On 05.08.2018 03:03, Matthew Wilcox wrote: > 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. The patch, we are discussing at the moment, does *exactly* this: https://lkml.org/lkml/2018/8/3/588 It looks like you missed this hunk in the patch.
