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

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On Sat, Apr 8, 2017 at 1:02 PM, Icenowy Zheng <icenowy@aosc.io> wrote:
> 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.

I see the same error with ARM imx_v6_v7_defconfig + btrfs support.

Looks like it is caused by commit 7d0ef8b4dbbd220 ("Btrfs: update
scrub_parity to use u64 stripe_len").

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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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