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Date:   Mon, 11 Dec 2017 00:24:36 -0500
From:   Mike Snitzer <>
To:     Stephen Rothwell <>
Cc:     Alasdair G Kergon <>,
        Linux-Next Mailing List <>,
        Linux Kernel Mailing List <>
Subject: Re: linux-next: build warning after merge of the device-mapper tree

On Sun, Dec 10 2017 at  9:05pm -0500,
Stephen Rothwell <> wrote:

> Hi all,
> After merging the device-mapper tree, today's linux-next build (powerp
> ppc64_defconfig) produced this warning:
> drivers/md/dm.c: In function '__send_changing_extent_only':
> drivers/md/dm.c:1365:45: warning: 'ti' may be used uninitialized in this function [-Wmaybe-uninitialized]
>   num_bios = get_num_bios ? get_num_bios(ti) : 0;
>                                              ^
> Introduced by commit
>   aecefd4919de ("dm: fix __send_changing_extent_only() to send first bio and chain remainder")
> This looks particularly bad :-(

I worked all weekend on DM code and compiled dm.c probably 30 times,
pretty bizarre that the RHEL7 gcc compiler isn't spewing anything about

Anyway, I just fixed it via rebase (new commit is


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