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From: John Garry <john.garry@huawei.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
	"James E.J. Bottomley" <jejb@linux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	Alim Akhtar <alim.akhtar@samsung.com>,
	"Avri Altman" <avri.altman@wdc.com>,
	Doug Gilbert <dgilbert@interlog.com>,
	<linux-scsi@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/4] scsi: core: constify pointer to scsi_host_template
Date: Fri, 8 Apr 2022 13:57:52 +0100	[thread overview]
Message-ID: <7b3885e3-dbae-ff0b-21dc-c28d635d950b@huawei.com> (raw)
In-Reply-To: <4c3be5b6-50ef-9e9a-6cee-9642df943342@linaro.org>

On 08/04/2022 13:32, Krzysztof Kozlowski wrote:
> On 08/04/2022 14:14, John Garry wrote:
>> On 08/04/2022 11:30, Krzysztof Kozlowski wrote:
>>> Several pointers to 'struct scsi_host_template' do not modify it, so
>>> made them const for safety.
>>>
>> Is this standard practice? What is so special here?
> This is standard practice and there is nothing special here. Pointers to
> const are preferred because:
> 1. They add safety if data is actually const. This is not yet the case,
> but scsi_host_template allocation could be made const with some effort.

To me this seems better, but I think that some drivers might modify 
their scsi_host_template (so not possible)

> 2. The more const variables, the easier function contents and its impact
> is to understand. This is actually the biggest benefit when dealing with
> code touching different structures.
> 
> In general, constifying is a common practice everywhere in the kernel.

Thanks,
John

  reply	other threads:[~2022-04-08 12:58 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-08 10:30 [PATCH 1/4] scsi: core: constify pointer to scsi_host_template Krzysztof Kozlowski
2022-04-08 10:30 ` [PATCH 2/4] scsi: core: fix white-spaces Krzysztof Kozlowski
2022-05-04  8:47   ` Krzysztof Kozlowski
2022-04-08 10:30 ` [PATCH 3/4] scsi: ufs: ufshcd-pltfrm: constify pointed data Krzysztof Kozlowski
2022-04-08 10:30 ` [PATCH 4/4] scsi: ufs: ufshcd: " Krzysztof Kozlowski
2022-04-08 14:35   ` Bart Van Assche
2022-04-08 12:14 ` [PATCH 1/4] scsi: core: constify pointer to scsi_host_template John Garry
2022-04-08 12:32   ` Krzysztof Kozlowski
2022-04-08 12:57     ` John Garry [this message]
2022-04-08 19:31       ` Ewan D. Milne
2022-04-12  7:57         ` John Garry
2022-04-20  7:03           ` Christoph Hellwig
2022-04-25  8:58             ` John Garry
2022-04-25  9:22               ` Krzysztof Kozlowski
2022-04-25 13:04                 ` John Garry
2022-04-26  1:16                   ` Bart Van Assche
2022-04-26  1:54                     ` Douglas Gilbert
2022-04-26  4:13                       ` Bart Van Assche
2022-04-27  1:47                         ` Douglas Gilbert
2022-05-06 16:42                   ` Krzysztof Kozlowski
2022-05-09 11:28                     ` John Garry
2022-05-09 13:20                       ` Krzysztof Kozlowski
2022-05-09 14:50                         ` John Garry
2022-05-11  8:31                           ` Christoph Hellwig

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