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linux为什么打补丁回有时部分不成功



我的linux版本为linux-3.2.0,现在我想把版本升级到linux-3.2.21,于是下载了一个patch-3.2.21的内核补丁,但是当我在linux目录下打补丁(sudo patch -p1 < ../patch-3.2.21)后总是发现补丁总有部分代码无法争取写入到内核源码里面,请问这是什么原因?