[PATCH 43/62] mm/slub: Convert object_err() to take a struct slab

["Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>]

Improves type safety and removes a lot of calls to slab_page().
Also make object_err() static.

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
 include/linux/slub_def.h |  3 ---
 mm/slub.c                | 20 +++++++++++---------
 2 files changed, 11 insertions(+), 12 deletions(-)

diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index 3cc64e9f988c..63eae033d713 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -165,9 +165,6 @@ static inline void sysfs_slab_release(struct kmem_cache *s)
 }
 #endif
 
-void object_err(struct kmem_cache *s, struct page *page,
-		u8 *object, char *reason);
-
 void *fixup_red_left(struct kmem_cache *s, void *p);
 
 static inline void *nearest_obj(struct kmem_cache *cache, struct page *page,
diff --git a/mm/slub.c b/mm/slub.c
index 524e3c7eac30..a93a6d679de2 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -799,12 +799,15 @@ static void slab_fix(struct kmem_cache *s, char *fmt, ...)
 	va_end(args);
 }
 
+static void object_err(struct kmem_cache *s, struct slab *slab,
+		u8 *object, char *reason);
+
 static bool freelist_corrupted(struct kmem_cache *s, struct slab *slab,
 			       void **freelist, void *nextfree)
 {
 	if ((s->flags & SLAB_CONSISTENCY_CHECKS) &&
 	    !check_valid_pointer(s, slab, nextfree) && freelist) {
-		object_err(s, slab_page(slab), *freelist, "Freechain corrupt");
+		object_err(s, slab, *freelist, "Freechain corrupt");
 		*freelist = NULL;
 		slab_fix(s, "Isolate corrupted freechain");
 		return true;
@@ -852,14 +855,14 @@ static void print_trailer(struct kmem_cache *s, struct page *page, u8 *p)
 	dump_stack();
 }
 
-void object_err(struct kmem_cache *s, struct page *page,
+static void object_err(struct kmem_cache *s, struct slab *slab,
 			u8 *object, char *reason)
 {
 	if (slab_add_kunit_errors())
 		return;
 
 	slab_bug(s, "%s", reason);
-	print_trailer(s, page, object);
+	print_trailer(s, slab_page(slab), object);
 	add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE);
 }
 
@@ -1073,7 +1076,7 @@ static int check_object(struct kmem_cache *s, struct slab *slab,
 
 	/* Check free pointer validity */
 	if (!check_valid_pointer(s, slab, get_freepointer(s, p))) {
-		object_err(s, slab_page(slab), p, "Freepointer corrupt");
+		object_err(s, slab, p, "Freepointer corrupt");
 		/*
 		 * No choice but to zap it and thus lose the remainder
 		 * of the free objects in this slab. May cause
@@ -1127,7 +1130,7 @@ static int on_freelist(struct kmem_cache *s, struct slab *slab, void *search)
 			return 1;
 		if (!check_valid_pointer(s, slab, fp)) {
 			if (object) {
-				object_err(s, slab_page(slab), object,
+				object_err(s, slab, object,
 					"Freechain corrupt");
 				set_freepointer(s, object, NULL);
 			} else {
@@ -1267,7 +1270,7 @@ static inline int alloc_consistency_checks(struct kmem_cache *s,
 		return 0;
 
 	if (!check_valid_pointer(s, slab, object)) {
-		object_err(s, slab_page(slab), object, "Freelist Pointer check fails");
+		object_err(s, slab, object, "Freelist Pointer check fails");
 		return 0;
 	}
 
@@ -1316,7 +1319,7 @@ static inline int free_consistency_checks(struct kmem_cache *s,
 	}
 
 	if (on_freelist(s, slab, object)) {
-		object_err(s, slab_page(slab), object, "Object already free");
+		object_err(s, slab, object, "Object already free");
 		return 0;
 	}
 
@@ -1332,8 +1335,7 @@ static inline int free_consistency_checks(struct kmem_cache *s,
 			       object);
 			dump_stack();
 		} else
-			object_err(s, slab_page(slab), object,
-					"slab pointer corrupt.");
+			object_err(s, slab, object, "slab pointer corrupt.");
 		return 0;
 	}
 	return 1;
-- 
2.32.0