Hello everyone,
Today I tried to build a kernel with btrfs enabled on ARM, then when
linking I met such an error:
```
fs/built-in.o: In function `scrub_bio_end_io_worker':
acl.c:(.text+0x2f0450): undefined reference to `__aeabi_uldivmod'
fs/built-in.o: In function `scrub_extent_for_parity':
acl.c:(.text+0x2f0bcc): undefined reference to `__aeabi_uldivmod'
fs/built-in.o: In function `scrub_raid56_parity':
acl.c:(.text+0x2f12a8): undefined reference to `__aeabi_uldivmod'
acl.c:(.text+0x2f15c4): undefined reference to `__aeabi_uldivmod'
```
These functions are found at fs/btrfs/scrub.c .
After disabling btrfs the kernel is successfully built.
For this problem, see also [1], which used to be a similar bug in PL330
driver code.
[1] https://patchwork.kernel.org/patch/5299081/
Thanks,
Icenowy
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