linux-kernel - Re: [PATCH 15/45] dm-log-userspace.h: include stdint.h in userspace

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Message-ID: <2286739.alIuOL4vnt@wuerfel>
Date:	Tue, 17 Feb 2015 14:55:49 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Alasdair G Kergon <agk@...hat.com>
Cc:	Mikko Rapeli <mikko.rapeli@....fi>, linux-kernel@...r.kernel.org,
	Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
	linux-api@...r.kernel.org
Subject: Re: [PATCH 15/45] dm-log-userspace.h: include stdint.h in userspace

On Tuesday 17 February 2015 13:38:06 Alasdair G Kergon wrote:
> On Tue, Feb 17, 2015 at 10:08:56AM +0100, Arnd Bergmann wrote:
> > The normal way to do this in kernel headers is to use linux/types.h
> > but change the data structures to use __u64 instead of uint64_t
> > to avoid the build error.
>  
> That's what happened to dm-ioctl.h.

Ah, indeed. It turns out that it was my own change that did this:


commit 9adfbfb611307060db54691bc7e6d53fdc12312b
Author: Arnd Bergmann <arnd@...db.de>
Date:   Thu Feb 26 00:51:40 2009 +0100

    make most exported headers use strict integer types
    
    This takes care of all files that have only a small number
    of non-strict integer type uses.

> (Or someone could adjust linux/types.h to include these as standard.)

No, that wouldn't work. The C user space headers are not meant to
be included implicitly by any standard headers, which might pull
in linux/types.h implicitly.

I think it would be best to change all patches in the new series
in the same way for consistency and try to avoid using stdint.h
as much as we can.

	Arnd
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