kernel patch
 

i downloaded kernel2.4.21 patch.i have not compiled any kernel patches yet but compiled complete kernel.so iam a kinda newbie to kernel patch.i have copied patch-2.4.21.bz2 to current kernel source directory(kenel 2.4.20-8).then i ran "bzip2 -dc patch-2.4.21.bz2 | patch -p0" but it says
"can't find file to patch at input line 4
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
--------------------------
|diff -urN linux-2.4.20/CREDITS linux-2.4.21/CREDITS
|--- linux-2.4.20/CREDITS 2002-11-28 15:53:08.000000000 -0800
|+++ linux-2.4.21/CREDITS 2003-06-13 07:51:29.000000000 -0700
--------------------------
File to patch:"
what is that i have to do later or what's the file name should i give?i need the exact solution plz help me.thanks.....

Try this command, you might have more luck:

bzip2 -dc patch-2.4.21.bz2 | patch -Np1