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Older
# warn about unexpectedly long msleep's
if ($line =~ /\bmsleep\s*\((\d+)\);/) {
if ($1 < 20) {
WARN("MSLEEP",
"msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.txt\n" . $line);
# if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
# print "#ifdef in C files should be avoided\n";
# print "$herecurr";
# $clean = 0;
# }
if ($line =~ /^.\s*\#\s*(ifdef|ifndef|elif)\s\s+/) {
ERROR("SPACING",
"exactly one space required after that #$1\n" . $herecurr);
# check for spinlock_t definitions without a comment.
if ($line =~ /^.\s*(struct\s+mutex|spinlock_t)\s+\S+;/ ||
$line =~ /^.\s*(DEFINE_MUTEX)\s*\(/) {
my $which = $1;
if (!ctx_has_comment($first_line, $linenr)) {
CHK("UNCOMMENTED_DEFINITION",
"$1 definition without comment\n" . $herecurr);
}
}
# check for memory barriers without a comment.
if ($line =~ /\b(mb|rmb|wmb|read_barrier_depends|smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/) {
if (!ctx_has_comment($first_line, $linenr)) {
CHK("MEMORY_BARRIER",
"memory barrier without comment\n" . $herecurr);
}
}
# check of hardware specific defines
if ($line =~ m@^.\s*\#\s*if.*\b(__i386__|__powerpc64__|__sun__|__s390x__)\b@ && $realfile !~ m@include/asm-@) {
CHK("ARCH_DEFINES",
"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",
"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/ ||
$line =~ /\b$Inline\s+$Storage\b/) {
ERROR("INLINE_LOCATION",
"inline keyword should sit between storage class and type\n" . $herecurr);
# Check for __inline__ and __inline, prefer inline
if ($line =~ /\b(__inline__|__inline)\b/) {
WARN("INLINE",
"plain inline is preferred over $1\n" . $herecurr);
# Check for __attribute__ packed, prefer __packed
if ($line =~ /\b__attribute__\s*\(\s*\(.*\bpacked\b/) {
WARN("PREFER_PACKED",
"__packed is preferred over __attribute__((packed))\n" . $herecurr);
# Check for __attribute__ aligned, prefer __aligned
if ($line =~ /\b__attribute__\s*\(\s*\(.*aligned/) {
WARN("PREFER_ALIGNED",
"__aligned(size) is preferred over __attribute__((aligned(size)))\n" . $herecurr);
# check for sizeof(&)
if ($line =~ /\bsizeof\s*\(\s*\&/) {
WARN("SIZEOF_ADDRESS",
"sizeof(& should be avoided\n" . $herecurr);
# check for line continuations in quoted strings with odd counts of "
if ($rawline =~ /\\$/ && $rawline =~ tr/"/"/ % 2) {
WARN("LINE_CONTINUATIONS",
"Avoid line continuations in quoted strings\n" . $herecurr);
# check for new externs in .c files.
if ($realfile =~ /\.c$/ && defined $stat &&
$stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
my $function_name = $1;
my $paren_space = $2;
my $s = $stat;
if (defined $cond) {
substr($s, 0, length($cond), '');
}
if ($s =~ /^\s*;/ &&
$function_name ne 'uninitialized_var')
{
WARN("AVOID_EXTERNS",
"externs should be avoided in .c files\n" . $herecurr);
}
if ($paren_space =~ /\n/) {
WARN("FUNCTION_ARGUMENTS",
"arguments for function declarations should follow identifier\n" . $herecurr);
} elsif ($realfile =~ /\.c$/ && defined $stat &&
$stat =~ /^.\s*extern\s+/)
{
WARN("AVOID_EXTERNS",
"externs should be avoided in .c files\n" . $herecurr);
}
# checks for new __setup's
if ($rawline =~ /\b__setup\("([^"]*)"/) {
my $name = $1;
if (!grep(/$name/, @setup_docs)) {
CHK("UNDOCUMENTED_SETUP",
"__setup appears un-documented -- check Documentation/kernel-parameters.txt\n" . $herecurr);
# check for pointless casting of kmalloc return
Joe Perches
committed
if ($line =~ /\*\s*\)\s*[kv][czm]alloc(_node){0,1}\b/) {
WARN("UNNECESSARY_CASTS",
"unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr);
Joe Perches
committed
# check for multiple semicolons
if ($line =~ /;\s*;\s*$/) {
WARN("ONE_SEMICOLON",
"Statements terminations use 1 semicolon\n" . $herecurr);
Joe Perches
committed
}
# check for gcc specific __FUNCTION__
if ($line =~ /__FUNCTION__/) {
WARN("USE_FUNC",
"__func__ should be used instead of gcc specific __FUNCTION__\n" . $herecurr);
# check for semaphores initialized locked
if ($line =~ /^.\s*sema_init.+,\W?0\W?\)/) {
WARN("CONSIDER_COMPLETION",
"consider using a completion\n" . $herecurr);
# recommend kstrto* over simple_strto*
if ($line =~ /\bsimple_(strto.*?)\s*\(/) {
WARN("CONSIDER_KSTRTO",
"consider using kstrto* in preference to simple_$1\n" . $herecurr);
# check for __initcall(), use device_initcall() explicitly please
if ($line =~ /^.\s*__initcall\s*\(/) {
WARN("USE_DEVICE_INITCALL",
"please use device_initcall() instead of __initcall()\n" . $herecurr);
}
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# 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/ &&
$line =~ /\bstruct\s+($struct_ops)\b/) {
WARN("CONST_STRUCT",
"struct $1 should normally be const\n" .
