linux-kernel - RE: [PATCH] bluetooth.h: __ variants of u8 and friends are not neccessary inside kernel

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6DB01E4056@AcuExch.aculab.com>
Date:   Thu, 6 Oct 2016 13:00:19 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Joe Perches' <joe@...ches.com>, Pavel Machek <pavel@....cz>
CC:     Marcel Holtmann <marcel@...tmann.org>,
        "trivial@...nel.org" <trivial@...nel.org>,
        "Gustavo F. Padovan" <gustavo@...ovan.org>,
        "Johan Hedberg" <johan.hedberg@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        "linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] bluetooth.h: __ variants of u8 and friends are not
 neccessary inside kernel

From: Joe Perches
> Sent: 06 October 2016 12:39
> On Thu, 2016-10-06 at 09:41 +0000, David Laight wrote:
> > From: Joe Perches
> > > No worries, and bool is the same ,size as u8.
> > That is not guaranteed at all.
> > One of the ARM ABI defined bool to be the size of int.
> 
> Really?  What kernel has sizeof(_Bool) != 1 ?

Probably none, but I know systems have used larger bool.
I found this:
> with egcs-2.90.29 980515 (egcs-1.0.3 release) on alphaev56-dec-osf4.0d

>  bool  = 8
>  short = 2
>  int   = 4 
>  long  = 8

I'm pretty sure something newer than an old alpha ABI used 4 byte bool.

	David