linux-kernel - Re: [PATCH] drivers: infiniband: sw: rxe: fix kconfig dependency on CRYPTO

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Date:   Mon, 22 Feb 2021 08:53:51 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Leon Romanovsky <leon@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Zhu Yanjun <zyjzyj2000@...il.com>,
        Julian Braha <julianbraha@...il.com>,
        Doug Ledford <dledford@...hat.com>,
        RDMA mailing list <linux-rdma@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drivers: infiniband: sw: rxe: fix kconfig dependency on
 CRYPTO

On 2/22/21 8:46 AM, Jason Gunthorpe wrote:
> On Mon, Feb 22, 2021 at 08:26:10AM -0800, Randy Dunlap wrote:
>> On 2/22/21 7:58 AM, Jason Gunthorpe wrote:
>>> On Mon, Feb 22, 2021 at 03:00:03PM +0200, Leon Romanovsky wrote:
>>>> On Mon, Feb 22, 2021 at 10:39:20AM +0800, Zhu Yanjun wrote:
>>>>> On Sun, Feb 21, 2021 at 2:49 PM Leon Romanovsky <leon@...nel.org> wrote:
>>>>>>
>>>>>> On Fri, Feb 19, 2021 at 06:32:26PM -0500, Julian Braha wrote:
>>>>>>> commit 6e61907779ba99af785f5b2397a84077c289888a
>>>>>>> Author: Julian Braha <julianbraha@...il.com>
>>>>>>> Date:   Fri Feb 19 18:20:57 2021 -0500
>>>>>>>
>>>>>>>     drivers: infiniband: sw: rxe: fix kconfig dependency on CRYPTO
>>>>>>>
>>>>>>>     When RDMA_RXE is enabled and CRYPTO is disabled,
>>>>>>>     Kbuild gives the following warning:
>>>>>>>
>>>>>>>     WARNING: unmet direct dependencies detected for CRYPTO_CRC32
>>>>>>>       Depends on [n]: CRYPTO [=n]
>>>>>>>       Selected by [y]:
>>>>>>>       - RDMA_RXE [=y] && (INFINIBAND_USER_ACCESS [=y] || !INFINIBAND_USER_ACCESS [=y]) && INET [=y] && PCI [=y] && INFINIBAND [=y] && INFINIBAND_VIRT_DMA [=y]
>>>>>>>
>>>>>>>     This is because RDMA_RXE selects CRYPTO_CRC32,
>>>>>>>     without depending on or selecting CRYPTO, despite that config option
>>>>>>>     being subordinate to CRYPTO.
>>>>>>>
>>>>>>>     Signed-off-by: Julian Braha <julianbraha@...il.com>
>>>>>>
>>>>>> Please use git sent-email to send patches and please fix crypto Kconfig
>>>>>> to enable CRYPTO if CRYPTO_* selected.
>>>>>>
>>>>>> It is a little bit awkward to request all users of CRYPTO_* to request
>>>>>> select CRYPTO too.
>>>>>
>>>>> The same issue and similar patch is in this link:
>>>>>
>>>>> https://patchwork.kernel.org/project/linux-rdma/patch/20200915101559.33292-1-fazilyildiran@gmail.com/#23615747
>>>>
>>>> So what prevents us from fixing CRYPTO Kconfig?
>>>
>>> Yes, I would like to see someone deal with this properly, either every
>>> place doing select CRYPTO_XX needs fixing or something needs to be
>>> done in the crypto layer.
>>>
>>> I have no idea about kconfig to give advice, I've added Arnd since he
>>> always seems to know :)
>>
>> I will Ack the original patch in this thread.
> 
> The one from Julian?

Yes.

> 
>> How many Mellanox drivers are you concerned about?
> 
> ?? This is about rxe

OK.

>> You don't have to fix any other drivers that have a similar issue.
> 
> Why shouldn't they be fixed too?

Of course, but it's not just on you and/or Leon to fix them.

> There is nearly 1000 places that use a 'select CRYPTO_*' in the
> kernel.
> 
> I see only 60 'select CRYPTO' statements.

Correct. :(
We (community) tend to fix bug reports, not do global audits
to see what needs to be fixed (with a few exceptions).


I'll gladly wait to see what Arnd says.

-- 
~Randy