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Linux rogerthat 5.19.0-46-generic #47-Ubuntu SMP PREEMPT_DYNAMIC Fri Jun 16 13:30:11 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
第五章complete轻量级的一种同步机制
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h> /* current and everything */
#include <linux/kernel.h> /* printk() */
#include <linux/fs.h> /* everything... */
#include <linux/types.h> /* size_t */
#include <linux/completion.h>
MODULE_LICENSE("Dual BSD/GPL");
static int complet ...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/2024/05/01/LDD3-week2/" title="LDD3 学习笔记"><img class="post-bg" src="https://cdn.jsdelivr.net/gh/wr-web/picture/archive50.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="LDD3 学习笔记"></a></div><div class="recent-post-info"><a class="article-title" href="/2024/05/01/LDD3-week2/" title="LDD3 学习笔记">LDD3 学习笔记</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-05-01T04:00:00.000Z" title="发表于 2024-05-01 12:00:00">2024-05-01</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/Linux/">Linux</a></span></div><div class="content">LDD3 WEEK2第七章 时间、延时，和延后工作jiffies 回绕
定时器也是一种潜在的竞争条件的源
tasklet 大部分用于中断管理，也就是后文第十章的前和后半部。把一个中断处理分成两部分，也可以使用工作队列。
tasklet workqueue 区别：
tasklet 代码必须是原子的
tasklet 在同一 cpu 上运行
内核可以请求工作队列延后一个明确的间隔。
第八章 分配内存kmalloc
kmem_cache_create，Slab 缓存（内存排列密集，速度稍微提升）scullc
mempool_create 内存池
get_free_page（get_free_pages） 请求页 scullp
vmalloc，vmalloc 在分配几个页时比其他函数更快, 但是 当获取单个页时有些慢, 因为页表建立的开销 scullv
DEFINE_PER_CPU，per-cpu 每个都使用自己的拷贝
alloc_bootmem，启动时获得大量缓冲，绕开了所有内存管理
第九章 与硬件通信I/O 端口 request_region
端口分配（部分）
rt@roge ...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/2024/04/23/LDD3-week1/" title="LDD3 学习笔记"><img class="post-bg" src="https://cdn.jsdelivr.net/gh/wr-web/picture/archive49.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="LDD3 学习笔记"></a></div><div class="recent-post-info"><a class="article-title" href="/2024/04/23/LDD3-week1/" title="LDD3 学习笔记">LDD3 学习笔记</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-04-23T04:00:00.000Z" title="发表于 2024-04-23 12:00:00">2024-04-23</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/Linux/">Linux</a></span></div><div class="content">LDD3 WEEK1关于几种
一些 log level，感觉 ERR 还挺好用的
8 #define KERN_EMERG KERN_SOH "" /* system is unusable */
9 #define KERN_ALERT KERN_SOH "" /* action must be taken immediately */
10 #define KERN_CRIT KERN_SOH "" /* critical conditions */
11 #define KERN_ERR KERN_SOH "" /* error conditions */
12 #define KERN_WARNING KERN_SOH "" /* warning conditions */
13 #define KERN_NOTICE KERN_SOH "" /* normal but significant condition */
14 #define KERN_INFO KERN_SOH "" /* informational */
15 #define KERN_DE ...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/2024/04/17/LLD3-week0/" title="LDD3 学习笔记"><img class="post-bg" src="https://cdn.jsdelivr.net/gh/wr-web/picture/archive52.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="LDD3 学习笔记"></a></div><div class="recent-post-info"><a class="article-title" href="/2024/04/17/LLD3-week0/" title="LDD3 学习笔记">LDD3 学习笔记</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-04-17T04:00:00.000Z" title="发表于 2024-04-17 12:00:00">2024-04-17</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/Linux/">Linux</a></span></div><div class="content">LDD3 WEEK0这周忙于人工智能课程的作业，书本看的不多，下周多看一些多实践一些。
1.简介主要介绍了驱动程序的角色，内核划分，以及 Linux 版本号、社区的一些基本信息。
2.建立和运行模块hello worldobj-m += hello_world.o
all:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
clean:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
#include<linux/module.h>
#include<linux/kernel.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("RogerThat");
MODULE_DESCRIPTION("A simple hello world module");
MODULE_VERSION("0.01");
static int __init hello_mod_init(void)
{ ...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/2024/01/12/windows-terminal-customization/" title="Windows Terminal Customization"><img class="post-bg" src="https://cdn.jsdelivr.net/gh/wr-web/picture/archive40.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Windows Terminal Customization"></a></div><div class="recent-post-info"><a class="article-title" href="/2024/01/12/windows-terminal-customization/" title="Windows Terminal Customization">Windows Terminal Customization</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-01-12T04:00:00.000Z" title="发表于 2024-01-12 12:00:00">2024-01-12</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/Windows/">Windows</a></span></div><div class="content">Windows Terminal CustomizationThis article mainly solved the problem of “open windows terminal here”.
