linux-kernel - Re: [PATCH 08/14] zram: check that backends array has at least one backend

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Date: Mon, 6 May 2024 12:22:07 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Andrew Morton <akpm@...ux-foundation.org>, linux-kbuild@...r.kernel.org
Cc: kernel test robot <lkp@...el.com>, Minchan Kim <minchan@...nel.org>,
	llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	Linux Memory Management List <linux-mm@...ck.org>,
	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
	Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: Re: [PATCH 08/14] zram: check that backends array has at least one
 backend

On (24/05/05 15:48), Sergey Senozhatsky wrote:
> On (24/05/05 14:13), Sergey Senozhatsky wrote:
> > On (24/05/05 13:39), Sergey Senozhatsky wrote:
> > [..]
> > > > I guess just pick one if none were selected.
> > 
> > How do I pick one if none were selected? Does Kconfig support
> > something like that?
> 
> This triggers Kconfig error:
> 
> config ZRAM_EMPTY_BACKENDS_FIXUP
>        bool
>        depends on ZRAM && !ZRAM_BACKEND_LZO && !ZRAM_BACKEND_LZ4 && \
>                !ZRAM_BACKEND_LZ4HC && !ZRAM_BACKEND_ZSTD && \
>                !ZRAM_BACKEND_DEFLATE
>        select ZRAM_BACKEND_LZO
> 
> 
> drivers/block/zram/Kconfig:17:error: recursive dependency detected!
> drivers/block/zram/Kconfig:17:  symbol ZRAM_BACKEND_LZO is selected by ZRAM_EMPTY_BACKENDS_FIXUP
> drivers/block/zram/Kconfig:52:  symbol ZRAM_EMPTY_BACKENDS_FIXUP depends on ZRAM_BACKEND_LZO
> 
> 
> I'm a little surprised by this - EMPTY_BACKENDS_FIXUP does not depend
> on ZRAM_BACKEND_LZO, it depends on NOT ZRAM_BACKEND_LZO.
> 
> Let me Cc linux-kbuild. Kbuild folks, how do I workaround this?

Is this how one does it?

config ZRAM_BACKEND_LZO
       bool "lzo and lzo-rle compression support"
       depends on ZRAM
       default y if !ZRAM_BACKEND_LZ4 && !ZRAM_BACKEND_LZ4HC && \
               !ZRAM_BACKEND_ZSTD && !ZRAM_BACKEND_DEFLATE
       default n
       select LZO_COMPRESS
       select LZO_DECOMPRESS


User still can select N and then we'll have empty backends, but
at least default is Y if none of the algorithms were selected.
Is it good enough?