linux-kernel - Re: [PATCH v6 1/8] x86: allow to handle errors in text

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Message-ID: <20140121090229.5936c2ba@gandalf.local.home>
Date:	Tue, 21 Jan 2014 09:02:29 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Petr Mladek <pmladek@...e.cz>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Jiri Kosina <jkosina@...e.cz>, linux-kernel@...r.kernel.org,
	x86@...nel.org
Subject: Re: [PATCH v6 1/8] x86: allow to handle errors in text_poke
 function family

On Tue, 21 Jan 2014 14:00:37 +0100
Petr Mladek <pmladek@...e.cz> wrote:

> > > There are some situations where it is hard to recover from an error. Masami
> > > Hiramatsu <masami.hiramatsu.pt@...achi.com> suggested to create
> > > text_poke*_or_die() variants for this purpose.
> > 
> > I don't like the "_or_die()". Although I don't care much about it, I'm
> > thinking the x86 maintainers might not like it either.
> > 
> > What about just doing the test in the places that would call "or_die"?
> > 
> > 	ret = text_poke*();
> > 	BUG_ON(ret);
> 
> Exactly this solution has been used in v5 of this patch set, see 
> https://lkml.org/lkml/2013/12/3/258
> 
> Masami suggested to use the "or_die()" because BUG_ON() was used on most
> locations, see https://lkml.org/lkml/2013/12/6/1107

If BUG_ON() is used in most locations, then we can make text_poke()
default to bug, and the just have a text_poke_safe() function that does
not bug. Or some similar name.

The "_die" has a bad taste in several developers mouth ;-)

-- Steve
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