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From: Steffen Maier <maier@linux.ibm.com>
To: Christoph Hellwig <hch@lst.de>
Cc: Jens Axboe <axboe@kernel.dk>, Khalid Aziz <khalid@gonehiking.org>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	Matthew Wilcox <willy@infradead.org>,
	Hannes Reinecke <hare@suse.com>,
	Ondrej Zary <linux@rainbow-software.org>,
	linux-block@vger.kernel.org, linux-scsi@vger.kernel.org,
	Hannes Reinecke <hare@suse.de>,
	Benjamin Block <bblock@linux.ibm.com>,
	linux-s390 <linux-s390@vger.kernel.org>
Subject: Re: [PATCH 5/8] scsi: remove the unchecked_isa_dma flag
Date: Mon, 12 Apr 2021 16:04:07 +0200	[thread overview]
Message-ID: <ad37abab-6a23-bd44-f2d7-47dde4a21ac3@linux.ibm.com> (raw)
In-Reply-To: <20210410065231.GA16173@lst.de>

On 4/10/21 8:52 AM, Christoph Hellwig wrote:
> On Fri, Apr 09, 2021 at 05:46:09PM +0200, Steffen Maier wrote:
>> Is it OK to remove a long standing sysfs attribute?
>> Was there any deprecation phase?
>>
>> I just noticed it in our CI reporting fails due to this change since at
>> least linux-next 20210409. Suppose it came via
>> https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/commit/?h=for-5.13/block&id=aaff5ebaa2694f283b7d07fdd55fb287ffc4f1e9
>>
>> Wanted to ask before I adapt the test cases.
> 
> What does your CI do with it?

We check almost all zfcp-related sysfs attributes for returning expected values 
(depending on possible error inject state transitions as well as steady state).
The Scsi_Host's unchecked_isa_dma is just checked to return '0'.

> It would be kinda of sad to carry around this baggage, but if real
> userspace is broken by the chance we'll have to do it.  I'm just not
> entirely sure testcases qualify as real userspace yet.

I was more pondering whether sysfs is considered stable API.

I'm not aware of any issues with real userspace if unchecked_isa_dma is absent.
Have adapted our test case to accept a missing unchecked_isa_dma sysfs attribute.

-- 
Mit freundlichen Gruessen / Kind regards
Steffen Maier

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  reply	other threads:[~2021-04-12 14:04 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-31  7:29 start removing block bounce buffering support v3 Christoph Hellwig
2021-03-31  7:29 ` [PATCH 1/8] aha1542: use a local bounce buffer Christoph Hellwig
2021-03-31  7:29 ` [PATCH 2/8] Buslogic: remove ISA support Christoph Hellwig
2021-03-31 18:24   ` Khalid Aziz
2021-04-03 16:58   ` Maciej W. Rozycki
2021-04-06  6:27     ` Christoph Hellwig
2021-04-06 15:42       ` Maciej W. Rozycki
2021-04-12 12:26     ` Maciej W. Rozycki
2021-03-31  7:29 ` [PATCH 3/8] BusLogic: reject broken old firmware that requires ISA-style bounce buffering Christoph Hellwig
2021-03-31  7:29 ` [PATCH 4/8] advansys: remove ISA support Christoph Hellwig
2021-03-31  7:59   ` Hannes Reinecke
2021-03-31  7:29 ` [PATCH 5/8] scsi: remove the unchecked_isa_dma flag Christoph Hellwig
2021-04-09 15:46   ` Steffen Maier
2021-04-10  6:52     ` Christoph Hellwig
2021-04-12 14:04       ` Steffen Maier [this message]
2021-03-31  7:29 ` [PATCH 6/8] block: remove BLK_BOUNCE_ISA support Christoph Hellwig
2021-03-31  7:30 ` [PATCH 7/8] block: refactor the bounce buffering code Christoph Hellwig
2021-03-31  7:30 ` [PATCH 8/8] block: stop calling blk_queue_bounce for passthrough requests Christoph Hellwig
2021-04-08 21:45   ` Guenter Roeck
2021-04-09  7:40     ` Christoph Hellwig
2021-04-09 13:04       ` Guenter Roeck
2021-04-06 15:28 ` start removing block bounce buffering support v3 Jens Axboe
  -- strict thread matches above, loose matches on Subject: below --
2021-03-26  5:58 start removing block bounce buffering support v2 Christoph Hellwig
2021-03-26  5:58 ` [PATCH 5/8] scsi: remove the unchecked_isa_dma flag Christoph Hellwig
2021-03-29  6:31   ` Hannes Reinecke
2021-03-18  6:39 start removing block bounce buffering support Christoph Hellwig
2021-03-18  6:39 ` [PATCH 5/8] scsi: remove the unchecked_isa_dma flag Christoph Hellwig

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