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

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Date:	Mon, 22 Jun 2009 08:23:38 +0200
From:	Marco Stornelli <marco.stornelli@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
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

2009/6/21 Arnd Bergmann <arnd@...db.de>:
> 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.

It's not possible to create an "image" with pramfs, it's like tmpfs.

> 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 <><
>

Yes, indeed the most important thing is to be sure that a 64bit kernel
works well. I'll try to test it in this environment. If there are
"64bit guys" to help me to test it, it'd be great.

Marco
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