type-based slab allocation: kmalloc_obj family

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" summary

Proposal changes slab allocator to be type-aware by introducing kmalloc_obj() v4/v5 so allocations return typed pointers instead of void, and it converts the ~20,000 kmalloc callsites while uncovering about six real type mismatches. It implements automatic flexible-array counter assignment (signed counters map negative to zero for safety), simplifies macros from large complex expansions to two-line forms, covers kmalloc/kv wrappers now and leaves devm_kmalloc as an extension to implement.

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" chapters (9)

1. 0:00Introduction and motivation
2. 1:26Type safety benefits
3. 3:13Flexible array counters
4. 6:03Signed counters and security
5. 7:48Simplified macros and cleanup
6. 9:33Page allocator vs slab allocator
7. 10:59Encouraging typed allocations
8. 12:46Callbacks and void pointers
9. 14:14Q&A and wrap-up