[Devel] [PATCH vz10 31/32] ext4: select LIBCRC32C

[Konstantin Khorenko]

ext4 computes its metadata checksums with crc32c().  Upstream that helper
moved into lib/crc32.c under CONFIG_CRC32, which is what ext4 selects, but
this tree still has the older layout where it lives in lib/libcrc32c.c
under CONFIG_LIBCRC32C - the RHEL10.2 base carries the ext4 side of the
conversion and not the lib one.  So a kernel with ext4 built in and
nothing else pulling libcrc32c in does not link:

  ld: vmlinux.o: in function 'ext4_inode_bitmap_csum_verify':
      undefined reference to 'crc32c'

Our configs get away with it because other filesystems select
CONFIG_LIBCRC32C; plain x86_64 defconfig, which we now want to keep
building, does not.  Select it explicitly until the lib side is caught up
with upstream, where this select becomes redundant rather than wrong.

Fixes: 9f055df11343 ("rh10: import RHEL10 kernel-6.12.0-211.16.1.el10")
Feature: fix ms/ext4
https://virtuozzo.atlassian.net/browse/VSTOR-134732
Signed-off-by: Konstantin Khorenko <khorenko at virtuozzo.com>
---
 fs/ext4/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/ext4/Kconfig b/fs/ext4/Kconfig
index c9ca41d91a6c..8849d297102d 100644
--- a/fs/ext4/Kconfig
+++ b/fs/ext4/Kconfig
@@ -32,6 +32,7 @@ config EXT4_FS
 	select JBD2
 	select CRC16
 	select CRC32
+	select LIBCRC32C
 	select FS_IOMAP
 	select FS_ENCRYPTION_ALGS if FS_ENCRYPTION
 	help
-- 
2.47.1