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

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Message-ID: <CAMuHMdXMbGS6xFyW80Cv1xOSF=e76G16vVrboQUkgC7Q_mgZtw@mail.gmail.com>
Date:	Thu, 24 Apr 2014 09:18:25 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
Cc:	Ley Foon Tan <lftan@...era.com>,
	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>,
	LeyFoon Tan <lftan.linux@...il.com>, cltang@...esourcery.com,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 08/28] nios2: MMU Fault handling

On Tue, Apr 22, 2014 at 4:30 PM, Ezequiel Garcia
<ezequiel.garcia@...e-electrons.com> wrote:
> 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?

Can this easily be triggered from userspace? If yes, please use
pr_info_ratelimited().

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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