virt_to_obj takes kmem_cache address, address of slab page, address x pointing somewhere inside slab object, and returns address of the beginning of object.
Signed-off-by: Andrey Ryabinin <[email protected]> Acked-by: Christoph Lameter <[email protected]> --- include/linux/slub_def.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h index 9abf04e..db7d5de 100644 --- a/include/linux/slub_def.h +++ b/include/linux/slub_def.h @@ -110,4 +110,20 @@ static inline void sysfs_slab_remove(struct kmem_cache *s) } #endif + +/** + * virt_to_obj - returns address of the beginning of object. + * @s: object's kmem_cache + * @slab_page: address of slab page + * @x: address within object memory range + * + * Returns address of the beginning of object + */ +static inline void *virt_to_obj(struct kmem_cache *s, + const void *slab_page, + const void *x) +{ + return (void *)x - ((x - slab_page) % s->size); +} + #endif /* _LINUX_SLUB_DEF_H */ -- 2.2.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
