linux-kernel - Re: [PATCH -next] btrfs: Select LIBCRC32C again

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Date:   Tue, 9 Jul 2019 09:10:31 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>
Cc:     linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        David Sterba <dsterba@...e.com>
Subject: Re: [PATCH -next] btrfs: Select LIBCRC32C again

On Mon, Jul 08, 2019 at 06:43:23AM -0700, Guenter Roeck wrote:
> With CONFIG_BTRFS_FS=y and CONFIG_CRYPTO_CRC32C=m, we get:
> 
> fs/btrfs/super.o: In function `btrfs_mount_root':
> fs/btrfs/super.c:1557: undefined reference to `crc32c_impl'
> fs/btrfs/super.o: In function `btrfs_print_mod_info':
> fs/btrfs/super.c:2348: undefined reference to `crc32c_impl'
> fs/btrfs/extent-tree.o: In function `btrfs_crc32c':
> fs/btrfs/ctree.h:2609: undefined reference to `crc32c'
> fs/btrfs/ctree.h:2609: undefined reference to `crc32c'
> fs/btrfs/ctree.h:2609: undefined reference to `crc32c'
> fs/btrfs/dir-item.o: In function `btrfs_name_hash':
> fs/btrfs/ctree.h:2619: undefined reference to `crc32c'
> fs/btrfs/ctree.h:2619: undefined reference to `crc32c'
> 
> and more.
> 
> Note that the comment in the offending commit "The module dependency on
> crc32c is preserved via MODULE_SOFTDEP("pre: crc32c"), which was previously
> provided by LIBCRC32C config option doing the same." is wrong, since it
> permits CONFIG_BTRFS_FS=y in combination with CONFIG_CRYPTO_CRC32C=m.
> 

Meh, that should have been CONFIG_LIBCRC32C=m. Sorry for the confusion.

Anyway, I'll select CONFIG_LIBCRC32C=y in conjunction with CONFIG_BTRFS_FS=y
in my own build/boot tests going forward. That won't fix the problem, but
it will avoid loss of test coverage.

Guenter

> Cc: David Sterba <dsterba@...e.com>
> Fixes: d5178578bcd4 ("btrfs: directly call into crypto framework for checksumming")
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
>  fs/btrfs/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/fs/btrfs/Kconfig b/fs/btrfs/Kconfig
> index 212b4a854f2c..4c80c70597f9 100644
> --- a/fs/btrfs/Kconfig
> +++ b/fs/btrfs/Kconfig
> @@ -2,6 +2,7 @@
>  
>  config BTRFS_FS
>  	tristate "Btrfs filesystem support"
> +	select LIBCRC32C
>  	select CRYPTO
>  	select CRYPTO_CRC32C
>  	select ZLIB_INFLATE
> -- 
> 2.7.4
>