linux-kernel - sparse_irq: userspace ABI breakage in -tip tree

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Date:	Fri, 19 Sep 2008 15:53:21 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...e.hu, Yinghai Lu <Yinghai.Lu@....COM>
Subject: sparse_irq: userspace ABI breakage in -tip tree


commit 70426a06a58561c401e64c5767d71a011d4b978b
Author: Yinghai Lu <yhlu.kernel@...il.com>
Date:   Tue Aug 19 20:50:27 2008 -0700

    x86: make 32 bit to use sparse_irq

@@ -285,7 +303,7 @@ int show_interrupts(struct seq_file *p, void *v)
                action = desc->action;
                if (!action && !any_count)
                        goto skip;
-               seq_printf(p, "%3d: ",i);
+               seq_printf(p, "%#x: ",i);
 #ifndef CONFIG_SMP
                seq_printf(p, "%10u ", kstat_irqs(i));
 #else


this is a userspace ABI breakage; you're changing /proc/interrupts from
decimal to hex! This file is used by both humans and computer programs,
and the humans will get confused, but the computer programs will break.
Not a good idea to put into mainline.

(I'm not so convinced of sparse_irq as a whole to be honest, but that's
a different story)
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