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Re: Ping: [PATCH] Argo: drop meaningless mfn_valid() check
- To: Christopher Clark <christopher.w.clark@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 4 Jan 2024 09:12:06 +0100
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 04 Jan 2024 08:12:09 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 23.12.2023 22:35, Christopher Clark wrote:
> On Sat, Dec 23, 2023 at 12:47 PM Christopher Clark
> <christopher.w.clark@xxxxxxxxx> wrote:
>>
>> On Sun, Dec 17, 2023 at 11:55 PM Jan Beulich <jbeulich@xxxxxxxx> wrote:
>>>
>>> Christopher,
>>>
>>> On 27.11.2023 14:55, Jan Beulich wrote:
>>>> Holding a valid struct page_info * in hands already means the referenced
>>>> MFN is valid; there's no need to check that again. Convert the checking
>>>> logic to a switch(), to help keeping the extra (and questionable) x86-
>>>> only check in somewhat tidy shape.
>>>>
>>>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>>
>> Reviewed-by: Christopher Clark <christopher.w.clark@xxxxxxxxx>
>
> I'd like to hold off on this just yet, sorry -- the change does look
> ok as far as a transform being applied the prior logic and the
> necessity of the check, but with it applied, it's not obvious that it
> handles all the page types as best that it could there, so I'd like to
> look at this (and the previously submitted patch again) please.
I'm puzzled: This patch merely removes a pointless check. Whatever is
lacking with it in place will have been lacking before. Also can you
please give a rough estimate towards when you'll be getting back on
this, or ideally on both patches?
Jan
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