Firstly u need to download windows terminal in Microsoft Store，then u need to edit settings of windows terminal, add a customized shell like conda.
Run this registry file.
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\Directory\Background\shell\wt]
@="open terminal here"
[HKEY_CLASSES_ROOT\Directory\Background\shell\wt\command]
@="wt -d %V -p conda"
-d ...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/2023/11/26/MIT6.191/" title="MIT6.191"><img class="post-bg" src="https://cdn.jsdelivr.net/gh/wr-web/picture/archive33.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="MIT6.191"></a></div><div class="recent-post-info"><a class="article-title" href="/2023/11/26/MIT6.191/" title="MIT6.191">MIT6.191</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2023-11-26T04:00:00.000Z" title="发表于 2023-11-26 12:00:00">2023-11-26</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/Notes/">Notes</a><i class="fas fa-angle-right article-meta-link"></i><a class="article-meta__categories" href="/categories/Notes/AI/">AI</a></span></div><div class="content">SOME OF NOTES FROM THE LECTUREDeep Generative ModelingGenerative Modeling Goal: Take as input training samples from some distribution and learn a model that represents that distribution
latent variable: They are not directly observable, but they are the true underlying features or explanatory factors
Autoencoder: An autoencoder is a type of artificial neural network used to learn efficient codings of unlabeled data (unsupervised learning)
variational autoencoders(VAEs):
Generative Adversarial ...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/2023/11/20/%E8%8B%B1%E8%AF%AD%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0/" title="英语学习笔记"><img class="post-bg" src="https://cdn.jsdelivr.net/gh/wr-web/picture/archive17.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="英语学习笔记"></a></div><div class="recent-post-info"><a class="article-title" href="/2023/11/20/%E8%8B%B1%E8%AF%AD%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0/" title="英语学习笔记">英语学习笔记</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2023-11-20T04:00:00.000Z" title="发表于 2023-11-20 12:00:00">2023-11-20</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/Notes/">Notes</a></span></div><div class="content">
关于不记录点什么就什么也记不住这件事。
学习英语的困境阅读的速度比较慢，时常会在心里默读，但是主动看快点，又会导致囫囵吞枣。
口语发音不标准，听力容易理解出错。
目前的方法单词/句的积累（单纯的记忆，墨墨背单词，结合句子，部分结合词根）目前的进度是 100 w/m, 已经连续背了 25 天，但还是有一点慢。
关于口语/听力这回事音节（Syllable）每个音节都包含一个元音英标，辅音则是音节的分界线。
音节的划分可以用（-）或（·）来表示。
闭音节：以辅音结尾的音节。
开音节：以元音结尾的音节。
这俩后文也（自然拼读）中涉及到。
重音（Word Stress）重音符号（ˈ），次重音符号（ˌ）
自然拼读（Phonics）很多非常规的拼读，仍需积累。
单个辅音字母在单词中通常的读法（以英音为例）
辅音字母（组合）在单词中通常的读法（以英音为例）
单个元音字母在单词中的通常读法（以英音为例）
元音字母（组合）在单词中的通常读法（以英音为例）
节奏（Rhythm）英语不像中文的发音，中文每个字基本都是一个音节，每个音节等时，而英文一个单词可以有 ...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/2023/10/24/%E6%95%A3%E8%A8%98-10-24-23/" title="如何给 LLVM RISCV 添加一条“指令”（改进）"><img class="post-bg" src="https://cdn.jsdelivr.net/gh/wr-web/picture/archive16.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="如何给 LLVM RISCV 添加一条“指令”（改进）"></a></div><div class="recent-post-info"><a class="article-title" href="/2023/10/24/%E6%95%A3%E8%A8%98-10-24-23/" title="如何给 LLVM RISCV 添加一条“指令”（改进）">如何给 LLVM RISCV 添加一条“指令”（改进）</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2023-10-24T04:00:00.000Z" title="发表于 2023-10-24 12:00:00">2023-10-24</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/Notes/">Notes</a></span></div><div class="content">实验报告(改进)实验要求
