Merge tag 'mm-nonmm-stable-2025-05-31-15-28' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull non-MM updates from Andrew Morton:

 - "hung_task: extend blocking task stacktrace dump to semaphore" from
   Lance Yang enhances the hung task detector.

   The detector presently dumps the blocking tasks's stack when it is
   blocked on a mutex. Lance's series extends this to semaphores

 - "nilfs2: improve sanity checks in dirty state propagation" from
   Wentao Liang addresses a couple of minor flaws in nilfs2

 - "scripts/gdb: Fixes related to lx_per_cpu()" from Illia Ostapyshyn
   fixes a couple of issues in the gdb scripts

 - "Support kdump with LUKS encryption by reusing LUKS volume keys" from
   Coiby Xu addresses a usability problem with kdump.

   When the dump device is LUKS-encrypted, the kdump kernel may not have
   the keys to the encrypted filesystem. A full writeup of this is in
   the series [0/N] cover letter

 - "sysfs: add counters for lockups and stalls" from Max Kellermann adds
   /sys/kernel/hardlockup_count and /sys/kernel/hardlockup_count and
   /sys/kernel/rcu_stall_count

 - "fork: Page operation cleanups in the fork code" from Pasha Tatashin
   implements a number of code cleanups in fork.c

 - "scripts/gdb/symbols: determine KASLR offset on s390 during early
   boot" from Ilya Leoshkevich fixes some s390 issues in the gdb
   scripts

* tag 'mm-nonmm-stable-2025-05-31-15-28' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (67 commits)
  llist: make llist_add_batch() a static inline
  delayacct: remove redundant code and adjust indentation
  squashfs: add optional full compressed block caching
  crash_dump, nvme: select CONFIGFS_FS as built-in
  scripts/gdb/symbols: determine KASLR offset on s390 during early boot
  scripts/gdb/symbols: factor out pagination_off()
  scripts/gdb/symbols: factor out get_vmlinux()
  kernel/panic.c: format kernel-doc comments
  mailmap: update and consolidate Casey Connolly's name and email
  nilfs2: remove wbc->for_reclaim handling
  fork: define a local GFP_VMAP_STACK
  fork: check charging success before zeroing stack
  fork: clean-up naming of vm_stack/vm_struct variables in vmap stacks code
  fork: clean-up ifdef logic around stack allocation
  kernel/rcu/tree_stall: add /sys/kernel/rcu_stall_count
  kernel/watchdog: add /sys/kernel/{hard,soft}lockup_count
  x86/crash: make the page that stores the dm crypt keys inaccessible
  x86/crash: pass dm crypt keys to kdump kernel
  Revert "x86/mm: Remove unused __set_memory_prot()"
  crash_dump: retrieve dm crypt keys in kdump kernel
  ...

1 files changed, 28 insertions, 7 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 966813c2573c..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{$_}++ } @_;
@@ -5885,9 +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;
@@ -5940,10 +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|
@@ -5978,11 +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");
 				}
 
 			}
@@ -6026,7 +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");
 				}