[Xen-devel] compilation errors for remus sch_queue for 2.6.31.13-pvops

[Andreas Olsowski <andreas.olsowski@xxxxxxxxxxxxxxx>]

Hi there.

I run Xen 4.0 with 2.6.31.13 pvops dom0 kernel.
My kernel sources reside in /usr/src/linux-2.6-xen, the xen sources in
/usr/src/xen-4.0.0.

Since i did not compile a kernel in the xen sources (just did make xen
tools install-xen install-tools) it does not automagically compile the
kmod stuff for remus.
So if i wanted to compile it while compiling xen i have to edit the
Makefile of tools/remus/kmod:
KERNELDIR = /usr/src/linux-2.6-xen

I figured i could start the compilation manually but i get the same
errors as in the normal "make xen" (of course):
tarballerina:/usr/src/xen-4.0.0/tools/remus/kmod# make -C
/lib/modules/2.6.31.13-xen0/build SUBDIRS=`pwd` modules
make: Entering directory `/usr/src/linux-2.6-xen'
CC [M] /usr/src/xen-4.0.0/tools/remus/kmod/sch_queue.o
/usr/src/xen-4.0.0/tools/remus/kmod/sch_queue.c:19:26: error:
linux/config.h: No such file or directory
/usr/src/xen-4.0.0/tools/remus/kmod/sch_queue.c: In function ‘is_foreign’:
/usr/src/xen-4.0.0/tools/remus/kmod/sch_queue.c:51: error: implicit
declaration of function ‘xen_feature’
/usr/src/xen-4.0.0/tools/remus/kmod/sch_queue.c:51: error:
‘XENFEAT_auto_translated_physmap’ undeclared (first use in this function)
/usr/src/xen-4.0.0/tools/remus/kmod/sch_queue.c:51: error: (Each
undeclared identifier is reported only once
/usr/src/xen-4.0.0/tools/remus/kmod/sch_queue.c:51: error: for each
function it appears in.)
/usr/src/xen-4.0.0/tools/remus/kmod/sch_queue.c:52: error:
‘phys_to_machine_mapping’ undeclared (first use in this function)
/usr/src/xen-4.0.0/tools/remus/kmod/sch_queue.c:52: error:
‘FOREIGN_FRAME_BIT’ undeclared (first use in this function)
/usr/src/xen-4.0.0/tools/remus/kmod/sch_queue.c: In function
‘skb_remove_foreign_references’:
/usr/src/xen-4.0.0/tools/remus/kmod/sch_queue.c:79: error: implicit
declaration of function ‘kmap_skb_frag’
/usr/src/xen-4.0.0/tools/remus/kmod/sch_queue.c:79: warning: assignment
makes pointer from integer without a cast
/usr/src/xen-4.0.0/tools/remus/kmod/sch_queue.c:83: error: implicit
declaration of function ‘kunmap_skb_frag’
/usr/src/xen-4.0.0/tools/remus/kmod/sch_queue.c: In function ‘queue_change’:
/usr/src/xen-4.0.0/tools/remus/kmod/sch_queue.c:177: error: implicit
declaration of function ‘netif_schedule’
/usr/src/xen-4.0.0/tools/remus/kmod/sch_queue.c:177: error: ‘struct
Qdisc’ has no member named ‘dev’
/usr/src/xen-4.0.0/tools/remus/kmod/sch_queue.c: At top level:
/usr/src/xen-4.0.0/tools/remus/kmod/sch_queue.c:195: warning:
initialization from incompatible pointer type
/usr/src/xen-4.0.0/tools/remus/kmod/sch_queue.c:196: warning:
initialization from incompatible pointer type
make[1]: *** [/usr/src/xen-4.0.0/tools/remus/kmod/sch_queue.o] Error 1
make: *** [_module_/usr/src/xen-4.0.0/tools/remus/kmod] Error 2
make: Leaving directory `/usr/src/linux-2.6-xen'

The linux/config.h part leads me to believe that this module was
intended for 2.6.18, but since xen is "shipped" with 2.6.31 this should
not be. Especially since the fault tolerance via remus is one of the
biggest features of 4.0.

Due to a lack of documenation i am unable to compile the kernel module.
Shouldnt the module be part of the kernel and not of xen anyway?

How should i proceed, is there some documentation on how to compile the
sch_queue module for 2.6.31+ kernels?
One user on #xen on freenode told me that he had a running 2.6.32 kernel
with working remus but he used his distribution packages, so its not
impossible i guess.

On a side note: Why does the README in the remus directory point to the
remus project website? That hasnt even been updated since last year and
just has way too little information.
I would be willing to write more detailed stuff for the xensource wiki
once i get remus to work.


best regards

---
Andreas



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