liveupdate: luo_file: Use private list

Switch LUO to use the private list iterators.

Link: https://lkml.kernel.org/r/20251218155752.3045808-4-pasha.tatashin@soleen.com
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Alexander Graf <graf@amazon.com>
Cc: David Gow <davidgow@google.com>
Cc: David Matlack <dmatlack@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kees Cook <kees@kernel.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Pratyush Yadav <pratyush@kernel.org>
Cc: Samiullah Khawaja <skhawaja@google.com>
Cc: Tamir Duberstein <tamird@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: soleen

kernel/liveupdate/luo_file.c

@@ -104,6 +104,7 @@
 #include <linux/io.h>
 #include <linux/kexec_handover.h>
 #include <linux/kho/abi/luo.h>
+#include <linux/list_private.h>
 #include <linux/liveupdate.h>
 #include <linux/module.h>
 #include <linux/sizes.h>
@@ -273,7 +274,7 @@ int luo_preserve_file(struct luo_file_set *file_set, u64 token, int fd)
 		goto  err_fput;
 
 	err = -ENOENT;
-	luo_list_for_each_private(fh, &luo_file_handler_list, list) {
+	list_private_for_each_entry(fh, &luo_file_handler_list, list) {
 		if (fh->ops->can_preserve(fh, file)) {
 			err = 0;
 			break;
@@ -760,7 +761,7 @@ int luo_file_deserialize(struct luo_file_set *file_set,
 		bool handler_found = false;
 		struct luo_file *luo_file;
 
-		luo_list_for_each_private(fh, &luo_file_handler_list, list) {
+		list_private_for_each_entry(fh, &luo_file_handler_list, list) {
 			if (!strcmp(fh->compatible, file_ser[i].compatible)) {
 				handler_found = true;
 				break;
@@ -835,7 +836,7 @@ int liveupdate_register_file_handler(struct liveupdate_file_handler *fh)
 		return -EBUSY;
 
 	/* Check for duplicate compatible strings */
-	luo_list_for_each_private(fh_iter, &luo_file_handler_list, list) {
+	list_private_for_each_entry(fh_iter, &luo_file_handler_list, list) {
 		if (!strcmp(fh_iter->compatible, fh->compatible)) {
 			pr_err("File handler registration failed: Compatible string '%s' already registered.\n",
 			       fh->compatible);

kernel/liveupdate/luo_internal.h

@@ -40,13 +40,6 @@ static inline int luo_ucmd_respond(struct luo_ucmd *ucmd,
  */
 #define luo_restore_fail(__fmt, ...) panic(__fmt, ##__VA_ARGS__)
 
-/* Mimics list_for_each_entry() but for private list head entries */
-#define luo_list_for_each_private(pos, head, member)				\
-	for (struct list_head *__iter = (head)->next;				\
-	     __iter != (head) &&						\
-	     ({ pos = container_of(__iter, typeof(*(pos)), member); 1; });	\
-	     __iter = __iter->next)
-
 /**
  * struct luo_file_set - A set of files that belong to the same sessions.
  * @files_list: An ordered list of files associated with this session, it is