On 3/3/21 3:05 AM, Mikulas Patocka wrote:
> Don't clear REQ_HIPRI for bio-based drivers. Device mapper will need to
> see this flag in order to support polling.
>
> Signed-off-by: Mikulas Patocka <[email protected]>
>
> ---
> block/blk-core.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> Index: linux-2.6/block/blk-core.c
> ===================================================================
> --- linux-2.6.orig/block/blk-core.c 2021-03-02 10:43:28.000000000 +0100
> +++ linux-2.6/block/blk-core.c 2021-03-02 10:53:50.000000000 +0100
I notice that the diff header indicates that the code base is from
linux-2.6. Or it's just the name of your directory, while the code base
is for the latest upstream 5.12?
> @@ -836,7 +836,7 @@ static noinline_for_stack bool submit_bi
> }
> }
>
> - if (!test_bit(QUEUE_FLAG_POLL, &q->queue_flags))
> + if (!test_bit(QUEUE_FLAG_POLL, &q->queue_flags) &&
> !bdev->bd_disk->fops->submit_bio)
> bio->bi_opf &= ~REQ_HIPRI;
>
> switch (bio_op(bio)) {
>
> --
What if dm device is built upon mq devices that are not capable of
polling, i.e., mq devices without QUEUE_FLAG_POLL set? Then this dm
device shall not support polling.
--
Thanks,
Jeffle
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