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

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Date:	Tue, 23 Feb 2016 08:13:46 -0500
From:	Prarit Bhargava <prarit@...hat.com>
To:	Josh Poimboeuf <jpoimboe@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: [PATCH] lib/bug.c: use common WARN helper



On 02/22/2016 10:54 PM, 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>

<snip>

> -
> -		print_modules();
> -		show_regs(regs);
> -		print_oops_end_marker();
> -		/* Just a warning, don't kill lockdep. */
> -		add_taint(BUG_GET_TAINT(bug), LOCKDEP_STILL_OK);
> +		__warn(file, line, (void *)bugaddr, BUG_GET_TAINT(bug), regs,
> +		       NULL);
> +

^^^ minor minor minor nit: extra line here.  Not a big deal but change it if
anyone else complains.

Other than that ...

Acked-and-tested-by: Prarit Bhargava <prarit@...hat.com>

P.

>  		return BUG_TRAP_TYPE_WARN;
>  	}
>  
>