Messages in this thread Patch in this message | | | From | Andrey Ryabinin <> | Subject | [PATCH v11 06/19] mm: slub: introduce virt_to_obj function. | Date | Tue, 03 Feb 2015 20:42:59 +0300 |
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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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