User Mode Linux
 

Hello all,

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I was trying to compile a UML kernel version 2.6.13-4.

I updated the .config file using
make xconfig ARCH=um
and then I typed
make ARCH=um

The output of the same is given below.


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LD init/built-in.o

LD .tmp_vmlinux1

arch/um/sys-i386/built-in.o: In function `__crc_kunmap':
: multiple definition of `__crc_kunmap'

arch/um/sys-i386/built-in.o: In function `__crc_kmap_atomic':
: multiple definition of `__crc_kmap_atomic'

arch/um/sys-i386/built-in.o: In function `__crc_kmap_atomic_to_page':
: multiple definition of `__crc_kmap_atomic_to_page'

arch/um/sys-i386/built-in.o: In function `__crc_kmap':
: multiple definition of `__crc_kmap'

collect2: ld returned 1 exit status

KSYM .tmp_kallsyms1.S

nm: '.tmp_vmlinux1': No such file

No valid symbol.
make: ***
[.tmp_kallsyms1.S]
Error 1
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Can you please explain whats wrong and how should i proceed with building my UML kernel?

Thank you

You "updated" the config? You mean you compiled a native kernel, then reconfigured for uml?

If so, that might be the problem. Do a make mrproper and configure from scratch. Re-making for a differenct arch can leave old files lying around, which is probably why it's screwed up.

One thing to note is that with 2.6 you can now configure and build in a different dir. This is handy as it keeps the src dir clean. You need a clean src so do a make mrproper first. Then, e.g. 'make O=../build-um ARCH=um xconfig' etc.
Of course, you must specify the O=../whatever for each invocation of make. You can then build as many kernels as you like, building each in a different dir. (Note that you still need to run make from the kernel dir, not the dir you specify with O=).