On Wed, 2015-12-02 at 15:12 +0300, Denis Kirjanov wrote:
> On 11/20/15, Chenhui Zhao <chenhui.z...@freescale.com> wrote:
> > On e6500, in the case of cpu hotplug, either thread in one core
> > may be the first thread initilzing the TLB1. The subsequent threads
> > must not setup it again.
> >
> > The code is derived from the comment of Scott Wood.
> >
> > Signed-off-by: Chenhui Zhao <chenhui.z...@freescale.com>
> > ---
> > arch/powerpc/include/asm/cputhreads.h | 7 +++++++
> > arch/powerpc/mm/tlb_nohash.c | 4 +---
> > 2 files changed, 8 insertions(+), 3 deletions(-)
> >
> > diff --git a/arch/powerpc/include/asm/cputhreads.h
> > b/arch/powerpc/include/asm/cputhreads.h
> > index ba42e46..b56cece 100644
> > --- a/arch/powerpc/include/asm/cputhreads.h
> > +++ b/arch/powerpc/include/asm/cputhreads.h
> > @@ -94,6 +94,13 @@ static inline int cpu_last_thread_sibling(int cpu)
> > return cpu | (threads_per_core - 1);
> > }
> >
> > +static inline u32 get_tensr(void)
> > +{
> > + if (cpu_has_feature(CPU_FTR_SMT))
> > + return mfspr(SPRN_TENSR);
> > + else
> > + return 1;
> > +}
> If i get it right, SPRN_TENSR used in the code only if CONFIG_PPC64
> is defined. Then we can make it noop on ppc32.
Please don't. It accomplishes nothing other than adding an obstacle to
supporting this on ppc32.
-Scott
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