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SubjectRe: [PATCH] mm: Use special value SHRINKER_REGISTERING instead list_empty() check
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.

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