给内核打补丁patch命令问题？

roofers

如果要给内核打补丁的话，首先要下载内核及其补丁文件，然后用patch给内核打补丁，但是有个问题搞不懂，patch后面接的参数p0、p1、p2是什么意思？还有我用这个命令给系统打补丁的时候提示很多要按‘y’或者‘n’的东东出来，本人英文水平有限看不懂啥意思！！？
就像下面这样

1. 
   
2. dwj@beyond:/tmp$ patch -p0 < /home/dwj/Downloads/patch-2.6.26.3
   
3. The next patch would delete the file a/Documentation/ftrace.txt,
   
4. which does not exist!  Assume -R? [n]
   
5. Apply anyway? [n]
   
6. Skipping patch.
   
7. 1 out of 1 hunk ignored
   
8. can't find file to patch at input line 1364
   
9. Perhaps you used the wrong -p or --strip option?
   
10. The text leading up to this was:
    
11. --------------------------
    
12. |diff --git a/Documentation/networking/udplite.txt b/Documentation/networking/udplite.txt
    
13. |index 3870f28..855d8da 100644
    
14. |--- a/Documentation/networking/udplite.txt
    
15. |+++ b/Documentation/networking/udplite.txt
    
16. --------------------------
    
17. File to patch:
    

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