From: Andi Kleen <andi@firstfloor•org>
To: Andrew Morton <akpm@linux-foundation•org>
Cc: randy.dunlap@oracle•com, lenb@kernel•org,
linux-acpi@vger•kernel.org, linux-next@vger•kernel.org
Subject: Re: [PATCH -next] acpi utmisc: use WARN_ON() instead of warn_on_slowpath()
Date: Wed, 02 Jul 2008 21:31:17 +0200 [thread overview]
Message-ID: <486BD785.5050207@firstfloor.org> (raw)
In-Reply-To: <20080702121424.a3451eae.akpm@linux-foundation.org>
Andrew Morton wrote:
> On Wed, 02 Jul 2008 20:50:04 +0200
> Andi Kleen <andi@firstfloor•org> wrote:
>
>> Randy Dunlap wrote:
>>> From: Randy Dunlap <randy.dunlap@oracle•com>
>>>
>>> utmisc.c needs to include asm-generic/bug.h for warn()/WARN() functions,
>>> but it should use WARN_ON() instead of warn_on_slowpath() since
>>> arches can provide their own implementation of WARN_ON(), which does
>>> not have to use/provide/implement warn_on_slowpath() at all.
>>> Just use the front door (WARN_ON).
>>>
>>> linux-next-20080702/drivers/acpi/utilities/utmisc.c:1027: error: implicit declaration of function 'warn_on_slowpath'
>> On what architecture did you see that?
>
> Doesn't matter.
>
> x86, I expect. warn_on_slowpath() isn't implemented if CONFIG_BUG=n.
> warn_on_slowpath() is an internal implementation detail of the generic
> version of the WARN facility. No other code has any business using it.
>
>> It might be be better to just provide it on all architectures supported
>> by ACPI (x86, ia64). I suppose it was ia64?
>
> Let's use the proper interfaces. WARN_ON().
The problem I see here is that they are not necessarily equivalent.
In particular the function here is just a generic low level error
reporting function, but you really want to report the caller.
And that's a genuine wish. With your patch it would always
report the same function and only differ in the (potentially
unreliable) backtrace.
I think it would be better to provide a warn_on_slowpath() for
the !CONFIG_BUG case and drop this patch.
Not-Acked: ...
-Andi
next prev parent reply other threads:[~2008-07-02 19:31 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20080701103339.b5acc1f3.randy.dunlap@oracle.com>
[not found] ` <20080701131714.5093fa49.akpm@linux-foundation.org>
[not found] ` <23433248.1214943818230.JavaMail.oracle@acsmt302.oracle.com>
[not found] ` <20080701133535.f92a673c.akpm@linux-foundation.org>
2008-07-02 18:28 ` [PATCH -next] acpi utmisc: use WARN_ON() instead of warn_on_slowpath() Randy Dunlap
2008-07-02 18:50 ` Andi Kleen
2008-07-02 19:14 ` Andrew Morton
2008-07-02 19:31 ` Andi Kleen [this message]
2008-07-02 19:43 ` Andrew Morton
2008-07-02 20:11 ` Andi Kleen
2008-07-02 20:35 ` Andrew Morton
2008-07-02 20:51 ` Andi Kleen
2008-07-02 21:02 ` Andrew Morton
2008-07-02 21:07 ` Andi Kleen
2008-07-02 21:14 ` Andrew Morton
2008-07-06 17:18 ` Len Brown
2008-07-06 18:13 ` Andi Kleen
2008-07-06 18:52 ` Arjan van de Ven
2008-07-07 6:19 ` Andi Kleen
2008-07-07 7:03 ` Arjan van de Ven
2008-07-08 15:44 ` Thomas Renninger
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