linux-kernel - Re: [PATCH 2/3] Kconfig: improve handling for all{rand,yes,no,}.config fragments

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Date:   Tue, 20 Feb 2018 10:59:49 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        "Yann E. MORIN" <yann.morin.1998@...e.fr>,
        Michal Marek <mmarek@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] Kconfig: improve handling for all{rand,yes,no,}.config
 fragments

On Tue, Feb 20, 2018 at 10:26 AM, Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
> 2018-02-17 6:41 GMT+09:00 Arnd Bergmann <arnd@...db.de>:

>> @@ -621,14 +622,24 @@ int main(int ac, char **av)
>>                 case randconfig:        name = "allrandom.config"; break;
>>                 default: break;
>>                 }
>> -               if (conf_read_simple(name, S_DEF_USER) &&
>> -                   conf_read_simple("all.config", S_DEF_USER)) {
>> -                       fprintf(stderr,
>> -                               _("*** KCONFIG_ALLCONFIG set, but no \"%s\" or \"all.config\" file found\n"),
>> -                               name);
>> -                       exit(1);
>> +               /* try ./name, arch/$(ARCH)/configs/name and kernel/config/name */
>> +               if (!conf_read_simple(name, S_DEF_USER))
>> +                       break;
>> +               arch = getenv("ARCH");
>> +               if (arch) {
>> +                       snprintf(fullname, sizeof(fullname), "arch/%s/configs/%s",
>> +                                arch, name);
>> +                       if (!conf_read_simple(fullname, S_DEF_USER))
>> +                               break;
>>                 }
>
>
> I am not a big fan of hard-coding the kernel directory structure.
>
> We already do this [1], but I am thinking of kicking this out.
> [1] https://github.com/torvalds/linux/blob/v4.16-rc1/scripts/kconfig/confdata.c#L33

Ok, I see. How about adding a way to detect that we are build-testing
with randconfig instead?

> BTW, I am trying to compiler capability check to Kconfig.
> If this work is done, I hope some "depends on !COMPILE_TEST" will go
> away (but not all?)
> https://patchwork.kernel.org/patch/10225375/

I think most of the 'depends on !COMPILE_TEST' are for cases that
impact compile-testing in some way (more false-positive warnings,
fewer real warnings, much slower compile speed), rather than a lack
of check for a specific compiler version.

We might be able to replace the CONFIG_STANDALONE and
CONFIG_PREVENT_FIRMWARE_BUILD with Kconfig $(shell)
checks if you think that leads to an improvement.

        Arnd