netdev - Re: [PATCH] ax25.h unsigned long type for ax25 timers

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Message-Id: <20080619.144621.120746379.davem@davemloft.net>
Date:	Thu, 19 Jun 2008 14:46:21 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	bpidoux@...e.fr
Cc:	ralf@...ux-mips.org, linux-hams@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] ax25.h unsigned long type for ax25 timers

From: Bernard Pidoux <bpidoux@...e.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.
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