On 06/16/2010 11:49 AM, Andi Kleen wrote:
The page is fine, the page tables are not. Another task can munmap() the
thing while is_hwpoison_address() is running.
Ok that boils down to me not seeing that source.
If it accesses the page tables yes then it's racy. But whoever
looked up the page tables in the first place should have
returned an -EFAULT. There's no useful address attached
to poison.
We need to distinguish between genuine -EFAULT and poisoned address.
That's why I suggested get_user_pages_ptes_fast. You can return page =
NULL (-EFAULT) and the pte in the same go. No race, and useful for
other cases.
--
error compiling committee.c: too many arguments to function
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