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2024-02-19 1c055e55a242a33e574e48be530e06770a210dcd

 kernel/include/linux/slub_def.h
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@@ -7,7 +7,9 @@
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  *
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  * (C) 2007 SGI, Christoph Lameter
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  */
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+#include <linux/kfence.h>
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 #include <linux/kobject.h>
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+#include <linux/reciprocal_div.h>
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 enum stat_item {
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 	ALLOC_FASTPATH,		/* Allocation from cpu slab */
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@@ -81,12 +83,13 @@
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  */
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 struct kmem_cache {
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 	struct kmem_cache_cpu __percpu *cpu_slab;
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-	/* Used for retriving partial slabs etc */
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+	/* Used for retrieving partial slabs, etc. */
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 	slab_flags_t flags;
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 	unsigned long min_partial;
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-	unsigned int size;	/* The size of an object including meta data */
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-	unsigned int object_size;/* The size of an object without meta data */
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-	unsigned int offset;	/* Free pointer offset. */
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+	unsigned int size;	/* The size of an object including metadata */
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+	unsigned int object_size;/* The size of an object without metadata */
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+	struct reciprocal_value reciprocal_size;
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+	unsigned int offset;	/* Free pointer offset */
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 #ifdef CONFIG_SLUB_CPU_PARTIAL
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 	/* Number of per cpu partial objects to keep around */
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 	unsigned int cpu_partial;
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@@ -106,17 +109,7 @@
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 	struct list_head list;	/* List of slab caches */
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 #ifdef CONFIG_SLUB_SYSFS
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 	struct kobject kobj;	/* For sysfs */
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-	struct work_struct kobj_remove_work;
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 #endif
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-#ifdef CONFIG_MEMCG
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-	struct memcg_cache_params memcg_params;
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-	/* for propagation, maximum size of a stored attr */
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-	unsigned int max_attr_size;
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-#ifdef CONFIG_SLUB_SYSFS
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-	struct kset *memcg_kset;
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-#endif
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-#endif
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-
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 #ifdef CONFIG_SLAB_FREELIST_HARDENED
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 	unsigned long random;
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 #endif
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@@ -151,7 +144,7 @@
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 #else
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 #define slub_cpu_partial(s)		(0)
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 #define slub_set_cpu_partial(s, n)
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-#endif // CONFIG_SLUB_CPU_PARTIAL
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+#endif /* CONFIG_SLUB_CPU_PARTIAL */
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 #ifdef CONFIG_SLUB_SYSFS
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 #define SLAB_SUPPORTS_SYSFS
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@@ -182,4 +175,25 @@
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 	return result;
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 }
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+/* Determine object index from a given position */
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+static inline unsigned int __obj_to_index(const struct kmem_cache *cache,
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+					  void *addr, void *obj)
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+{
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+	return reciprocal_divide(kasan_reset_tag(obj) - addr,
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+				 cache->reciprocal_size);
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+}
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+
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+static inline unsigned int obj_to_index(const struct kmem_cache *cache,
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+					const struct page *page, void *obj)
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+{
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+	if (is_kfence_address(obj))
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+		return 0;
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+	return __obj_to_index(cache, page_address(page), obj);
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+}
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+
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+static inline int objs_per_slab_page(const struct kmem_cache *cache,
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+				     const struct page *page)
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+{
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+	return page->objects;
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+}
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 #endif /* _LINUX_SLUB_DEF_H */