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

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Message-ID: <20140424161804.GG1735@arch.cereza>
Date:	Thu, 24 Apr 2014 13:18:04 -0300
From:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
To:	Ley Foon Tan <lftan@...era.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 Apr 25, Ley Foon Tan wrote:
> On Thu, Apr 24, 2014 at 11:22 PM, Ezequiel Garcia
> <ezequiel.garcia@...e-electrons.com> wrote:
> >> > 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.
> >
> > No, it shouldn't happen frequently. You can take a look at what ARM does.
> > They use a DEBUG_USER compile-time option, much more complex than my silly
> > proposal.
> For now, we can print it always if this shouldn't happen frequently.
> Compile time option can be added later if we have more other debug
> stuff to print later.
> 

OK, sound sensible.
-- 
Ezequiel García, Free Electrons
Embedded Linux, Kernel and Android Engineering
http://free-electrons.com
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