[Patch] fix vDSO paravirtualization for fedora-xen-ia64 (is Re: [Fedora-xen] Re: [Xen-ia64-devel] Fedora-xen-ia64 test status)

[Akio Takebe]

Hi,

The following error messages are occurred by a bug of vDSO 
paravirtualization. (Thanks, Isaku.)
This fix of Isaku has been commited in xen-ia64-unstable,
but has not been commited in xen-unstable yet.

So this patch need to is commit to fedora-kernel
util fedora-kernel catch up with current xen-ia64-unstable.

================================
BUG: sleeping function called from invalid context at kernel/rwsem.c:20
in_atomic():0, irqs_disabled():1

Call Trace:
 [<a00000010001c7a0>] show_stack+0x40/0xa0
                                sp=e00000002f7dfbb0 bsp=e00000002f7d91a8
 [<a00000010001c830>] dump_stack+0x30/0x60
                                sp=e00000002f7dfd80 bsp=e00000002f7d9190
 [<a00000010006c920>] __might_sleep+0x2a0/0x2c0
                                sp=e00000002f7dfd80 bsp=e00000002f7d9168
 [<a0000001000bce80>] down_read+0x20/0x60
                                sp=e00000002f7dfd80 bsp=e00000002f7d9148
 [<a0000001005b14f0>] ia64_do_page_fault+0x110/0x9e0
                                sp=e00000002f7dfd80 bsp=e00000002f7d90f8
 [<a000000100064be0>] xen_leave_kernel+0x0/0x3b0
                                sp=e00000002f7dfe30 bsp=e00000002f7d90f8
================================

The below is F.Y.I.
http://lists.xensource.com/archives/html/xen-ia64-devel/2006-08/msg00042.html

Best Regards,

Akio Takebe
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