linux-kernel - Re: [PATCH 0/2] arm64 defconfig: Get faddr2line working

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Date:   Mon, 25 Jul 2022 18:39:43 +0100
From:   John Garry <john.garry@...wei.com>
To:     Arnd Bergmann <arnd@...db.de>
CC:     Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Olof Johansson <olof@...om.net>, SoC Team <soc@...nel.org>,
        <jpoimboe@...nel.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] arm64 defconfig: Get faddr2line working

On 25/07/2022 15:22, Arnd Bergmann wrote:
>> INTERCONNECT has no dependencies, so "select" - like for MAILBOX -
>> should be fine, I suppose
> There are a couple of trade-offs between the two approaches.
> The main advantage of 'select' is that you can enable drivers more
> easily and all the required subsystems are there automatically.
> The advantage of 'depends on' is that it becomes easier to disable
> entire subsystems that one may not need.
> 
> Which of those two is more important is of course a matter of perspective,
> I like to be able to turn things off more easily because that makes it
> possible to test the corner cases with randconfig more easily, and it
> helps produce size-reduced kernels for embedded systems.
> 
> Another aspect is that we overall have more 'depends on' than 'select',
> and sticking with the more common way avoids circular dependencies,
> both within an area of the kernel and overall.
> 
> The rule that I tend to follow with 'select' is to only use it on symbols
> that you don't even want to show to users. If a feature is part of
> a library (think zlib), then each user just needs to select the symbol
> but you never actually have to decide whether to show it or not.

ok, seems reasonable. Personally I dislike 'select' for all the common 
reasons.

> 
>>>> And would each config item deletion merit a separate patch?
>>> You send a combined patch for the obvious ones (secccomp
>>> and mailbox AFAICT) or send them separately. For the other ones I think
>>> we should try fixing the Kconfig files first, otherwise we just end up
>>> putting them back afterwards.
>> ok, fine. I'll deal with the obvious changes first plus
>> CONFIG_DEBUG_INFO and then the non-obvious, non-trivial ones. I'll base
>> on your arm/defconfig branch (for defconfig changes).
> The CONFIG_DEBUG_INFO one should be fixed by my series from
> last week already, do you still see another issue with that?

Ah, I thought that you re-enabled CONFIG_DEBUG_INFO for only the arm32 
configs but see that you also re-enabled for arm64 defconfig as well.

> I actually
> have another patch to fix up all the non-Arm defconfigs for this one as
> well, but haven't sent that one yet.

Thanks,
John