[PATCH 28/62] mm/slub: Convert deactivate_slab() to take a struct slab

["Matthew Wilcox (Oracle)" <willy@infradead.org>]

Improves type safety and removes calls to slab_page().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 mm/slub.c | 54 +++++++++++++++++++++++++++---------------------------
 1 file changed, 27 insertions(+), 27 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index e6fd0619d1f2..5330d0b02f13 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2298,25 +2298,25 @@ static void init_kmem_cache_cpus(struct kmem_cache *s)
 }
 
 /*
- * Finishes removing the cpu slab. Merges cpu's freelist with page's freelist,
+ * Finishes removing the cpu slab. Merges cpu's freelist with slab's freelist,
  * unfreezes the slabs and puts it on the proper list.
  * Assumes the slab has been already safely taken away from kmem_cache_cpu
  * by the caller.
  */
-static void deactivate_slab(struct kmem_cache *s, struct page *page,
+static void deactivate_slab(struct kmem_cache *s, struct slab *slab,
 			    void *freelist)
 {
 	enum slab_modes { M_NONE, M_PARTIAL, M_FULL, M_FREE };
-	struct kmem_cache_node *n = get_node(s, page_to_nid(page));
+	struct kmem_cache_node *n = get_node(s, slab_nid(slab));
 	int lock = 0, free_delta = 0;
 	enum slab_modes l = M_NONE, m = M_NONE;
 	void *nextfree, *freelist_iter, *freelist_tail;
 	int tail = DEACTIVATE_TO_HEAD;
 	unsigned long flags = 0;
-	struct page new;
-	struct page old;
+	struct slab new;
+	struct slab old;
 
-	if (page->freelist) {
+	if (slab->freelist) {
 		stat(s, DEACTIVATE_REMOTE_FREES);
 		tail = DEACTIVATE_TO_TAIL;
 	}
@@ -2335,7 +2335,7 @@ static void deactivate_slab(struct kmem_cache *s, struct page *page,
 		 * 'freelist_iter' is already corrupted.  So isolate all objects
 		 * starting at 'freelist_iter' by skipping them.
 		 */
-		if (freelist_corrupted(s, page, &freelist_iter, nextfree))
+		if (freelist_corrupted(s, slab_page(slab), &freelist_iter, nextfree))
 			break;
 
 		freelist_tail = freelist_iter;
@@ -2345,25 +2345,25 @@ static void deactivate_slab(struct kmem_cache *s, struct page *page,
 	}
 
 	/*
-	 * Stage two: Unfreeze the page while splicing the per-cpu
-	 * freelist to the head of page's freelist.
+	 * Stage two: Unfreeze the slab while splicing the per-cpu
+	 * freelist to the head of slab's freelist.
 	 *
-	 * Ensure that the page is unfrozen while the list presence
+	 * Ensure that the slab is unfrozen while the list presence
 	 * reflects the actual number of objects during unfreeze.
 	 *
 	 * We setup the list membership and then perform a cmpxchg
-	 * with the count. If there is a mismatch then the page
-	 * is not unfrozen but the page is on the wrong list.
+	 * with the count. If there is a mismatch then the slab
+	 * is not unfrozen but the slab is on the wrong list.
 	 *
 	 * Then we restart the process which may have to remove
-	 * the page from the list that we just put it on again
+	 * the slab from the list that we just put it on again
 	 * because the number of objects in the slab may have
 	 * changed.
 	 */
 redo:
 
-	old.freelist = READ_ONCE(page->freelist);
-	old.counters = READ_ONCE(page->counters);
+	old.freelist = READ_ONCE(slab->freelist);
+	old.counters = READ_ONCE(slab->counters);
 	VM_BUG_ON(!old.frozen);
 
 	/* Determine target state of the slab */
@@ -2385,7 +2385,7 @@ static void deactivate_slab(struct kmem_cache *s, struct page *page,
 			lock = 1;
 			/*
 			 * Taking the spinlock removes the possibility
-			 * that acquire_slab() will see a slab page that
+			 * that acquire_slab() will see a slab that
 			 * is frozen
 			 */
 			spin_lock_irqsave(&n->list_lock, flags);
@@ -2405,18 +2405,18 @@ static void deactivate_slab(struct kmem_cache *s, struct page *page,
 
 	if (l != m) {
 		if (l == M_PARTIAL)
-			remove_partial(n, page);
+			remove_partial(n, slab_page(slab));
 		else if (l == M_FULL)
-			remove_full(s, n, page);
+			remove_full(s, n, slab_page(slab));
 
 		if (m == M_PARTIAL)
-			add_partial(n, page, tail);
+			add_partial(n, slab_page(slab), tail);
 		else if (m == M_FULL)
-			add_full(s, n, page);
+			add_full(s, n, slab_page(slab));
 	}
 
 	l = m;
-	if (!cmpxchg_double_slab(s, page,
+	if (!cmpxchg_double_slab(s, slab_page(slab),
 				old.freelist, old.counters,
 				new.freelist, new.counters,
 				"unfreezing slab"))
@@ -2431,7 +2431,7 @@ static void deactivate_slab(struct kmem_cache *s, struct page *page,
 		stat(s, DEACTIVATE_FULL);
 	else if (m == M_FREE) {
 		stat(s, DEACTIVATE_EMPTY);
-		discard_slab(s, page);
+		discard_slab(s, slab_page(slab));
 		stat(s, FREE_SLAB);
 	}
 }
@@ -2603,7 +2603,7 @@ static inline void flush_slab(struct kmem_cache *s, struct kmem_cache_cpu *c)
 	local_unlock_irqrestore(&s->cpu_slab->lock, flags);
 
 	if (slab) {
-		deactivate_slab(s, slab_page(slab), freelist);
+		deactivate_slab(s, slab, freelist);
 		stat(s, CPUSLAB_FLUSH);
 	}
 }
@@ -2619,7 +2619,7 @@ static inline void __flush_cpu_slab(struct kmem_cache *s, int cpu)
 	c->tid = next_tid(c->tid);
 
 	if (slab) {
-		deactivate_slab(s, slab_page(slab), freelist);
+		deactivate_slab(s, slab, freelist);
 		stat(s, CPUSLAB_FLUSH);
 	}
 
@@ -2961,7 +2961,7 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
 	c->slab = NULL;
 	c->freelist = NULL;
 	local_unlock_irqrestore(&s->cpu_slab->lock, flags);
-	deactivate_slab(s, slab_page(slab), freelist);
+	deactivate_slab(s, slab, freelist);
 
 new_slab:
 
@@ -3043,7 +3043,7 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
 
 		local_unlock_irqrestore(&s->cpu_slab->lock, flags);
 
-		deactivate_slab(s, slab_page(flush_slab), flush_freelist);
+		deactivate_slab(s, flush_slab, flush_freelist);
 
 		stat(s, CPUSLAB_FLUSH);
 
@@ -3055,7 +3055,7 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
 
 return_single:
 
-	deactivate_slab(s, slab_page(slab), get_freepointer(s, freelist));
+	deactivate_slab(s, slab, get_freepointer(s, freelist));
 	return freelist;
 }
 
-- 
2.32.0