From: Bernard Pidoux <bpidoux@free.fr>
To: David Miller <davem@davemloft.net>
Cc: ralf@linux-mips.org, linux-hams@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH] ax25.h unsigned long type for ax25 timers
Date: Fri, 20 Jun 2008 00:38:23 +0200 [thread overview]
Message-ID: <485ADFDF.1070509@free.fr> (raw)
In-Reply-To: <20080619.144621.120746379.davem@davemloft.net>
David,
Your explanation is perfectly clear and I understand the problem now.
Thank you very much for taking the time to explain me that.
Bernard Pidoux
David Miller wrote:
> From: Bernard Pidoux <bpidoux@free.fr>
> Date: Thu, 19 Jun 2008 18:28:46 +0200
>
>> Unfortunately I don't quite understand exactly why a structure in user
>> space cannot be changed.
>
> Because there are userland binaries already compiled out there using
> the current structure layout. If we change the kernel, those binaries
> stop using a datastructure that matches what the kernel is using.
> Such binaries will break.
>
> In generic, because of this, you can never change the layout of a
> data structure exported to userland as a kernel interface.
>
>
next prev parent reply other threads:[~2008-06-19 22:38 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-17 13:04 [PATCH] ax25.h unsigned long type for ax25 timers Bernard Pidoux
2008-06-18 5:30 ` David Miller
2008-06-19 16:28 ` Bernard Pidoux
2008-06-19 21:46 ` David Miller
2008-06-19 22:38 ` Bernard Pidoux [this message]
2008-06-20 13:17 ` Bernard Pidoux F6BVP
2008-06-28 2:33 ` David Miller
2008-06-19 19:38 ` Al
2008-06-19 20:35 ` Al
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