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Date:   Sat, 16 May 2020 12:07:03 -0700
From:   James Bottomley <James.Bottomley@...senPartnership.com>
To:     Valdis Klētnieks <valdis.kletnieks@...edu>,
        Hannes Reinecke <hare@...e.de>,
        Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>
Cc:     dm-devel@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [dm-devel] next-20200514 - build issue in
 drivers/md/dm-zoned-target.c

On Sat, 2020-05-16 at 07:19 -0400, Valdis Klētnieks wrote:
> Am seeing a build error in next-0514.  -0420 built OK.
> building a 'make allmodconfig' on a RPi4 in 32-bit mode.
> 
>   MODPOST 7575 modules
> ERROR: modpost: "__aeabi_uldivmod" [drivers/md/dm-zoned.ko]
> undefined!
> 
> objdump and 'make drivers/md/dm-zoned-target.s' tells
> me that the problem is in function dmz_fixup_devices(), near here:
> 
> @ drivers/md/dm-zoned-target.c:806:             reg_dev->nr_zones =
> DIV_ROUND_UP(reg_dev->capacity,
>         ldr     r0, [r6, #56]   @ reg_dev_166->capacity, reg_dev_166-
> >capacity
>         adds    r1, r3, r1      @ tmp316, _227, reg_dev_166->capacity
>         adc     r0, r2, r0      @ tmp315, _227, reg_dev_166->capacity
>         subs    r1, r1, #1      @, tmp316,
> @ drivers/md/dm-zoned-target.c:805:             reg_dev-
> >zone_nr_sectors = zoned_dev->zone_nr_sectors;
>         strd    r2, [r6, #80]   @, reg_dev,
> @ drivers/md/dm-zoned-target.c:806:             reg_dev->nr_zones =
> DIV_ROUND_UP(reg_dev->capacity,
>         sbc     r0, r0, #0      @, tmp315,
>         bl      __aeabi_uldivmod                @
> @ drivers/md/dm-zoned-target.c:806:             reg_dev->nr_zones =
> DIV_ROUND_UP(reg_dev->capacity,
>         str     r1, [r6, #64]   @ tmp306, reg_dev_166->nr_zones
> 
> git blame points at this commit:
> 
> commit 70978208ec91d798066f4c291bc98ff914bea222
> Author: Hannes Reinecke <hare@...e.de>
> Date:   Mon May 11 10:24:30 2020 +0200
> 
>     dm zoned: metadata version 2
> 
> Reverting that commit lets the build complete.

That's because the DIV_ROUND_UP in the patch should actually be
DIV_ROUND_UP_SECTOR_T I think.

James

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