mm: kmem: make mem_cgroup_from_obj() vmalloc()-safe

Currently mem_cgroup_from_obj() is not working properly with objects
allocated using vmalloc().  It creates problems in some cases, when it's
called for static objects belonging to modules or generally allocated
using vmalloc().

This patch makes mem_cgroup_from_obj() safe to be called on objects
allocated using vmalloc().

It also introduces mem_cgroup_from_slab_obj(), which is a faster version
to use in places when we know the object is either a slab object or a
generic slab page (e.g.  when adding an object to a lru list).

Link: https://lkml.kernel.org/r/[email protected]
Suggested-by: Kefeng Wang <[email protected]>
Signed-off-by: Roman Gushchin <[email protected]>
Tested-by: Linux Kernel Functional Testing <[email protected]>
Acked-by: Shakeel Butt <[email protected]>
Tested-by: Vasily Averin <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Acked-by: Muchun Song <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Naresh Kamboju <[email protected]>
Cc: Qian Cai <[email protected]>
Cc: Kefeng Wang <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: Florian Westphal <[email protected]>
Cc: Jakub Kicinski <[email protected]>
Cc: Michal Koutný <[email protected]>
Cc: Paolo Abeni <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions