linux-kernel - Re: [PATCH] habanalabs: select CRC32

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Date:   Mon, 11 Oct 2021 21:37:13 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Vegard Nossum <vegard.nossum@...cle.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Oded Gabbay <ogabbay@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] habanalabs: select CRC32

On Mon, Oct 11, 2021 at 6:29 PM Vegard Nossum <vegard.nossum@...cle.com> wrote:
> On 10/11/21 5:33 PM, Arnd Bergmann wrote:
> I'm working on a couple of new make targets, satconfig and
> satrandconfig, which can generate .configs that respect a set of choices
> specified in a .satconfig file (and, of course, the Kconfig files).
>
> In this case, I was just doing satrandconfig builds and noticed that the
> crc32_le ones popped up quite often so I just added CONFIG_CRC32=n to my
> .satconfig, which means that satrandconfig will generate only configs
> that have CRC32=n.

Ah nice! I had gone through some of those last year, but it was a rather
tedious manual process, and having some tool for it sound really
useful.

> I also suspect that satrandconfig samples the configuration space MUCH
> more uniformly than randconfig, in the sense that "make randconfig" will
> tend to have CRC32 enabled just because there are so many drivers that
> _do_ select it. (Think of it this way, every prompt for an option that
> has "select CRC32" in it will be another 50% probability of actually
> enabling the option.)

Yes, of course. I've seen other problems like this often happen with

CONFIG_I2C=m
CONFIG_LEDS_CLASS=m
CONFIG_IPV6=m
CONFIG_CRYPTO=m
CONFIG_PM_SLEEP=n

Not sure if you're already hitting those or if you need to add something
to your setup to make those more easy to find.

> I just tried doing 'make randconfig' 100 times and the result was>
> This project itself is about 11 years old, but I made a breakthrough
> recently and I'm polishing the patches for submission now. I thought I
> would try to fix the breakage that I could find first so it doesn't
> appear as if the tool itself is broken... (that's not to say it doesn't
> have any bugs, however!)

Sounds great.

       Arnd