linux patch files

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http://www.unix.com – can you anyone tell what the linux patch is? I want to install a real time kernel, so to compile the kernel first I need to add the downloaded real time patch to it : patch -p1 < patch-rt-version but what about the kernel's own patch? as I've seen when I download the kernel from kernel.org, the kernels patches are also in the same kernel folder. (HowTos)