Messages in this thread | | | From | James Houghton <> | Date | Thu, 23 Feb 2023 09:31:26 -0800 | Subject | Re: [PATCH v2 3/5] mm: userfaultfd: combine 'mode' and 'wp_copy' arguments |
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On Wed, Feb 22, 2023 at 4:58 PM Axel Rasmussen <axelrasmussen@google.com> wrote: > > Many userfaultfd ioctl functions take both a 'mode' and a 'wp_copy' > argument. In future commits we plan to plumb the flags through to more > places, so we'd be proliferating the very long argument list even > further. > > Let's take the time to simplify the argument list. Combine the two > arguments into one - and generalize, so when we add more flags in the > future, it doesn't imply more function arguments. > > Since the modes (copy, zeropage, continue) are mutually exclusive, store > them as an integer value (0, 1, 2) in the low bits. Place combine-able > flag bits in the high bits. > > Signed-off-by: Axel Rasmussen <axelrasmussen@google.com>
Acked-by: James Houghton <jthoughton@google.com>
I don't see anything wrong with this patch. Thanks, Axel.
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