A patch is file used to alter a source code package, e.g. in order to correct a bug or add a feature.

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Implementing patch for changing a CPU frequency governor [closed]

I am a beginner in Linux. I want implement patch for changing a CPU frequency governor.But I don't know what is patch and Governor in Linux and I don't know where I can start from? Please help me with ...
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When patching what's the difference between arguments -p0 and -p1?

What's the difference between patch -p0 and patch -p1? Is there any difference at all?
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What is the difference between a patch which reverts a commit and a “reversed patch”?

Before May 6th, 2013, the fs/eventpoll.c file in the Linux kernel had the following line #1605: if (!schedule_hrtimeout_range(to, slack, HRTIMER_MODE_ABS)) On May 6th, a commit changes this to ...
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How do I apply this revert commit patch from git?

I have found a patch applicable to my system to fix a problem but I have no idea how to get this patch and then apply it. Can anybody help me please? Patch: ...