linux-kernel - Re: [PATCH 0/5] drop unused BACKLIGHT

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Date:   Mon, 30 Nov 2020 22:25:01 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Sam Ravnborg <sam@...nborg.org>
Cc:     Andrey Zhizhikin <andrey.zhizhikin@...ca-geosystems.com>,
        linux@...linux.org.uk, nicolas.ferre@...rochip.com,
        alexandre.belloni@...tlin.com, ludovic.desroches@...rochip.com,
        tony@...mide.com, mripard@...nel.org, wens@...e.org,
        jernej.skrabec@...l.net, thierry.reding@...il.com,
        jonathanh@...dia.com, catalin.marinas@....com, will@...nel.org,
        tsbogend@...ha.franken.de, James.Bottomley@...senpartnership.com,
        deller@....de, mpe@...erman.id.au, benh@...nel.crashing.org,
        paulus@...ba.org, lee.jones@...aro.org, emil.l.velikov@...il.com,
        daniel.thompson@...aro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>
Subject: Re: [PATCH 0/5] drop unused BACKLIGHT_GENERIC option

On Mon, Nov 30, 2020 at 08:11:33PM +0100, Sam Ravnborg wrote:
> On Mon, Nov 30, 2020 at 03:21:32PM +0000, Andrey Zhizhikin wrote:
> > Since the removal of generic_bl driver from the source tree in commit
> > 7ecdea4a0226 ("backlight: generic_bl: Remove this driver as it is
> > unused") BACKLIGHT_GENERIC config option became obsolete as well and
> > therefore subject to clean-up from all configuration files.
> > 
> > This series introduces patches to address this removal, separated by
> > architectures in the kernel tree.
> > 
> > Andrey Zhizhikin (5):
> >   ARM: configs: drop unused BACKLIGHT_GENERIC option
> >   arm64: defconfig: drop unused BACKLIGHT_GENERIC option
> >   MIPS: configs: drop unused BACKLIGHT_GENERIC option
> >   parisc: configs: drop unused BACKLIGHT_GENERIC option
> >   powerpc/configs: drop unused BACKLIGHT_GENERIC option
> 
> For defconfigs I expect arch maintainers to do a make xxxdefconfig / make
> savedefconfig / cp defconfig ... run now and then - this will remove
> all such symbols.

savedefconfig can be tricky because of risk of loosing options:
1. it will remove options which became the default or became selected,
2. later when the default is changed or selecting option is removed, the
   first option from #1 will not be brought back.

This was already for example with DEBUG_FS and the conclusion that time
was - do not run savedefconfig automatically.

Therefore if some symbol(s) can be safely removed, patch is welcomed.

Best regards,
Krzysztof

> 
> If the patches goes in like they are submitted then:
> Acked-by: Sam Ravnborg <sam@...nborg.org>