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

Andrew Morton wrote:

William Lee Irwin III <[email protected]> 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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• References:
  • [patch][rfc] 0/5: remove PageReserved
    • From: Nick Piggin <[email protected]>
  • [patch][rfc] 1/5: comment for mm/rmap.c
    • From: Nick Piggin <[email protected]>
  • [patch][rfc] 2/5: micro optimisation for mm/rmap.c
    • From: Nick Piggin <[email protected]>
  • [patch][rfc] 3/5: remove atomic bitop when freeing page
    • From: Nick Piggin <[email protected]>
  • Re: [patch][rfc] 4/5: remap ZERO_PAGE mappings
    • From: Nick Piggin <[email protected]>
  • [patch][rfc] 5/5: core remove PageReserved
    • From: Nick Piggin <[email protected]>
  • Re: [patch][rfc] 5/5: core remove PageReserved
    • From: William Lee Irwin III <[email protected]>
  • Re: [patch][rfc] 5/5: core remove PageReserved
    • From: Andrew Morton <[email protected]>

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