[7.0][mm] anolis: kfence: Handle freeing kfence pages properly · Pull Request !6897 · anolis/cloud-kernel

bugzilla: https://bugzilla.openanolis.cn/show_bug.cgi?id=34473

1. anolis: kfence: Handle freeing kfence pages properly
2. anolis: kfence: Record original gfp when alloc orfer-0 page
3. anolis: kfence: fix race with get_page_unless_zero()
4. anolis: kfence: Fix a race condition about slab_want_init_on_free()
5. anolis: kfence: Recover PUD page table correctly

pass kfence kunit test
[  179.244762] # kfence: pass:29 fail:0 skip:4 total:33
[  179.244775] # Totals: pass:29 fail:0 skip:4 total:33
[  179.244777] ok 1 kfence

未合入的kfence增强相关补丁：
1. b1256a54f6d2 kidled: do not monitor kfence memory —— 因为 kidled 还未合入 7.0

2. 77c57ba548f1 kfence: save freeing stack trace at calling time instead of freeing time —— 已存在

3. e46ab19a05a5 arm64: kfence: split dynamic allocation into PTE level —— 7.0 arm64 已原生具备 range_split_to_ptes() 基础设施，且 arch/arm64/mm/pageattr.c 已经过重构，不再需要 6.6 中手动实现的 split_linear_mapping_after_init() 逻辑。

4. 51acc778c7f2 kfence: fix memcg related issue —— 已单独处理 memcg 相关清理逻辑

5. c6f5a51ecb7d kfence: fix NULL deref in get_free_meta —— 已单独处理

类型	指派人员	状态
审查	xunlei 半叶枫尘 zhongjiang Artie Ding winterddd xueshuai vxuyu dtc maqiao-alibaba baolin.wang Tony Lu 冯光辉 Guixin Liu kun-llfl Xuchun Shang XiangZao fangyu0809	已完成 (0/0人)
测试	小龙已测试通过	已完成 (1/1人)

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