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

Bernard Pidoux <bpidoux@xxxxxxx> · Fri, 20 Jun 2008 00:38:23 +0200

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@xxxxxxx>
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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