n" .
$herecurr);
}
# check for static initialisers.
@@ -2182,8 +2236,10 @@ sub process {
# Find out how long the conditional actually is.
my @newlines = ($c =~ /\n/gs);
my $cond_lines = 1 + $#newlines;
+ my $stat_real = '';
- my $stat_real = raw_line($linenr, $cond_lines);
+ $stat_real = raw_line($linenr, $cond_lines)
+ . "\n" if ($cond_lines);
if (defined($stat_real) && $cond_lines > 1) {
$stat_real = "[...]\n$stat_real";
}
@@ -2269,7 +2325,7 @@ sub process {
my $checkfile = "include/linux/$file";
if (-f "$root/$checkfile" &&
$realfile ne $checkfile &&
- $1 ne 'irq')
+ $1 !~ /$allowed_asm_includes/)
{
if ($realfile =~ m{^arch/}) {
CHK("Consider using #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
@@ -2348,6 +2404,8 @@ sub process {
DECLARE_PER_CPU|
DEFINE_PER_CPU|
__typeof__\(|
+ union|
+ struct|
\.$Ident\s*=\s*|
^\"|\"$
}x;
@@ -2529,6 +2587,21 @@ sub process {
}
}
+# prefer usleep_range over udelay
+ if ($line =~ /\budelay\s*\(\s*(\w+)\s*\)/) {
+ # ignore udelay's < 10, however
+ if (! (($1 =~ /(\d+)/) && ($1 < 10)) ) {
+ CHK("usleep_range is preferred over udelay; see Documentation/timers/timers-howto.txt\n" . $line);
+ }
+ }
+
+# warn about unexpectedly long msleep's
+ if ($line =~ /\bmsleep\s*\((\d+)\);/) {
+ if ($1 < 20) {
+ WARN("msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.txt\n" . $line);
+ }
+ }
+
# warn about #ifdefs in C files
# if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
# print "#ifdef in C files should be avoided\n";
@@ -2560,6 +2633,11 @@ 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/ ||
@@ -2572,6 +2650,11 @@ sub process {
WARN("plain inline is preferred over $1\n" . $herecurr);
}
+# check for sizeof(&)
+ if ($line =~ /\bsizeof\s*\(\s*\&/) {
+ WARN("sizeof(& should be avoided\n" . $herecurr);
+ }
+
# check for new externs in .c files.
if ($realfile =~ /\.c$/ && defined $stat &&
$stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
@@ -2625,6 +2708,7 @@ 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*\(/) {
@@ -2634,9 +2718,46 @@ sub process {
if ($line =~ /^.\s*__initcall\s*\(/) {
WARN("please use device_initcall() instead of __initcall()\n" . $herecurr);
}
-# check for struct file_operations, ensure they are const.
+# check for various ops structs, ensure they are const.
+ my $struct_ops = qr{acpi_dock_ops|
+ address_space_operations|
+ backlight_ops|
+ block_device_operations|
+ dentry_operations|
+ dev_pm_ops|
+ dma_map_ops|
+ extent_io_ops|
+ file_lock_operations|
+ file_operations|
+ hv_ops|
+ ide_dma_ops|
+ intel_dvo_dev_ops|
+ item_operations|
+ iwl_ops|
+ kgdb_arch|
+ kgdb_io|
+ kset_uevent_ops|
+ lock_manager_operations|
+ microcode_ops|
+ mtrr_ops|
+ neigh_ops|
+ nlmsvc_binding|
+ pci_raw_ops|
+ pipe_buf_operations|
+ platform_hibernation_ops|
+ platform_suspend_ops|
+ proto_ops|
+ rpc_pipe_ops|
+ seq_operations|
+ snd_ac97_build_ops|
+ soc_pcmcia_socket_ops|
+ stacktrace_ops|
+ sysfs_ops|
+ tty_operations|
+ usb_mon_operations|
+ wd_ops}x;
if ($line !~ /\bconst\b/ &&
- $line =~ /\bstruct\s+(file_operations|seq_operations)\b/) {
+ $line =~ /\bstruct\s+($struct_ops)\b/) {
WARN("struct $1 should normally be const\n" .
$herecurr);
}
@@ -2672,6 +2793,16 @@ 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