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

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Message-ID: <20190717141029.GE20977@twin.jikos.cz>
Date:   Wed, 17 Jul 2019 16:10:29 +0200
From:   David Sterba <dsterba@...e.cz>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
        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.
> 
> 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>

We already got another fix that is scheduled for post rc1 pull request.