[PATCH 4/5] ARMv6K and ARMv7 use fault statuses 3 and 6 as Access Flag fault

[Kirill A. Shutemov]

On Mon, Jul 19, 2010 at 02:11:32PM +0400, Sergei Shtylyov wrote:
> Hello.
> 
> Kirill A. Shutsemov wrote:
> 
> > Statuses 3 (0b00011) and 6 (0x00110) of DFSR are Access Flags faults on
> > ARMv6K and ARMv7. Let's patch fsr_info[] at runtime if we are on ARMv7
> > or later.
> 
> > Unfortunately, we don't have runtime check for 'K' extension, so we
> > can't check for it.
> 
> > Signed-off-by: Kirill A. Shutemov <kirill at shutemov.name>
> [...]
> > diff --git a/arch/arm/mm/alignment.c b/arch/arm/mm/alignment.c
> > index 77cfdbe..d073b64 100644
> > --- a/arch/arm/mm/alignment.c
> > +++ b/arch/arm/mm/alignment.c
> > @@ -926,8 +926,18 @@ static int __init alignment_init(void)
> >  
> >  	hook_fault_code(1, do_alignment, SIGBUS, BUS_ADRALN,
> >  			"alignment exception");
> > -	hook_fault_code(3, do_alignment, SIGBUS, BUS_ADRALN,
> > -			"alignment exception");
> > +
> > +	/*
> > +	 * ARMv6K and ARMv7 use fault status 3 (0b00011) as Access Flag section
> > +	 * fault, not as alignment error.
> > +	 *
> > +	 * TODO: handle ARMv6K properly. Runtime check for 'K' extension is
> > +	 * needed.
> > +	 */
> > +	if (cpu_architecture() <= CPU_ARCH_ARMv6) {
> > +		hook_fault_code(3, do_alignment, SIGBUS, BUS_ADRALN,
> > +				"alignment exception");
> > +	}
> 
>     Curly braces not neeed here. I assume you haven't run your patch thru 
> scripts/checkpatch.pl?

total: 0 errors, 0 warnings, 37 lines checked

I'll remove it if you want. But I think it reasonable to leave braces in
cases like:

if (condition) {
	do_this(a, very_long, list, of, parameters,
		second, part, of, the, list);
}

What do you think?

-- 
 Kirill A. Shutemov