[Xen-devel] Oops from loop driver on IA64

[Kouya SHIMURA <kouya@xxxxxxxxxxxxxx>]

Hi all,

We encounter a Oops message from loop driver when vbd is used
in dom0 kernel with CONFIG_VIRTUAL_MEM_MAP on ia64.

I investigated this and might find a serious bug.
On x86, flush_dcache_page() does nothing and there is no problem.
But on ia64 flush_dcache_page() might access a wrong page struct
and destroy the kernel memory.

Attached patch fixes this problem but it seems bad idea to modify
a linux driver. How should we fix it?

Regards,
Kouya

Signed-off-by: Kouya Shimura <kouya@xxxxxxxxxxxxxx>

Attachment: loop.patch
Description: Binary data

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