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-rwxr-xr-xscripts/checkpatch.pl46
1 files changed, 45 insertions, 1 deletions
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 880fde13d9b8..7d16f863edf1 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -74,6 +74,8 @@ my $git_command ='export LANGUAGE=en_US.UTF-8; git';
my $tabsize = 8;
my ${CONFIG_} = "CONFIG_";
+my %maybe_linker_symbol; # for externs in c exceptions, when seen in *vmlinux.lds.h
+
sub help {
my ($exitcode) = @_;
@@ -3270,7 +3272,7 @@ sub process {
# A Fixes:, link or signature tag line
$commit_log_possible_stack_dump)) {
WARN("COMMIT_LOG_LONG_LINE",
- "Possible unwrapped commit description (prefer a maximum 75 chars per line)\n" . $herecurr);
+ "Prefer a maximum 75 chars per line (possible unwrapped commit description?)\n" . $herecurr);
$commit_log_long_line = 1;
}
@@ -6051,6 +6053,9 @@ sub process {
# check for line continuations outside of #defines, preprocessor #, and asm
+ } elsif ($realfile =~ m@/vmlinux.lds.h$@) {
+ $line =~ s/(\w+)/$maybe_linker_symbol{$1}++/ge;
+ #print "REAL: $realfile\nln: $line\nkeys:", sort keys %maybe_linker_symbol;
} else {
if ($prevline !~ /^..*\\$/ &&
$line !~ /^\+\s*\#.*\\$/ && # preprocessor
@@ -7120,6 +7125,21 @@ sub process {
}
} elsif ($realfile =~ /\.c$/ && defined $stat &&
+ $stat =~ /^\+extern struct\s+(\w+)\s+(\w+)\[\];/)
+ {
+ my ($st_type, $st_name) = ($1, $2);
+
+ for my $s (keys %maybe_linker_symbol) {
+ #print "Linker symbol? $st_name : $s\n";
+ goto LIKELY_LINKER_SYMBOL
+ if $st_name =~ /$s/;
+ }
+ WARN("AVOID_EXTERNS",
+ "found a file-scoped extern type:$st_type name:$st_name in .c file\n"
+ . "is this a linker symbol ?\n" . $herecurr);
+ LIKELY_LINKER_SYMBOL:
+
+ } elsif ($realfile =~ /\.c$/ && defined $stat &&
$stat =~ /^.\s*extern\s+/)
{
WARN("AVOID_EXTERNS",
@@ -7457,6 +7477,30 @@ sub process {
}
}
+# Complain about RCU Tasks Trace used outside of BPF (and of course, RCU).
+ our $rcu_trace_funcs = qr{(?x:
+ rcu_read_lock_trace |
+ rcu_read_lock_trace_held |
+ rcu_read_unlock_trace |
+ call_rcu_tasks_trace |
+ synchronize_rcu_tasks_trace |
+ rcu_barrier_tasks_trace |
+ rcu_request_urgent_qs_task
+ )};
+ our $rcu_trace_paths = qr{(?x:
+ kernel/bpf/ |
+ include/linux/bpf |
+ net/bpf/ |
+ kernel/rcu/ |
+ include/linux/rcu
+ )};
+ if ($line =~ /\b($rcu_trace_funcs)\s*\(/) {
+ if ($realfile !~ m{^$rcu_trace_paths}) {
+ WARN("RCU_TASKS_TRACE",
+ "use of RCU tasks trace is incorrect outside BPF or core RCU code\n" . $herecurr);
+ }
+ }
+
# check for lockdep_set_novalidate_class
if ($line =~ /^.\s*lockdep_set_novalidate_class\s*\(/ ||
$line =~ /__lockdep_no_validate__\s*\)/ ) {