Re: [PATCH v5 07/13] block: Add PCI P2P flag for request queue and check support for requests

[Logan Gunthorpe]

On 05/09/18 01:26 PM, Jens Axboe wrote:
> On 9/3/18 4:26 PM, Logan Gunthorpe wrote:
>> I personally agree with Christoph. But if there's consensus in the other
>> direction or this is a real blocker moving this forward, I can remove it
>> for the next version.
> 
> It's a simple branch because the check isn't exhaustive. It just checks
> the first page. At that point you may as well just require the caller to
> flag the bio/rq as being P2P, and then do a check for P2P compatibility
> with the queue.

Hmm, we had something like that in v4[1] but it just seemed redundant to
create a flag when the information was already in the bio and kind of
ugly for the caller to check for, then set, the flag. I'm not _that_
averse to going back to that though...

Logan

[1]
https://lore.kernel.org/lkml/20180423233046.21476-8-logang@xxxxxxxxxxxx/T/#u