Linux kernel debug

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How to debug from kernel message
for example:
文件:范例.jpg
1. find the address of function 

cd KIRNEL_DIR
cat System.map |grep "function name"

2. calculate pc absolute address, in my case: 

  ffff800010b7a2a0 + 0x210 = ffff800010b7a4b0

3. find the line of source code 

aarch64-linux-gnu-addr2line  -e vmlinux <absolute address>
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