diff --git a/study/kernel/00-DESCRIPTION/DEBUGGING.md b/study/kernel/00-DESCRIPTION/DEBUGGING.md
index 8499986..073e64f 100644
--- a/study/kernel/00-DESCRIPTION/DEBUGGING.md
+++ b/study/kernel/00-DESCRIPTION/DEBUGGING.md
@@ -260,6 +260,7 @@ Facebook 在 2018 年开源了一套解决重要计算集群管理问题的 Linu
 | 2021/02/14 | Tobin C. Harding <me@tobin.cc> | [add support for never printing hashed addresses](https://lore.kernel.org/patchwork/cover/1380477) | 新引入 no_hash_pointers 启动参数, 可以禁用 %p 只打印散列值不打印实际地址的限制, 让 %p 可以重新打印内核实际地址. | v4 ☑ 5.12-rc1 | [PatchWork 0/3,v4](https://lore.kernel.org/patchwork/cover/1380477)<br>*-*-*-*-*-*-*-* <br>[关键 commit 57e734423add](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5ead723a20e0447bc7db33dc3070b420e5f80aa6) |
 | 2018/11/24 | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | [printk: Add caller information to printk() output.](https://lore.kernel.org/lkml/1543045075-3008-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp) | NA | v1 ☑ 5.1-rc1 | [PatchWork 0/3,v4](https://lore.kernel.org/lkml/1543045075-3008-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp)<br>*-*-*-*-*-*-*-* <br>[关键 commit 15ff2069cb7f](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=15ff2069cb7f967dae6a8f8c176ba51447c75f00) |
 | 2021/10/12 | "Matthew Wilcox (Oracle)" <willy@infradead.org> | [Improvements to %pGp](https://patchwork.kernel.org/project/linux-mm/patch/20211012182647.1605095-6-willy@infradead.org) | `%pGp` 用来打印 page flag 的信息(通过 format_page_flags() 打印 `__def_pageflag_name`), 但是之前打印的方式比较麻烦, 需要使用 `%#lx(%pGp)`, 先用 hex 16 进制打印一次, 再用 `%pGp` 打印一次, 使用起来略显麻烦. 因此修改 `%pGp` 在打印 flag 的同时, 同时用 hex 打印一次. 这样单用 `%pGp` 就可以完成输出. | v1 ☐ | [PatchWork](https://patchwork.kernel.org/project/linux-mm/patch/20211012182647.1605095-6-willy@infradead.org) |
+| 2017/11/08 | Linus Torvalds <torvalds@linux-foundation.org> | [stop using '%pK' for /proc/kallsyms pointer values](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c0f3ea1589394deac2d840c685f57c69e4ac4243) | commit [c0f3ea158939 stop using '%pK' for /proc/kallsyms pointer values](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c0f3ea1589394deac2d840c685f57c69e4ac4243) 4.15 之后, kallsyms 不用 %pK 打印了. 但是仍然用 kptr_restrict 控制权限. | v1 ☑ 5.1-rc1 | [ommit c0f3ea158939](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c0f3ea1589394deac2d840c685f57c69e4ac4243) |
 
 
 # 10 KEXEC