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I am working on a project that requires me to install a Real Time Preempt kernel. I have found a tutorial and Linus Torvalds' readme (Creator of Linux kernel) that both explain that to install a vanilla kernel tree start with the following:

xz -cd linux-4.4.86.tar.xz | tar xvf -
cd linux-4.4.86

Then they each differ in what patch to add. The tutorial says I should download and apply:

Patch 2

xzcat ../patch-4.4.86-rt99.patch.xz | patch -p1

While Linus Torvald's repo says to execute:

Patch 2

xz -cd ../patch-4.4.86.xz | patch -p1

I know the first patch is required for my kernel to run in realtime, but is there a problem with me applying the second patch?

When I apply the second patch I get the following error message (which tells me I probably shouldn't be applying two patches):

xzcat ../patch-4.4.86.xz | patch -p1
patching file Documentation/arm64/silicon-errata.txt
Reversed (or previously applied) patch detected!  Assume -R? [n]

From what I've read, a patch just reads the differences between two files and corrects them, so would applying the second patch patch-4.9.47 remove the patch for RT or concatenate it? Any insight as to which step to take would be very helpful.

  • Not vested in this but I think the more recent will remove the older one. I thin that's how patches aught to work. – George Udosen Sep 13 '17 at 15:42
  • But doesn't each patch add some features, why would they be mutually exclusive? – Max Sep 14 '17 at 13:00
  • Yes they do what I meant was modify the older one not remove, sorry for using remove. – George Udosen Sep 14 '17 at 14:58
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As it turns out, I only needed to apply the one patch. It is certainly possible to apply more than 1 path but this may cause compatibility issues.

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