Re: [Xen-devel] [PATCH][PVFB][LINUX] Fix possible sleep while holding spinlock

[Markus Armbruster <armbru@xxxxxxxxxx>]

Keir Fraser <keir@xxxxxxxxxxxxx> writes:

> On 15/12/06 16:38, "Markus Armbruster" <armbru@xxxxxxxxxx> wrote:
>
>> This patch fixes the locking, but leaves open a race between
>> xenfb_update_screen() and do_no_page().  See the source code for a
>> detailed explanation of how it works, and where it fails.
>
> That's a bit of a shame. Is there any way we could use do_file_page() and
> have a populate hook (which gets to install the PTE itself)? Or are there
> lots of assumptions about VMAs that would take this path, assert
> VM_NONLINEAR, etc?
>
>  -- Keir

My colleages and I suspect we need a deep think about the problem.
But right now we can't spare the time for that.

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