完成指令编码设计（4分）
能够通过自己编写的至少2个正确汇编测试程序，生成正确的madd指令编码（4分）
能够通过自己编写的至少2个错误汇编测试程序，进行适当的错误处理（4分）
能够通过自己编写的至少1个C语言测试程序，生成正确的madd汇编指令（4分）
编码规范，风格良好，注释适当，架构合理（4分）
额外完成的
使用比较合适的测试方法
可以给 llvm 前端也添加相应的支持，支持高级语言的内联汇编或者内置函数生成对应的汇编
代码 Patch主模块rt@rogerthat ~/m/llvm-project-llvmorg-13.0.0 (master)> git format-patch 3c115231b000ed300a6f0551b5b30bd549d566f3
0001-Add-builtin-__builtin_riscv_madd.patch
0002-Edit-Emit-function-type-error-and-grammer-error.patch
0003-Repair-fix-int_ri ...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/2023/10/18/Dynamic%20Programming/" title="算法學習笔记"><img class="post-bg" src="https://cdn.jsdelivr.net/gh/wr-web/picture/archive24.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="算法學習笔记"></a></div><div class="recent-post-info"><a class="article-title" href="/2023/10/18/Dynamic%20Programming/" title="算法學習笔记">算法學習笔记</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2023-10-18T04:00:00.000Z" title="发表于 2023-10-18 12:00:00">2023-10-18</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/Notes/">Notes</a></span></div><div class="content">动态规划最长递增子序列问题（Longest Increasing Subsequence）
子序列 是由数组派生而来的序列，删除（或不删除）数组中的元素而不改变其余元素的顺序。例如，[3,6,2,7] 是数组 [0,3,1,6,2,2,7] 的子序列。
这是我写的代码（有点差劲的代码
class Solution {
public:
vector<int> dp;
int tryThrough(vector<int>& nums) {
int res = 0x80000000;
for (int i = 0; i < nums.size(); i++) {
if(dp[i] > res){
res = dp[i];
}
}
return res;
}
int lengthOfLIS(vector<int>&am ...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/2023/10/15/%E6%95%A3%E8%A8%98-10-14-23/" title="论文笔记:Tracer:Signature-based Static Analysis for Detecting Recurring Vulnerabilities"><img class="post-bg" src="https://cdn.jsdelivr.net/gh/wr-web/picture/archive15.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="论文笔记:Tracer:Signature-based Static Analysis for Detecting Recurring Vulnerabilities"></a></div><div class="recent-post-info"><a class="article-title" href="/2023/10/15/%E6%95%A3%E8%A8%98-10-14-23/" title="论文笔记:Tracer:Signature-based Static Analysis for Detecting Recurring Vulnerabilities">论文笔记:Tracer:Signature-based Static Analysis for Detecting Recurring Vulnerabilities</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2023-10-15T04:00:00.000Z" title="发表于 2023-10-15 12:00:00">2023-10-15</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/Notes/">Notes</a><i class="fas fa-angle-right article-meta-link"></i><a class="article-meta__categories" href="/categories/Notes/Paper/">Paper</a></span></div><div class="content">阅读论文：Tracer: Signature-based Static Analysis for Detecting Recurring Vulnerabilities
Intro由于开发者很容易在同样的地方踩坑（数学运算，协议等），或者人们对复杂的低级语意的误解（C 语言中的未定义行为等），加之代码重用，致使相似的漏洞重复出现。
代码相似性有一些相关论文，这里记录一下
Yaniv David et al. Firmup: Precise static detection of common vulnerabilities in firmware.
