Re: [PATCH] romfs: only select BUFFER_HEAD for the block based path

[Li Zetao <lizetao1@huawei.com>]

Hi Christoph,

On 2023/8/4 18:26, Christoph Hellwig wrote:
> selecting BUFFER_HEAD unconditionally does not work as romfs can also
> be built with only the MTD backend and thus without CONFIG_BLOCK.
> 
> Fixes: 0f842210d97a ("fs/Kconfig: Fix compile error for romfs")
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>   fs/romfs/Kconfig | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/romfs/Kconfig b/fs/romfs/Kconfig
> index 3f6b550eee6192..f24a96a331af1b 100644
> --- a/fs/romfs/Kconfig
> +++ b/fs/romfs/Kconfig
> @@ -2,7 +2,6 @@
>   config ROMFS_FS
>   	tristate "ROM file system support"
>   	depends on BLOCK || MTD
> -	select BUFFER_HEAD
>   	help
>   	  This is a very small read-only file system mainly intended for
>   	  initial ram disks of installation disks, but it could be used for
> @@ -58,6 +57,7 @@ endchoice
>   config ROMFS_ON_BLOCK
>   	bool
>   	default y if ROMFS_BACKED_BY_BLOCK || ROMFS_BACKED_BY_BOTH
> +	select BUFFER_HEAD
>   
>   config ROMFS_ON_MTD
>   	bool

I have tested the patch on my environment and it resolves the two 
compile errors reported by kernel test robot. The links are as follows:

Link1: 
https://lore.kernel.org/oe-kbuild-all/202308031810.pQzGmR1v-lkp@intel.com/
Link2: 
https://lore.kernel.org/oe-kbuild-all/202308041329.6SK97Asr-lkp@intel.com/

Tested-by: Li Zetao <lizetao1@huawei.com>

Thanks,
Li Zetao