[RFC/PATCH v2 04/10] 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>
---
 mm/slab.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mm/slab.h b/mm/slab.h
index 026e7c3..3e3a6ae 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -346,4 +346,10 @@ static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node)
 void *slab_next(struct seq_file *m, void *p, loff_t *pos);
 void slab_stop(struct seq_file *m, void *p);
 
+static inline void *virt_to_obj(struct kmem_cache *s, void *slab_page, void *x)
+{
+	return x - ((x - slab_page) % s->size);
+}
+
+
 #endif /* MM_SLAB_H */
-- 
1.8.5.5

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