Steven H. et al. Asm2vec: Boosting static representation robustness for binary clone search against code obfuscation and compiler optimization
Jiyong Jang et al. Redebug: Finding unpatched code clones in entire os distrib ...</div></div></div><nav id="pagination"><div class="pagination"><span class="page-number current">1</span><a class="page-number" href="/page/2/#content-inner">2</a><span class="space">…</span><a class="page-number" href="/page/5/#content-inner">5</a><a class="extend next" rel="next" href="/page/2/#content-inner"><i class="fas fa-chevron-right fa-fw"></i></a></div></nav></div><div class="aside-content" id="aside-content"><div class="card-widget card-info"><div class="is-center"><div class="avatar-img"><img src="https://cdn.jsdelivr.net/gh/wr-web/picture/avatar.jpg" onerror="this.onerror=null;this.src='/img/friend_404.gif'" alt="avatar"/></div><div class="author-info__name">RT</div><div class="author-info__description">@Vidar-Team @CTFer @Game Lover </div></div><div class="card-info-data site-data is-center"><a href="/archives/"><div class="headline">文章</div><div class="length-num">42</div></a><a href="/tags/"><div class="headline">标签</div><div class="length-num">35</div></a><a href="/categories/"><div class="headline">分类</div><div class="length-num">17</div></a></div><a id="card-info-btn" target="_blank" rel="noopener" href="https://github.com/wr-web"><i class="fab fa-github"></i><span>Follow Me</span></a><div class="card-info-social-icons is-center"><a class="social-icon" href="https://github.com/wr-web" target="_blank" title="Github"><i class="fab fa-github" style="color: #24292e;"></i></a><a class="social-icon" href="mailto:[email protected]" target="_blank" title="Email"><i class="fas fa-envelope" style="color: #4a7dbe;"></i></a><a class="social-icon" href="https://wr-web.github.io/atom.xml" target="_blank" title="Rss"><i class="fas fa-rss" style="color: #2d69d7;"></i></a><a class="social-icon" href="https://space.bilibili.com/13582048" target="_blank" title="BiliBili"><i class="fab fa-bilibili" style="color: #00a1d6;"></i></a></div></div><div class="card-widget card-announcement"><div class="item-headline"><i class="fas fa-bullhorn fa-shake"></i><span>公告</span></div><div class="announcement_content">家人们加个友链</div></div><div class="sticky_layout"><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/2024/05/07/%E4%BB%A3%E7%A0%81%E8%A1%A5%E5%85%85/" title="LDD3 学习笔记"><img src="https://cdn.jsdelivr.net/gh/wr-web/picture/archive51.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="LDD3 学习笔记"/></a><div class="content"><a class="title" href="/2024/05/07/%E4%BB%A3%E7%A0%81%E8%A1%A5%E5%85%85/" title="LDD3 学习笔记">LDD3 学习笔记</a><time datetime="2024-05-07T04:00:00.000Z" title="发表于 2024-05-07 12:00:00">2024-05-07</time></div></div><div class="aside-list-item"><a class="thumbnail" href="/2024/05/01/LDD3-week2/" title="LDD3 学习笔记"><img src="https://cdn.jsdelivr.net/gh/wr-web/picture/archive50.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="LDD3 学习笔记"/></a><div class="content"><a class="title" href="/2024/05/01/LDD3-week2/" title="LDD3 学习笔记">LDD3 学习笔记</a><time datetime="2024-05-01T04:00:00.000Z" title="发表于 2024-05-01 12:00:00">2024-05-01</time></div></div><div class="aside-list-item"><a class="thumbnail" href="/2024/04/23/LDD3-week1/" title="LDD3 学习笔记"><img src="https://cdn.jsdelivr.net/gh/wr-web/picture/archive49.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="LDD3 学习笔记"/></a><div class="content"><a class="title" href="/2024/04/23/LDD3-week1/" title="LDD3 学习笔记">LDD3 学习笔记</a><time datetime="2024-04-23T04:00:00.000Z" title="发表于 2024-04-23 12:00:00">2024-04-23</time></div></div><div class="aside-list-item"><a class="thumbnail" href="/2024/04/17/LLD3-week0/" title="LDD3 学习笔记"><img src="https://cdn.jsdelivr.net/gh/wr-web/picture/archive52.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="LDD3 学习笔记"/></a><div class="content"><a class="title" href="/2024/04/17/LLD3-week0/" title="LDD3 学习笔记">LDD3 学习笔记</a><time datetime="2024-04-17T04:00:00.000Z" title="发表于 2024-04-17 12:00:00">2024-04-17</time></div></div><div class="aside-list-item"><a class="thumbnail" href="/2024/01/12/windows-terminal-customization/" title="Windows Terminal Customization"><img src="https://cdn.jsdelivr.net/gh/wr-web/picture/archive40.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Windows Terminal Customization"/></a><div class="content"><a class="title" href="/2024/01/12/windows-terminal-customization/" title="Windows Terminal Customization">Windows Terminal Customization</a><time datetime="2024-01-12T04:00:00.000Z" title="发表于 2024-01-12 12:00:00">2024-01-12</time></div></div></div></div><div class="card-widget card-categories"><div class="item-headline">
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