Compiling UM fails for 32 bit kernel, but works for 64 bit kernel

gregorian · 02-09-2014, 02:29 PM

I'm trying to compile the UM kernel on my Ubuntu system. I'm running on 64 bit Ubuntu 13.10, and I've unselected 64 bit kernel and in the menuconfig of the kernel.

My system.

Code:

 
Linux cc 3.11.0-15-generic #25-Ubuntu SMP Thu Jan 30 17:22:01 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
model name	: Intel(R) Core(TM) i5-3230M CPU @ 2.60GHz

In the kernel configuration, since the default didn't work, I had chosen Core 2/newer Xeon.

Compilation fails:

Code:

  CC      arch/x86/um/user-offsets.s
arch/x86/um/user-offsets.c:1:0: error: CPU you selected does not support x86-64 instruction set
 #include <stdio.h>
 ^
make[1]: *** [arch/x86/um/user-offsets.s] Error 1
make: *** [arch/x86/um/user-offsets.s] Error 2

Compiling 64 bit kernel works fine.

ianbb01 · 02-10-2014, 01:14 AM

Quote:

Originally Posted by gregorian

I'm trying to compile the UM kernel on my Ubuntu system. I'm running on 64 bit Ubuntu 13.10, and I've unselected 64 bit kernel and enabled ext2 file system in the menuconfig of the kernel.

My system.

Code:

uname -a 
Linux cc 3.11.0-15-generic #25-Ubuntu SMP Thu Jan 30 17:22:01 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

Compilation fails:

Code:

  CC      arch/x86/um/user-offsets.s
arch/x86/um/user-offsets.c:1:0: error: CPU you selected does not support x86-64 instruction set
 #include <stdio.h>
 ^
make[1]: *** [arch/x86/um/user-offsets.s] Error 1
make: *** [arch/x86/um/user-offsets.s] Error 2

Compiling 64 bit kernel works fine.

According to the error you still have x64 configs. You need to make sure that your configuration is valid for x86 build.

gregorian · 02-10-2014, 10:32 AM

Quote:

Originally Posted by ianbb01

According to the error you still have x64 configs. You need to make sure that your configuration is valid for x86 build.

I have been successfully able to compile this with the same configuration on other computers. It's just my computer that is failing, and I want to know why.