Re: [PATCH] ARM: Fix null die() string for unhandled data and prefetch abort cases - Russell King

From: Russell King - ARM Linux admin <linux@armlinux.org.uk>
To: "George G. Davis" <george_davis@mentor.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>,
	Allison Randal <allison@lohutok.net>,
	open list <linux-kernel@vger.kernel.org>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	"moderated list:ARM PORT" <linux-arm-kernel@lists.infradead.org>,
	Souptick Joarder <jrdr.linux@gmail.com>
Subject: Re: [PATCH] ARM: Fix null die() string for unhandled data and prefetch abort cases
Date: Sat, 20 Jul 2019 13:30:23 +0100	[thread overview]
Message-ID: <20190720123023.GA1330@shell.armlinux.org.uk> (raw)
In-Reply-To: <1563589976-19004-1-git-send-email-george_davis@mentor.com>

On Fri, Jul 19, 2019 at 10:32:55PM -0400, George G. Davis wrote:
> When an unhandled data or prefetch abort occurs, the die() string
> is empty resulting in backtrace messages similar to the following:
> 
> 	Internal error: : 1 [#1] PREEMPT SMP ARM
> 
> Replace the null string with the name of the abort handler in order
> to provide more meaningful hints as to the cause of the fault.

NAK.

We already print the cause of the abort earlier in the dump, and we've
also added a "cut here" marker to help people include all the necessary
information when reporting a problem.

It's unfortunate that we have the additional colon in the oops dump,
but repeating the information that we've printed on one of the previous
two lines is really not necessary.

> 
> Signed-off-by: George G. Davis <george_davis@mentor.com>
> ---
>  arch/arm/mm/fault.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
> index 0048eadd0681..dddea0a21220 100644
> --- a/arch/arm/mm/fault.c
> +++ b/arch/arm/mm/fault.c
> @@ -557,7 +557,7 @@ do_DataAbort(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
>  		inf->name, fsr, addr);
>  	show_pte(current->mm, addr);
>  
> -	arm_notify_die("", regs, inf->sig, inf->code, (void __user *)addr,
> +	arm_notify_die(inf->name, regs, inf->sig, inf->code, (void __user *)addr,
>  		       fsr, 0);
>  }
>  
> @@ -585,7 +585,7 @@ do_PrefetchAbort(unsigned long addr, unsigned int ifsr, struct pt_regs *regs)
>  	pr_alert("Unhandled prefetch abort: %s (0x%03x) at 0x%08lx\n",
>  		inf->name, ifsr, addr);
>  
> -	arm_notify_die("", regs, inf->sig, inf->code, (void __user *)addr,
> +	arm_notify_die(inf->name, regs, inf->sig, inf->code, (void __user *)addr,
>  		       ifsr, 0);
>  }
>  
> -- 
> 2.7.4
> 
> 

-- 
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