[Xen-devel] mach_mpspec.h, mach_apicdef.h & xenbus_mkdir

["J. Aaron Pendergrass" <James.Pendergrass@xxxxxxxxxx>]

Hello list,
I'm trying to build a linux kernel module that uses xenstore to report
on the modules loaded into a DomU's kernel.  When building against
the current unstable (changeset 15080:089696e0c603) I'm getting build
errors about not being able to find mach_mpspec.h and mach_apicdef.h

make -C /root/xen-unstable.hg/linux-2.6.18-xen O=/root/xen- 
unstable.hg/build-linux-2.6.18-xen_x86_32 modules
  CC [M]  /root/lkim-old/kernel_modules/modreporter.o
In file included from include2/asm/mach-xen/asm/smp.h:17,
                 from /root/xen-unstable.hg/linux-2.6.18-xen/include/ 
linux/smp.h:18,
                 from /root/xen-unstable.hg/linux-2.6.18-xen/include/ 
linux/sched.h:63,
                 from /root/xen-unstable.hg/linux-2.6.18-xen/include/ 
linux/module.h:9,
                 from /root/modreporter/modreporter.c:22:
include2/asm/mpspec.h:6:25: error: mach_mpspec.h: No such file or  
directory
In file included from include2/asm/mach-xen/asm/smp.h:17,
                 from /root/xen-unstable.hg/linux-2.6.18-xen/include/ 
linux/smp.h:18,
                 from /root/xen-unstable.hg/linux-2.6.18-xen/include/ 
linux/sched.h:63,
                 from /root/xen-unstable.hg/linux-2.6.18-xen/include/ 
linux/module.h:9,
                 from /root/modreporter/modreporter.c:22:
include2/asm/mpspec.h:8: error: ‘MAX_MP_BUSSES’ undeclared here (not  
in a function)
include2/asm/mpspec.h:22: error: ‘MAX_IRQ_SOURCES’ undeclared here  
(not in a function)
In file included from /root/xen-unstable.hg/linux-2.6.18-xen/include/ 
linux/smp.h:18,
                 from /root/xen-unstable.hg/linux-2.6.18-xen/include/ 
linux/sched.h:63,
                 from /root/xen-unstable.hg/linux-2.6.18-xen/include/ 
linux/module.h:9,
                 from /root/modreporter/modreporter.c:22:
include2/asm/mach-xen/asm/smp.h:75:26: error: mach_apicdef.h: No such  
file or directory
 Copying these files from mach-generic or mach-default allows the  
build to proceed.
But on loading the module it receives an error trying to call  
xenbus_mkdir.
Specifically it calls:
        if((ret = xenbus_mkdir(t,"modules" , ""))){
		printk(KERN_ERROR "modreporter: Error making \"modules\" directory:  
%d.\n", ret);
        }

It hits the error condition with error value -22 (-EINVAL).

I used xenstore's trace option, and a number of printk's in the  
xenbus_mkdir path and determined
that the problem seems to be that xenbus_mkdir is not receiving the  
string "modules" as it's argument
(it receives a NULL pointer which gets fed throughout the system  
until the xenstored in dom0 refuses
to make the NULL directory).

Are these errors related?

I've tried building the same module on a non-SMP machine with xen- 
unstable changeset .  On this
machine it doesn't hit the errors about mach_mpspec.h and  
mach_apicdef.h, and is able to create
the xenstore directory.

Thanks,
-aaron
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