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

From: Sergey Senozhatsky
Date: Sat May 04 2024 - 03:14:53 EST


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.