Hi,
I am trying to compile a module on UML. The kernel with which I am
booting UML is my custom kernel built on i386 machine with the command
line as "make defconfig ARCH=um; make linux ARCH=um". After the kernel
boots up my uname shows something like below :-
bash-3.2# uname -a
Linux localhost.localdomain 2.6.30.4 #6 Wed Aug 5 15:12:08 IST 2009
i686 i686 i386 GNU/Linux
Now when I compile a module, by default it resolves the ARCH to x86.
And some of the compilation fails because somethings are expected to
be always defined on x86 but not on UML (e.g.
CONFIG_TRACE_IRQFLAGS_SUPPORT). because my asm directory resolves to
asm-um rather than asm-x86. It throws error like below.
In file included from include/linux/prefetch.h:14,
from include/linux/list.h:6,
from include/linux/wait.h:22,
from include/linux/fs.h:359,
from include/linux/buffer_head.h:11,
from /home/mkatiyar/personal/ohsm/test/kernel/admin.c:23:
/mnt/host/home/mkatiyar/personal/uml/linux-2.6.30.4/arch/x86/include/asm/processor.h:
In function 'load_cr3':
/mnt/host/home/mkatiyar/personal/uml/linux-2.6.30.4/arch/x86/include/asm/processor.h:191:
error: 'CONFIG_PAGE_OFFSETUL' undeclared (first use in this function)
/mnt/host/home/mkatiyar/personal/uml/linux-2.6.30.4/arch/x86/include/asm/processor.h:191:
error: (Each undeclared identifier is reported only once
/mnt/host/home/mkatiyar/personal/uml/linux-2.6.30.4/arch/x86/include/asm/processor.h:191:
error: for each function it appears in.)
/mnt/host/home/mkatiyar/personal/uml/linux-2.6.30.4/arch/x86/include/asm/processor.h:
In function 'wbinvd_halt':
/mnt/host/home/mkatiyar/personal/uml/linux-2.6.30.4/arch/x86/include/asm/processor.h:771:
error: implicit declaration of function 'halt'
My question is how do people build modules which are specific to a
particular architecture on UML ? Is it possible ?
Once I export ARCH=um before doing a make, I can do a successful build.
--
Thanks -
Manish
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