linux-kernel - Re: [PATCH 08/28] nios2: MMU Fault handling

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Date:	Thu, 24 Apr 2014 14:42:49 +0800
From:	Ley Foon Tan <lftan@...era.com>
To:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
Cc:	Linux-Arch <linux-arch@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	cltang@...esourcery.com
Subject: Re: [PATCH 08/28] nios2: MMU Fault handling

On Tue, Apr 22, 2014 at 10:30 PM, Ezequiel Garcia
<ezequiel.garcia@...e-electrons.com> wrote:
> Hello Ley Foon,
>
> On Apr 18, Ley Foon Tan wrote:
>> +
>> +bad_area_nosemaphore:
>> +     /* User mode accesses just cause a SIGSEGV */
>> +     if (user_mode(regs)) {
>
> I found that it's useful to add some printing here, just as ARM
> does. I carry this patch on my kernel:
>
> +               printk(KERN_INFO "%s: unhandled page fault (%d) at 0x%08lx, cause %ld\n",
> +                      current->comm, SIGSEGV, address, cause);
> +               show_regs(regs);
>
> Do you think we could do something like it? Maybe with a compile time option?
Yes, this is useful debug message. I can add this.
Prefer not to add new compile time option, I think this shouldn't
happen frequently.
>
>> +             _exception(SIGSEGV, regs, code, address);
>> +             return;
>> +     }
>> +
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