[RFC PATCH 3/3] ARM: pxa/pj4: Port problematic pj4 support code to v7/Thumb-2

[Arnd Bergmann]

On Wednesday 07 September 2011 09:18:15 Eric Miao wrote:
> > diff --git a/arch/arm/kernel/pj4-cp0.c b/arch/arm/kernel/pj4-cp0.c
> > index a4b1b07..5117d9d 100644
> > --- a/arch/arm/kernel/pj4-cp0.c
> > +++ b/arch/arm/kernel/pj4-cp0.c
> > @@ -66,9 +66,13 @@ static void __init pj4_cp_access_write(u32 value)
> >
> >        __asm__ __volatile__ (
> >                "mcr    p15, 0, %1, c1, c0, 2\n\t"
> > +#ifdef __LINUX_ARM_ARCH__ >= 7
> > +               "isb\n\t"
> > +#else
> >                "mrc    p15, 0, %0, c1, c0, 2\n\t"
> >                "mov    %0, %0\n\t"
> >                "sub    pc, pc, #4\n\t"
> > +#endif
> 
> Haojian,
> 
> Could you check internally if isb() will work here as PJ4 is both v6/v7
> compatible, and if it's in v7 mode, I guess isb() can be safely used here?

I thought we only support pj4 in v7 mode in Linux anyway.

	Arnd