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From: Sergey Senozhatsky <senozhatsky@chromium.org>
To: Andrew Morton <akpm@linux-foundation.org>, linux-kbuild@vger.kernel.org
Cc: kernel test robot <lkp@intel.com>,
	Minchan Kim <minchan@kernel.org>,
	llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev,
	Linux Memory Management List <linux-mm@kvack.org>,
	linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
	Sergey Senozhatsky <senozhatsky@chromium.org>
Subject: Re: [PATCH 08/14] zram: check that backends array has at least one backend
Date: Sun, 5 May 2024 15:48:32 +0900	[thread overview]
Message-ID: <20240505064832.GC8623@google.com> (raw)
In-Reply-To: <20240505051305.GB8623@google.com>

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?

       reply	other threads:[~2024-05-05  6:48 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20240503091823.3616962-9-senozhatsky@chromium.org>
     [not found] ` <202405041440.UTBQZAaf-lkp@intel.com>
     [not found]   ` <20240504071416.GH14947@google.com>
     [not found]     ` <20240504161004.f5a0aab5e5aa1033d4696c20@linux-foundation.org>
     [not found]       ` <20240505043957.GA8623@google.com>
     [not found]         ` <20240505051305.GB8623@google.com>
2024-05-05  6:48           ` Sergey Senozhatsky [this message]
2024-05-06  3:22             ` [PATCH 08/14] zram: check that backends array has at least one backend Sergey Senozhatsky
2024-05-06  5:20               ` Masahiro Yamada
2024-05-06  6:43                 ` Sergey Senozhatsky

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