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    Subject[RFC/PATCH v2 04/10] 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 begging of object.

    Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com>
    ---
    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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