linux-kernel - Re: Behavior of BUG() [Was: Re: [PATCH 2/5] of/fdt: add kernel command line option for dtb

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Message-ID: <AANLkTimrR7DEsgtG=+fJzvdaiKQA-kj8KWU5i2qDWK8Q@mail.gmail.com>
Date:	Tue, 16 Nov 2010 23:20:59 -0500
From:	Arnaud Lacombe <lacombar@...il.com>
To:	Matt Mackall <mpm@...enic.com>
Cc:	linux-kernel@...r.kernel.org, dirk.brandewie@...il.com,
	linux-arch@...r.kernel.org, linux-kbuild@...r.kernel.org,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: Behavior of BUG() [Was: Re: [PATCH 2/5] of/fdt: add kernel
 command line option for dtb_compat string]

Hi,

On Tue, Nov 16, 2010 at 11:07 PM, Matt Mackall <mpm@...enic.com> wrote:
> On Tue, 2010-11-16 at 22:45 -0500, Arnaud Lacombe wrote:
>> Hi,
>>
>> [CC: list reduced as starting a new thread, most on the context
>> removed as this concern a different issue.]
>>
>> On Tue, Nov 16, 2010 at 7:16 PM, Grant Likely <grant.likely@...retlab.ca> wrote:
>> > On Tue, Nov 16, 2010 at 3:41 PM,  <dirk.brandewie@...il.com> wrote:
>> >> From: Dirk Brandewie <dirk.brandewie@...il.com>
>> >> [...]
>> > The kernel needs to complain *loudly* if this occurs because it
>> > represents a bug.  I'm tempted to say use BUG, but that would halt the
>> > kernel and prevent any possibility of kernel log output.
>> > [...]
>> does it ? if CONFIG_BUG is not enabled and the arch has no define for
>> it, the default does _nothing_:
>
> That's because CONFIG_BUG=N is intended for machines where logging is
> irrelevant/impossible.
>
Yes, but it is still a no-op, where the original programmer made it
clear he did not want the kernel to go further.

> You are encouraged to ignore all options under
> CONFIG_EMBEDDED when trying to have a sensible discussion.
>
Unless it creates a situation where it does the opposite of what the
intended behavior, I would guess.

 - Arnaud
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