On 2/9/21 6:46 PM, Yang Shi wrote:

Currently registered shrinker is indicated by non-NULL shrinker->nr_deferred.
This approach is fine with nr_deferred at the shrinker level, but the following
patches will move MEMCG_AWARE shrinkers' nr_deferred to memcg level, so their
shrinker->nr_deferred would always be NULL.  This would prevent the shrinkers
from unregistering correctly.

Remove SHRINKER_REGISTERING since we could check if shrinker is registered
successfully by the new flag.

Acked-by: Kirill Tkhai <redacted>
Signed-off-by: Yang Shi <redacted>

Acked-by: Vlastimil Babka <redacted>

With Roman's suggestion it's fine by me too.