Ciao quando arrivo all'applicazione della patch mi esce questo

codice:
bastard@bastard-desktop:/usr/src/linux-2.6.21$ cat ../patch-2.6.21-rt5 | patch -p1
patching file Documentation/kernel-parameters.txt
patching file Documentation/stable_api_nonsense.txt
patching file Makefile
patching file arch/arm/Kconfig
can't find file to patch at input line 174
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
--------------------------
|Index: linux/arch/arm/boot/compressed/head.S
|===================================================================
|--- linux.orig/arch/arm/boot/compressed/head.S
|+++ linux/arch/arm/boot/compressed/head.S
--------------------------
File to patch:
L'errore mi sembra su Kconfig come risolvo??

P.S la guida che stò seguendo è questa http://divilinux.wordpress.com/tag/kernel/

Ciao e buona domenica