[PATCH v4 06/13] mm: slub: introduce virt_to_obj function.

[Andrey Ryabinin]

virt_to_obj takes kmem_cache address, address of slab page,
address x pointing somewhere inside slab object,
and returns address of the begging of object.

Signed-off-by: Andrey Ryabinin <a.ryabinin@xxxxxxxxxxx>
---
 include/linux/slub_def.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index d82abd4..c75bc1d 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -110,4 +110,9 @@ static inline void sysfs_slab_remove(struct kmem_cache *s)
 }
 #endif
 
+static inline void *virt_to_obj(struct kmem_cache *s, void *slab_page, void *x)
+{
+	return x - ((x - slab_page) % s->size);
+}
+
 #endif /* _LINUX_SLUB_DEF_H */
-- 
2.1.2

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