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标题: 如何一键优雅的更新内核patch [打印本页]

作者: 润开鸿_闻飞 时间: 2024-5-17 14:11
标题: 如何一键优雅的更新内核patch
[md][itopen组织](https://gitee.com/itopen)
1、提供OpenHarmony优雅实用的小工具
2、手把手适配riscv + qemu + linux的三方库移植
3、未来计划riscv + qemu + ohos的三方库移植 + 小程序开发
4、一切拥抱开源，拥抱国产化

## 一、进入内核，修改内核代码

```shell
cd kernel/linux/linux-5.10
vim drivers/Kconfig
# 在倒数第二行加入：source "drivers/tracepoint/Kconfig"

source "drivers/most/Kconfig"

source "drivers/accesstokenid/Kconfig"

source "drivers/tracepoint/Kconfig"
endmenu
```

## 二、打patch

```shell
patch -p1 < ../patches/linux-5.10/rk3568_patch/kernel.patch
```

如果想撤回patch方法

```shell
patch -Rp1 < ../patches/linux-5.10/rk3568_patch/kernel.patch
```

## 三、解决冲突（如果存在）

```shell
$ git status | grep rej
Refresh index: 100% (70816/70816), done.
      drivers/Kconfig.rej
```

上面表示drivers/Kconfig文件的打patch时候有冲突被拒绝了，需要手动进行修改

- **打开drivers/Kconfig.rej文件**

  ```shell
  --- drivers/Kconfig
  +++ drivers/Kconfig
  @@ -239,4 +239,8 @@ source "drivers/counter/Kconfig"
source "drivers/most/Kconfig"

source "drivers/accesstokenid/Kconfig"
  +
  +source "drivers/rkflash/Kconfig"
  +
  +source "drivers/rk_nand/Kconfig"
endmenu
  ```

  这个文件的意思是需要在source "drivers/accesstokenid/Kconfig"的下面添加四行内容
- **打开drivers/Kconfig文件，手动解决patch添加**

  ```shell
  # 修改前
  source "drivers/most/Kconfig"

  source "drivers/accesstokenid/Kconfig"

  source "drivers/tracepoint/Kconfig"
  endmenu

  # 修改后
  source "drivers/most/Kconfig"

  source "drivers/accesstokenid/Kconfig"

  source "drivers/tracepoint/Kconfig"

  source "drivers/rkflash/Kconfig"

  source "drivers/rk_nand/Kconfig"
  endmenu
  ```
- **删除冲突生成的临时orig和rej文件**

  ```shell
  rm -rf drivers/Kconfig.orig drivers/Kconfig.rej
  ```
- **至此冲突解决完**

## 四、生成新的patch

[git生成patch和打patch](https://blog.csdn.net/u013318019/article/details/114860407)

```shell
git add .
git commit . -m"add tracepoint"
# 如果只有一次提交使用format-patch方便
git format-patch HEAD^
# 如果想打commit1和commit2之间的patch
# 其中commit1是起始的commit; commit2是结束的commit
git diff commit1 commit2 > demo.patch
```

此时会生成一个patch文件0001-add-tracepoint.patch

## 五、原patch修改

```
我们比对0001-add-tracepoint.patch 和 ../patches/linux-5.10/rk3568_patch/kernel.patch文件发现差异特别大，那是因为每次生成的patch时候对应的文件顺序是不一样的，所以差异比较大，我们要做的是将我们修改的文件patch内容替换即可。
```

```shell
# 比较文件的方法
diff 0001-add-tracepoint.patch ../patches/linux-5.10/rk3568_patch/kernel.patch
```

打开0001-add-tracepoint.patch文件搜索drivers/Kconfig，将如下内容替换掉../patches/linux-5.10/rk3568_patch/kernel.patch中的相同位置内容，至此，patch修改完成

```shell
# 0001-add-tracepoint.patch中的内容
diff --git a/drivers/Kconfig b/drivers/Kconfig
index 826b2b19d..5720a24fb 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -239,4 +239,10 @@ source "drivers/counter/Kconfig"
source "drivers/most/Kconfig"

source "drivers/accesstokenid/Kconfig"
+
+source "drivers/tracepoint/Kconfig"
+
+source "drivers/rkflash/Kconfig"
+
+source "drivers/rk_nand/Kconfig"
endmenu

# 原../patches/linux-5.10/rk3568_patch/kernel.patch中的内容
diff --git a/drivers/Kconfig b/drivers/Kconfig
index 826b2b19d..d7f2fc98b 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -239,4 +239,8 @@ source "drivers/counter/Kconfig"
source "drivers/most/Kconfig"

source "drivers/accesstokenid/Kconfig"
+
+source "drivers/rkflash/Kconfig"
+
+source "drivers/rk_nand/Kconfig"
endmenu

# 替换后../patches/linux-5.10/rk3568_patch/kernel.patch中的内容
diff --git a/drivers/Kconfig b/drivers/Kconfig
index 826b2b19d..5720a24fb 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -239,4 +239,10 @@ source "drivers/counter/Kconfig"
source "drivers/most/Kconfig"

source "drivers/accesstokenid/Kconfig"
+
+source "drivers/tracepoint/Kconfig"
+
+source "drivers/rkflash/Kconfig"
+
+source "drivers/rk_nand/Kconfig"
endmenu

```

## 六、内核版本回退

```shell
rm 0001-add-tracepoint.patch
git reset --hard HEAD^
```

## 七、至此kernel.patch修改完成
[/md]

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