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

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Date: Sat, 4 May 2024 16:14:16 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: kernel test robot <lkp@...el.com>
Cc: Sergey Senozhatsky <senozhatsky@...omium.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	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
Subject: Re: [PATCH 08/14] zram: check that backends array has at least one
 backend

On (24/05/04 14:54), kernel test robot wrote:
>          |                            ~~~~~~~~~~~~~~~~~~~~~~
> >> drivers/block/zram/zcomp.c:214:2: error: call to '__compiletime_assert_285' declared with 'error' attribute: BUILD_BUG_ON failed: ARRAY_SIZE(backends) <= 1
>      214 |         BUILD_BUG_ON(ARRAY_SIZE(backends) <= 1);
>          |         ^

So this is what that BUILD_BUG_ON() is supposed to catch. You don't
have any backends selected in your .config:

# CONFIG_ZRAM_BACKEND_LZO is not set
# CONFIG_ZRAM_BACKEND_LZ4 is not set
# CONFIG_ZRAM_BACKEND_LZ4HC is not set
# CONFIG_ZRAM_BACKEND_ZSTD is not set
# CONFIG_ZRAM_BACKEND_DEFLATE is not set
CONFIG_ZRAM_DEF_COMP="unset-value"

Which is invalid configuration because it means that zram has no
compression enabled.