From: Matthew Wilcox (Oracle) <willy@infradead.org>
Date: Thu, 30 Sep 2021 03:09:23 +0000 (-0400)
Subject: mm: Convert virt_to_cache() to use struct slab
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=cadebaa6d631287f98fc0f3a69de0fe81cd514d9;p=users%2Fwilly%2Flinux.git

mm: Convert virt_to_cache() to use struct slab

This function is entirely self-contained, so can be converted from
page to slab.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---

diff --git a/mm/slab.h b/mm/slab.h
index 305cc8c7fed8..3c691ef6b492 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -480,13 +480,13 @@ static inline void memcg_slab_free_hook(struct kmem_cache *s,
 
 static inline struct kmem_cache *virt_to_cache(const void *obj)
 {
-	struct page *page;
+	struct slab *slab;
 
-	page = virt_to_head_page(obj);
-	if (WARN_ONCE(!PageSlab(page), "%s: Object is not a Slab page!\n",
+	slab = virt_to_slab(obj);
+	if (WARN_ONCE(!SlabAllocation(slab), "%s: Object is not a Slab page!\n",
 					__func__))
 		return NULL;
-	return page->slab_cache;
+	return slab->slab_cache;
 }
 
 static __always_inline void account_slab_page(struct page *page, int order,