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SubjectRe: 4GB+DEBUG_PAGEALLOC oopses with 2.6.0-test3-mm1
Ingo Molnar wrote:

> Exactly that happens.
>>I'm running with CONFIG_PAGE_DEBUG, i.e. unallocated pages are marked as
>>non-present in the linear mapping.
>this is not a bug technically, unless the mount options are in the last
>linearly mapped page. It is a bug to copy those unallocated bytes, but
>they do not get to relied upon. Note that the non-4G code copies them just
>as much.
Or unless there are holes in the memory map, or unless pages were
unmapped from the kernel linear mapping for GART.
IMHO the currect code is unacceptable.
It is possible to use direct_copy_ instead of memcpy for fs==KERNEL_DS
in mm/usercopy.c?


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