On 2021/1/27 下午8:01, David Sterba wrote:

On Wed, Jan 27, 2021 at 10:42:30AM +0100, matthias.bgg@kernel.org wrote:

quoted

From: Matthias Brugger <mbrugger@suse.com>

Since commit 565a4147d17a ("fs: btrfs: Add more checksum algorithms")
btrfs uses the sha256 checksum algorithm. But Kconfig lacks to select
it. This leads to compilation errors:
fs/built-in.o: In function `hash_sha256':
fs/btrfs/crypto/hash.c:25: undefined reference to `sha256_starts'
fs/btrfs/crypto/hash.c:26: undefined reference to `sha256_update'
fs/btrfs/crypto/hash.c:27: undefined reference to `sha256_finish'

Signed-off-by: Matthias Brugger <mbrugger@suse.com>

So this is a fix for u-boot, got me confused and not for the first time
as there's Kconfig and the same fs/btrfs/ directory structure.

Well, sometimes too unified file structure/code base can also be a problem.

Considering I'm also going to continue cross-porting more code to 
U-boot, any recommendation on this?
Using different prefix?

Thanks,
Qu