linux-kernel - How to quick test/debug in linux kernel?

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Message-ID: <MvEVlTCbeP8Fr6I7mi3pGDQuv7_Yc7CB2OITb8_7IOgJvxmHxXKeIv8XTzTBfazMnyWs6SlMqcM4hAd_TKiRKL9TXppOEFEzbtrZ93Y9Jqc=@proton.me>
Date: Fri, 16 Aug 2024 11:05:31 +0000
From: jwbda <jwbda@...ton.me>
To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: How to quick test/debug in linux kernel?

Hi guys, would you mind help me with this:
How to quick test/debug in linux kernel?

Here is my method: 
Make some changes to the source code, add this line of code `printk(KERN_INFO ">>> run in kernel!\n");`

Then compile and run

```sh
make -j12
sudo qemu-system-x86_64 -hda ./mybuild/mylinux.img -m 4096 --enable-kvm -kernel ./linux/arch/x86_64/boot/bzImage -append "root=/dev/sda rw console=ttyS0" -nographic
```
Then check the results in the console. But I think this method is still a bit cumbersome. May I ask how do you quickly test/debug in linux kernel?