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

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Message-ID: <20080919174447.2dd3015a@infradead.org>
Date:	Fri, 19 Sep 2008 17:44:47 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	"Yinghai Lu" <yhlu.kernel@...il.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu
Subject: Re: sparse_irq: userspace ABI breakage in -tip tree

On Fri, 19 Sep 2008 17:10:42 -0700
"Yinghai Lu" <yhlu.kernel@...il.com> wrote:

> On Fri, Sep 19, 2008 at 3:53 PM, Arjan van de Ven
> <arjan@...radead.org> wrote:
> >
> > 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.
> 
> change back to decimal could help?

that's a minimum; someone (you?) needs to check if there are other
things changed in the format of this file....



-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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