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>
Acked-by: Christoph Lameter <cl@xxxxxxxxx>
---
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 9abf04e..eca3883 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 */
--
2.2.2
--
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