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    Subject[PATCH v11 06/19] mm: slub: introduce virt_to_obj function.
    Date
    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 <a.ryabinin@samsung.com>
    Acked-by: Christoph Lameter <cl@linux.com>
    ---
    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


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