Re: [patch][rfc] 5/5: core remove PageReserved

[Nick Piggin]

Andrew Morton wrote:
> William Lee Irwin III <wli@xxxxxxxxxxxxxx> wrote:

> > Mutatis mutandis for my SCSI tape drive.

OK, for the VM_RESERVED case, it looks like it won't be much of a problem
because get_user_pages faults on VM_IO regions (which is already set in
remap_pfn_range which is used by mem.c and most drivers). So this code will
simply not encounter VM_RESERVED regions - well obviously, get_user_pages
should be made to explicitly check for VM_RESERVED too, but the point being
that introducing such a check will not overly restrict drivers.

[snip SetPageDirty is wrong]

Not that this helps the existing bug...

--
SUSE Labs, Novell Inc.

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