linux-kernel - Re: [PATCH] lib/bug.c: use common WARN helper

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Message-ID: <20160223121421.GA4024@osiris>
Date:	Tue, 23 Feb 2016 13:14:21 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Josh Poimboeuf <jpoimboe@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Prarit Bhargava <prarit@...hat.com>
Subject: Re: [PATCH] lib/bug.c: use common WARN helper

On Mon, Feb 22, 2016 at 09:54:17PM -0600, Josh Poimboeuf wrote:
> The traceoff_on_warning option doesn't have any effect on s390, powerpc,
> arm64, parisc, and sh because there are two different types of WARN
> implementations:
> 
> 1) The above mentioned architectures treat WARN() as a special case of a
>    BUG() exception.  They handle warnings in report_bug() in lib/bug.c.
> 
> 2) All other architectures just call warn_slowpath_*() directly.  Their
>    warnings are handled in warn_slowpath_common() in kernel/panic.c.
> 
> Support traceoff_on_warning on all architectures and prevent any future
> divergence by using a single common function to emit the warning.
> 
> Also remove the '()' from '%pS()', because the parentheses look funky:
> 
>   [   45.607629] WARNING: at /root/warn_mod/warn_mod.c:17 .init_dummy+0x20/0x40 [warn_mod]()
> 
> Reported-by: Chunyu Hu <chuhu@...hat.com>
> Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
> ---
> Based on linux-next/master.
> 
>  include/asm-generic/bug.h |  7 +++++++
>  kernel/panic.c            | 44 +++++++++++++++++++++++++-------------------
>  lib/bug.c                 | 27 +++------------------------
>  3 files changed, 35 insertions(+), 43 deletions(-)

Nice! Just tested this on s390.

Acked-by: Heiko Carstens <heiko.carstens@...ibm.com>