linux-kernel - Re: [net-next][PATCH] RDS: keep data type consistent in the user visible header

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Message-ID: <0437debe-fd44-20ab-c2d2-02c14255da9a@solarflare.com>
Date:   Tue, 21 Feb 2017 14:58:49 +0000
From:   Edward Cree <ecree@...arflare.com>
To:     David Laight <David.Laight@...LAB.COM>,
        'David Miller' <davem@...emloft.net>,
        "sowmini.varadhan@...cle.com" <sowmini.varadhan@...cle.com>
CC:     "santosh.shilimkar@...cle.com" <santosh.shilimkar@...cle.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [net-next][PATCH] RDS: keep data type consistent in the user
 visible header

On 21/02/17 14:29, David Laight wrote:
>> The entire file should use the proper "__uX" kernel types
>> rather than the uint* ones.
> The uint* ones are part of the C standard :-)
>
> 	David
>
... which is exactly why we can't use them.

http://yarchive.net/comp/linux/kernel_headers.html#17

Visibility of <stdint.h> types is defined by a twisty maze of standards, all different (POSIX, SuS, BSD_SOURCE, XOPEN_SOURCE...).

__u8 and friends are in the reserved system namespace, so we can safely use them in user headers.

-Ed