Re: [PATCH v1] mm/gup: adjust stale comment for RCU GUP-fast

[David Hildenbrand]

>>> It can be dropped later if you want to rework the thp collapse side and
>>> finally remove IPI dependency on fast-gup, but so far it seems to me it's
>>> still needed.  Or just drop this patch until that rework happens?
>>
>> The doc as is is obviously stale, why drop this patch?
>>
>> We should see a fix for the THP collapse issue very soon I guess. Most
>> probably this patch will go upstream after that fix.
> 
> No objection to have this patch alone as the removal statement is only
> about "thp split".  But IMHO this patch alone didn't really help a great
> lot, especially if you plan to have more to come that is very relevant to
> this, so it'll be clearer to put them together.  Your call.

I can hold off the resend until the the fix is in place. Then I can add
to the description that we are not aware of remaining IPI dependencies,
and one undocumented case was broken and got fixed without the need for
IPIs.

Thanks!


-- 
Thanks,

David / dhildenb