Bug 209321

+++ This bug was initially created as a clone of Bug #208895 +++

Description of problem:
The kernel/drivers/xen/blktap/blktap.ko module does not build on ia64:

drivers/xen/blktap/blktapmain.c: In function 'fast_flush_area':
drivers/xen/blktap/blktapmain.c:902: error: implicit declaration of function
'create_lookup_pte_addr'

Version-Release number of selected component (if applicable):
kernel-xen-2.6.18-1.2724.fc6.ia64

blktap has been disabled on ia64 for now:
$ grep TAP configs/*xen*
configs/config-xen-generic:CONFIG_XEN_BLKDEV_TAP=m
configs/config-xen-ia64:# CONFIG_XEN_BLKDEV_TAP is not set

-- Additional comment from chrisw on 2006-10-02 11:29 EST --
Created an attachment (id=137553)
blktap compile fix for ia64


-- Additional comment from chrisw on 2006-10-02 11:36 EST --
Here is a patch that gets things building.  It's a bit of a hack since
it copies create_lookup_pte_addr into ia64 specific source files.  With
this patch the thing builds, and boots.  However each of the blkback, netback
and blktap fail with the same error.  Basically none of the backend drivers are
working on ia64, they each fail in balloon_alloc_empty_page_range() due to
failed __get_free_pages() attempt with large order.

-- Additional comment from sct on 2006-10-02 12:15 EST --
Yes; the backend allocating issue is already being tracked as bug 202971.

-- Additional comment from chrisw on 2006-10-02 12:20 EST --
OK, in that case we could apply the blktap fix to get things working to a point
that they can be debugged.

-- Additional comment from prarit on 2006-10-04 12:00 EST --
Assigning to agriffis.