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Linux next-20170407 failed to build on ARM due to usage of mod in btrfs code

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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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Linux next-20170407 failed to build on ARM due to usage of mod in  btrfs code Icenowy Zheng <icenowy@aosc.io> - 2017-04-08 18:10 +0200
  Re: Linux next-20170407 failed to build on ARM due to usage of mod in  btrfs code Fabio Estevam <festevam@gmail.com> - 2017-04-08 19:50 +0200
    Re: Linux next-20170407 failed to build on ARM due to usage of mod  in btrfs code Adam Borowski <kilobyte@angband.pl> - 2017-04-08 20:40 +0200
    [PATCH] btrfs: scrub: use do_div() for 64-by-32 division Adam Borowski <kilobyte@angband.pl> - 2017-04-08 23:10 +0200
      Re: [PATCH] btrfs: scrub: use do_div() for 64-by-32 division Adam Borowski <kilobyte@angband.pl> - 2017-04-09 06:10 +0200
        Re: [PATCH] btrfs: scrub: use do_div() for 64-by-32 division Adam Borowski <kilobyte@angband.pl> - 2017-04-10 03:20 +0200
      Re: [PATCH] btrfs: scrub: use do_div() for 64-by-32 division David Sterba <dsterba@suse.cz> - 2017-04-10 13:20 +0200
      Re: [PATCH] btrfs: scrub: use do_div() for 64-by-32 division "Austin S. Hemmelgarn" <ahferroin7@gmail.com> - 2017-04-10 15:00 +0200

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