linux-kernel - Re: [PATCH 03/44 take 2] [UBI] user-space API header

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Date:	Tue, 20 Feb 2007 15:07:13 +0200
From:	Artem Bityutskiy <dedekind@...radead.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>,
	Frank Haverkamp <haver@...t.ibm.com>,
	Josh Boyer <jwboyer@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH 03/44 take 2] [UBI] user-space API header

On Sat, 2007-02-17 at 22:27 +0100, Arnd Bergmann wrote:
> On Saturday 17 February 2007 17:54, Artem Bityutskiy wrote:
> > +struct ubi_mkvol_req {
> > +       int32_t vol_id;
> > +       int32_t alignment;
> > +       int64_t bytes;
> > +       int8_t vol_type;
> > +       int8_t padding[9];
> > +       int16_t name_len;
> > +       __user const char *name;
> > +} __attribute__ ((packed));
> 
> This structure is not suitable for an ioctl call, because it has
> incompatible layout between 32 and 64 bit processes. The easiest
> fix for this would be to change the 'name' field to an array
> instead of a pointer.

Will be fixed thanks. Just out of curiosity, could you please provide an
example when this may be a problem.

Artem.

-- 
Best regards,
Artem Bityutskiy (Битюцкий Артём)

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