On Sat, Aug 04, 2018 at 09:42:05PM +0300, Kirill Tkhai wrote: > This is exactly the thing the patch makes. Instead of inserting a shrinker pointer > to idr, it inserts a fake value SHRINKER_REGISTERING there. The patch makes impossible > to dereference a shrinker unless it's completely registered. - id = idr_alloc(&shrinker_idr, shrinker, 0, 0, GFP_KERNEL); + id = idr_alloc(&shrinker_idr, SHRINKER_REGISTERING, 0, 0, GFP_KERNEL); Instead: + id = idr_alloc(&shrinker_idr, NULL, 0, 0, GFP_KERNEL); ... and the rest of your patch becomes even simpler.
