Thread (20 messages) 20 messages, 2 authors, 2021-12-13

Re: [PATCH v2 08/13] dmaengine: at_xdmac: Move the free desc to the tail of the desc list

From: <hidden>
Date: 2021-12-13 09:22:10
Also in: dmaengine, linux-serial, lkml

On 12/13/21 11:00 AM, Vinod Koul wrote:
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On 13-12-21, 14:29, Vinod Koul wrote:
quoted
On 13-12-21, 08:51, Tudor.Ambarus@microchip.com wrote:
quoted
Hi, Vinod,

On 12/13/21 10:07 AM, Vinod Koul wrote:
quoted
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On 25-11-21, 11:00, Tudor Ambarus wrote:
quoted
So that we don't use the same desc over and over again.
Please use full para in the changelog and not a continuation of the
patch title!
Ok, will add a better commit description. Here and in other patches where
your comment applies.
Great!
quoted
quoted
and why is wrong with using same desc over and over? Any benefits of not
doing so?
Not wrong, but if we move the free desc to the tail of the list, then the
sequence of descriptors is more track-able in case of debug. You would
know which descriptor should come next and you could easier catch
concurrency over descriptors for example. I saw virt-dma uses
list_splice_tail_init() as well, I found it a good idea, so I thought to
follow the core driver.
Okay, I would be good to add this motivation in the change log. I am
sure after few you would also wonder why you did this change :)
Sure.
Also, pls submit serial patches to Greg separately. I guess he saw the
title and overlooked those...
I received a private message from Greg informing me that he applied the
patches to tty-next and that they will be merged during the merge window.
So I'll drop the tty patches in v3.

Cheers,
ta
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