linux-kernel - Re: [PATCH linux-next] device-dax: fix BLOCK dependency

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Message-ID: <CAPcyv4ibrvQSMC69VXrsTz3B6VechPQQ2VEuYo7+W89EP9yhQA@mail.gmail.com>
Date:   Sat, 13 May 2017 16:21:39 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Fabian Frederick <fabf@...net.be>
Cc:     Johannes Thumshirn <jthumshirn@...e.de>,
        Arnd Bergmann <arnd@...db.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH linux-next] device-dax: fix BLOCK dependency

On Sat, May 13, 2017 at 11:59 AM, Fabian Frederick <fabf@...net.be> wrote:
> commit ef51042472f5 ("block, dax: move "select DAX" from BLOCK to FS_DAX")
> uses get_start_sect() which requires CONFIG_BLOCK
>
> make allnoconfig + dax gives the following:
>
> drivers/dax/super.c: In function 'bdev_dax_pgoff':
> drivers/dax/super.c:50:26: error: implicit declaration of function
> 'get_start_sect' [-Werror=implicit-function-declaration]
>

Ah, sorry for this breakage, I guess this is a config that kbuild does
not attempt. I'll fix this up by not compiling the block-related
helpers in the BLOCK=n case.