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

[David Miller <davem@xxxxxxxxxxxxx>]

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.
--
To unsubscribe from this list: send the line "unsubscribe linux-hams" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html