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Subject: Re: [PATCH v3 12/26] compat_ioctl: move more drivers to
 compat_ptr_ioctl
To:     Arnd Bergmann <arnd@arndb.de>
References: <20190416202013.4034148-1-arnd@arndb.de>
 <20190416202701.127745-1-arnd@arndb.de>
Cc:     LKML <linux-kernel@vger.kernel.org>
From:   Marc Gonzalez <marc.w.gonzalez@free.fr>
Message-ID: <fa7d0939-8671-cb6b-efc8-dc48d75e8a52@free.fr>
Date:   Wed, 17 Apr 2019 11:46:46 +0200
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On 16/04/2019 22:25, Arnd Bergmann wrote:

> The .ioctl and .compat_ioctl file operations have the same prototype so
> they can both point to the same function, which works great almost all
> the time when all the commands are compatible.
> 
> One exception is the s390 architecture, where a compat pointer is only
> 31 bit wide, and converting it into a 64-bit pointer requires calling
> compat_ptr(). Most drivers here will ever run in s390

"will /never/ run" ?