everyone says linux kernal is open to all..but where is that?
hw can i modify d kernel of fedora3 which is installed on my system...and even after modification hw is that saved?

the kernel must be in /usr/src. named linux or there can be a symbolic link named something like linux-2.2.16. you can simply call make after modifying the kernel and adding patches.

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If you and me have one apple each and we exchange we both have one apple each.
But if you and me have one idea each and we exchange we both have two ideas each

Fedora doesn't include the Linux Kernel sources to the offitial distribution. You should manually to download and install the next rpm package: http://download.fedora.redhat.com/pu...-1.667.src.rpm
After that, You will have the kernell sources in /usr/src/kernel directory.

How to build custom kernel You can refer to HOWTO's or to the LAME (http://www.tldp.org/LDP/lame/LAME/li...el-custom.html).

Have fun :)

You can type
# make menuconfig
to get a n-curses based menu from where you can modify the kernel by selecting and/or modifying features.
then build the kernel and the modules.
# make && make modules_install
Then copy the kernel image
mount the boot partition if you have to.
# mount /boot
and then,
# cp arch/i386/boot/bzImage /boot/kernel
substitute i386 with ur architecture.

Keep your face towards the sun, you'll never face the shadow.