linux-kernel - next-20210511 - btrfs build failure on arm

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Date:   Tue, 11 May 2021 14:08:02 -0400
From:   "Valdis Klētnieks" <valdis.kletnieks@...edu>
To:     Qu Wenruo <wqu@...e.com>, David Sterba <dsterba@...e.com>
cc:     linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>
Subject: next-20210511 - btrfs build failure on arm

An arm allmodconfig build died with:

ERROR: modpost: "__aeabi_uldivmod" [fs/btrfs/btrfs.ko] undefined!

Some digging around with nm and looking at the assembler points at:

@ /usr/src/linux-next/fs/btrfs/extent_io.c:2676:        const int nr_bits = (end + 1 - start) / fs_info->sectorsize_bits;
        adds    r1, r1, #1      @, tmp552, 
        adc     r0, r0, #0      @, tmp551, 
        ldr     r3, [r5, #1576] @ tmp2, _47->sectorsize_bits
        bl      __aeabi_uldivmod                @       

Introduced by this commit:

commit 6512659d8f13015dccfb38a13c6d117d22572019
Author: Qu Wenruo <wqu@...e.com>
Date:   Mon May 3 10:08:55 2021 +0800

    btrfs: submit read time repair only for each corrupted sector

Looks like that line could use something from include/linux/math.h