> Try cleaning the tree with mrproper (save your
> .config first) and using
> make linux ARCH=um
> (and make modules ARCH=um if you use modules)
> for the build.

I have cleaned tree using make mrproper ARCH=um
command.
And after that i created .config file by using make
xconfig ARCH=um command.

Some sites suggested to modify Makefile before
building UML, so I did that. 
I have commneted out in my makefile
#ifndef CONFIG_FRAME_POINTER
#CFLAGS += -fomit-frame-pointer
#endif

And removed -O2 option from following 
HOSTCFLAGS = -Wall -Wstrict-prototypes -O2
-fomit-frame-pointer
HOSTCXXFLAGS = -O2

> However, using such a old UML kernel is really not
> recommended, you can upgrade the UML kernel without 
  > upgrading the host kernel.

Is it possible to have UML kernel [ guest kernel ] of
higher version than the host kernel. In my case, as
suggested by you, I am planning to have kernel 2.6.10
[ which has UML build in it] as guest kernel and host
kernel as 2.4.20. As 2.6.10 already had UML built-in,
this will keep me away from patch work.

Please tell me whether the steps to build UML kernel
from an unpatched kernel are same or any difference.

Thanks & Regards
Dinesh





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