linux-kernel - Re: [PATCH] iomap: hide iomap_sector with CONFIG

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Message-ID: <20190718130835.GA28520@lst.de>
Date:   Thu, 18 Jul 2019 15:08:35 +0200
From:   Christoph Hellwig <hch@....de>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Christoph Hellwig <hch@....de>,
        Christoph Hellwig <hch@...radead.org>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        linux-xfs <linux-xfs@...r.kernel.org>,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
        Andreas Gruenbacher <agruenba@...hat.com>,
        Hannes Reinecke <hare@...e.com>,
        Souptick Joarder <jrdr.linux@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Jani Nikula <jani.nikula@...el.com>
Subject: Re: [PATCH] iomap: hide iomap_sector with CONFIG_BLOCK=n

On Thu, Jul 18, 2019 at 03:03:15PM +0200, Arnd Bergmann wrote:
> The inclusion comes from the recently added header check in commit
> c93a0368aaa2 ("kbuild: do not create wrappers for header-test-y").
> 
> This just tries to include every header by itself to see if there are build
> failures from missing indirect includes. We probably don't want to
> add an exception for iomap.h there.

I very much disagree with that check.  We don't need to make every
header compilable with a setup where it should not be included.

That being said if you feel this is worth fixing I'd rather define
SECTOR_SIZE/SECTOR_SHIFT unconditionally.