$herecurr);
# use of NR_CPUS is usually wrong
# ignore definitions of NR_CPUS and usage to define arrays as likely right
if ($line =~ /\bNR_CPUS\b/ &&
$line !~ /^.\s*\s*#\s*if\b.*\bNR_CPUS\b/ &&
$line !~ /^.\s*\s*#\s*define\b.*\bNR_CPUS\b/ &&
$line !~ /^.\s*$Declare\s.*\[[^\]]*NR_CPUS[^\]]*\]/ &&
$line !~ /\[[^\]]*\.\.\.[^\]]*NR_CPUS[^\]]*\]/ &&
$line !~ /\[[^\]]*NR_CPUS[^\]]*\.\.\.[^\]]*\]/)
WARN("NR_CPUS",
"usage of NR_CPUS is often wrong - consider using cpu_possible(), num_possible_cpus(), for_each_possible_cpu(), etc\n" . $herecurr);
# check for %L{u,d,i} in strings
my $string;
while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
$string = substr($rawline, $-[1], $+[1] - $-[1]);
$string =~ s/%%/__/g;
if ($string =~ /(?<!%)%L[udi]/) {
WARN("PRINTF_L",
"\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr);
# whine mightly about in_atomic
if ($line =~ /\bin_atomic\s*\(/) {
if ($realfile =~ m@^drivers/@) {
ERROR("IN_ATOMIC",
"do not use in_atomic in drivers\n" . $herecurr);
} elsif ($realfile !~ m@^kernel/@) {
WARN("IN_ATOMIC",
"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",
"lockdep_no_validate class is reserved for device->mutex.\n" . $herecurr);
if ($line =~ /debugfs_create_file.*S_IWUGO/ ||
$line =~ /DEVICE_ATTR.*S_IWUGO/ ) {
WARN("EXPORTED_WORLD_WRITABLE",
"Exporting world writable files is usually an error. Consider more restrictive permissions.\n" . $herecurr);
# Check for memset with swapped arguments
if ($line =~ /memset.*\,(\ |)(0x|)0(\ |0|)\);/) {
ERROR("MEMSET",
"memset size is 3rd argument, not the second.\n" . $herecurr);
}
# If we have no input at all, then there is nothing to report on
# so just keep quiet.
if ($#rawlines == -1) {
exit(0);
# In mailback mode only produce a report in the negative, for
# things that appear to be patches.
if ($mailback && ($clean == 1 || !$is_patch)) {
exit(0);
}
# This is not a patch, and we are are in 'no-patch' mode so
# just keep quiet.
if (!$chk_patch && !$is_patch) {
exit(0);
}
if (!$is_patch) {
ERROR("NOT_UNIFIED_DIFF",
"Does not appear to be a unified-diff format patch\n");
}
if ($is_patch && $chk_signoff && $signoff == 0) {
ERROR("MISSING_SIGN_OFF",
"Missing Signed-off-by: line(s)\n");
if ($summary && !($clean == 1 && $quiet == 1)) {
print "$filename " if ($summary_file);
print "total: $cnt_error errors, $cnt_warn warnings, " .
(($check)? "$cnt_chk checks, " : "") .
"$cnt_lines lines checked\n";
print "\n" if ($quiet == 0);
if ($quiet == 0) {
# If there were whitespace errors which cleanpatch can fix
# then suggest that.
if ($rpt_cleaners) {
print "NOTE: whitespace errors detected, you may wish to use scripts/cleanpatch or\n";
print " scripts/cleanfile\n\n";
}
}
if (keys %ignore_type) {
print "NOTE: Ignored message types:";
foreach my $ignore (sort keys %ignore_type) {
print " $ignore";
}
print "\n";
print "\n" if ($quiet == 0);
}
print "$vname has no obvious style problems and is ready for submission.\n"
}
if ($clean == 0 && $quiet == 0) {
print << "EOM";
$vname has style problems, please review.
If any of these errors are false positives, please report
them to the maintainer, see CHECKPATCH in MAINTAINERS.
EOM