linux-kernel - Re: [PATCH 06/14] Pramfs: Include files

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Message-Id: <200906212222.25434.arnd@arndb.de>
Date:	Sun, 21 Jun 2009 22:22:24 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Marco <marco.stornelli@...il.com>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	Linux Embedded <linux-embedded@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/14] Pramfs: Include files

On Sunday 21 June 2009, Marco wrote:
> I was thinking about your comment and I think I'll use __kernel_off_t
> for the exported headers. I know that it will differ between 32 and 64
> bit architectures, but for this kind of fs there isn't any compatibility
> problem at layout level. You cannot remove a chip of RAM from a board
> 32bit little endian and attach it to a board with a cpu 64bit big
> endian, the memory isn't a disk. Indeed, I see that tmpfs uses simply
> "unsigned long" in the exported header file without any problems to
> little or big endian.

It's still a problem. You might be creating a file system image
for an embedded board with a different endianess. Or even on the
same machine, you could be looking at the file system contents
with a 32 bit process running on a 64 bit kernel.

	Arnd <><
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