Merge remote-tracking branch 'drm/drm-next' into msm-next

Back-merge drm-next to (indirectly) get arm-smmu updates for making
stall-on-fault more reliable.

Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>

1 files changed, 32 insertions, 9 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 44e233b6f428..664f7b7a622c 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -151,6 +151,24 @@ EOM
 	exit($exitcode);
 }
 
+my $DO_WHILE_0_ADVICE = q{
+   do {} while (0) advice is over-stated in a few situations:
+
+   The more obvious case is macros, like MODULE_PARM_DESC, invoked at
+   file-scope, where C disallows code (it must be in functions).  See
+   $exceptions if you have one to add by name.
+
+   More troublesome is declarative macros used at top of new scope,
+   like DECLARE_PER_CPU.  These might just compile with a do-while-0
+   wrapper, but would be incorrect.  Most of these are handled by
+   detecting struct,union,etc declaration primitives in $exceptions.
+
+   Theres also macros called inside an if (block), which "return" an
+   expression.  These cannot do-while, and need a ({}) wrapper.
+
+   Enjoy this qualification while we work to improve our heuristics.
+};
+
 sub uniq {
 	my %seen;
 	return grep { !$seen{$_}++ } @_;
@@ -839,6 +857,8 @@ our %deprecated_apis = (
 	"kunmap"				=> "kunmap_local",
 	"kmap_atomic"				=> "kmap_local_page",
 	"kunmap_atomic"				=> "kunmap_local",
+	"srcu_read_lock_lite"			=> "srcu_read_lock_fast",
+	"srcu_read_unlock_lite"			=> "srcu_read_unlock_fast",
 );
 
 #Create a search pattern for all these strings to speed up a loop below
@@ -4804,7 +4824,7 @@ sub process {
 		}
 
 # do not use BUG() or variants
-		if ($line =~ /\b(?!AA_|BUILD_|DCCP_|IDA_|KVM_|RWLOCK_|snd_|SPIN_)(?:[a-zA-Z_]*_)?BUG(?:_ON)?(?:_[A-Z_]+)?\s*\(/) {
+		if ($line =~ /\b(?!AA_|BUILD_|IDA_|KVM_|RWLOCK_|snd_|SPIN_)(?:[a-zA-Z_]*_)?BUG(?:_ON)?(?:_[A-Z_]+)?\s*\(/) {
 			my $msg_level = \&WARN;
 			$msg_level = \&CHK if ($file);
 			&{$msg_level}("AVOID_BUG",
@@ -5883,9 +5903,9 @@ sub process {
 			}
 		}
 
-# multi-statement macros should be enclosed in a do while loop, grab the
-# first statement and ensure its the whole macro if its not enclosed
-# in a known good container
+# Usually multi-statement macros should be enclosed in a do {} while
+# (0) loop.  Grab the first statement and ensure its the whole macro
+# if its not enclosed in a known good container
 		if ($realfile !~ m@/vmlinux.lds.h$@ &&
 		    $line =~ /^.\s*\#\s*define\s*$Ident(\()?/) {
 			my $ln = $linenr;
@@ -5938,10 +5958,13 @@ sub process {
 
 			my $exceptions = qr{
 				$Declare|
+				# named exceptions
 				module_param_named|
 				MODULE_PARM_DESC|
 				DECLARE_PER_CPU|
 				DEFINE_PER_CPU|
+				static_assert|
+				# declaration primitives
 				__typeof__\(|
 				union|
 				struct|
@@ -5976,11 +5999,11 @@ sub process {
 					ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE",
 					      "Macros starting with if should be enclosed by a do - while loop to avoid possible if/else logic defects\n" . "$herectx");
 				} elsif ($dstat =~ /;/) {
-					ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE",
-					      "Macros with multiple statements should be enclosed in a do - while loop\n" . "$herectx");
+					WARN("MULTISTATEMENT_MACRO_USE_DO_WHILE",
+					      "Non-declarative macros with multiple statements should be enclosed in a do - while loop\n" . "$herectx\nBUT SEE:\n$DO_WHILE_0_ADVICE");
 				} else {
 					ERROR("COMPLEX_MACRO",
-					      "Macros with complex values should be enclosed in parentheses\n" . "$herectx");
+					      "Macros with complex values should be enclosed in parentheses\n" . "$herectx\nBUT SEE:\n$DO_WHILE_0_ADVICE");
 				}
 
 			}
@@ -6024,7 +6047,7 @@ sub process {
 				}
 
 # check if this is an unused argument
-				if ($define_stmt !~ /\b$arg\b/) {
+				if ($define_stmt !~ /\b$arg\b/ && $define_stmt) {
 					WARN("MACRO_ARG_UNUSED",
 					     "Argument '$arg' is not used in function-like macro\n" . "$herectx");
 				}
@@ -6891,7 +6914,7 @@ sub process {
 					    ($extension eq "f" &&
 					     defined $qualifier && $qualifier !~ /^w/) ||
 					    ($extension eq "4" &&
-					     defined $qualifier && $qualifier !~ /^c[hnlbc]/)) {
+					     defined $qualifier && $qualifier !~ /^c(?:[hlbc]|hR)$/)) {
 						$bad_specifier = $specifier;
 						last;
 					}