custom kernel, how to revert patch

[Chris Murphy]

I'm trying to track down a btrfs regression and need to revert a ~10 month old patch using 3.12.0-rc4 as the basis.

This http://fedoraproject.org/wiki/Building_a_custom_kernel has ApplyPatch examples in the spec file, which works fine. Is there an inverse command? Or do I need to do it manually with patch -p0 -R < ?

Chris Murphy
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