memcg, kmem: further deprecate kmem.limit_in_bytes
The deprecation process of kmem.limit_in_bytes started with the commit 0158115f ("memcg, kmem: deprecate kmem.limit_in_bytes") which also explains in detail the motivation behind the deprecation. To summarize, it is the unexpected behavior on hitting the kmem limit. This patch moves the deprecation process to the next stage by disallowing to set the kmem limit. In future we might just remove the kmem.limit_in_bytes file completely. [akpm@linux-foundation.org: s/ENOTSUPP/EOPNOTSUPP/] [arnd@arndb.de: mark cancel_charge() inline] Link: https://lkml.kernel.org/r/20211022070542.679839-1-arnd@kernel.org Link: https://lkml.kernel.org/r/20211019153408.2916808-1-shakeelb@google.comSigned-off-by: Shakeel Butt <shakeelb@google.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Roman Gushchin <guro@fb.com> Acked-by: Michal Hocko <mhocko@suse.com> Reviewed-by: Muchun Song <songmuchun@bytedance.com> Cc: Vasily Averin <vvs@virtuozzo.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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