Re: [Qemu-devel] [PATCH 1/4] ppc: simplify ppc_hash64_hpte_page_shift_noslb()

[David Gibson <david@gibson.dropbear.id.au>]

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On Mon, Jul 04, 2016 at 02:46:51PM +1000, David Gibson wrote:
> On Fri, Jul 01, 2016 at 09:10:10AM +0200, Cédric Le Goater wrote:
> > The segment page shift parameter is never used. Let's remove it.
> 
> I think I did have a use case for this in mind when I made it, but I
> can't remember what it was now.  Oh well, we can always add it back
> when I remember.  I'll apply this to ppc-for-2.7.

Actually.. no I won't.  There are some problems in the later patches
in this series, and to fix this correctly we're going to need that
slb_pshift return value after all.

> 
> > 
> > Signed-off-by: Cédric Le Goater <clg@kaod.org>
> > ---
> >  hw/ppc/spapr_hcall.c    | 4 ++--
> >  target-ppc/mmu-hash64.c | 6 +-----
> >  target-ppc/mmu-hash64.h | 3 +--
> >  3 files changed, 4 insertions(+), 9 deletions(-)
> > 
> > diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
> > index e011ed4b664b..73af112e1d36 100644
> > --- a/hw/ppc/spapr_hcall.c
> > +++ b/hw/ppc/spapr_hcall.c
> > @@ -83,12 +83,12 @@ static target_ulong h_enter(PowerPCCPU *cpu, sPAPRMachineState *spapr,
> >      target_ulong pte_index = args[1];
> >      target_ulong pteh = args[2];
> >      target_ulong ptel = args[3];
> > -    unsigned apshift, spshift;
> > +    unsigned apshift;
> >      target_ulong raddr;
> >      target_ulong index;
> >      uint64_t token;
> >  
> > -    apshift = ppc_hash64_hpte_page_shift_noslb(cpu, pteh, ptel, &spshift);
> > +    apshift = ppc_hash64_hpte_page_shift_noslb(cpu, pteh, ptel);
> >      if (!apshift) {
> >          /* Bad page size encoding */
> >          return H_PARAMETER;
> > diff --git a/target-ppc/mmu-hash64.c b/target-ppc/mmu-hash64.c
> > index fa26ad2e875b..7d056c1e3b4a 100644
> > --- a/target-ppc/mmu-hash64.c
> > +++ b/target-ppc/mmu-hash64.c
> > @@ -610,14 +610,12 @@ static unsigned hpte_page_shift(const struct ppc_one_seg_page_size *sps,
> >  }
> >  
> >  unsigned ppc_hash64_hpte_page_shift_noslb(PowerPCCPU *cpu,
> > -                                          uint64_t pte0, uint64_t pte1,
> > -                                          unsigned *seg_page_shift)
> > +                                          uint64_t pte0, uint64_t pte1)
> >  {
> >      CPUPPCState *env = &cpu->env;
> >      int i;
> >  
> >      if (!(pte0 & HPTE64_V_LARGE)) {
> > -        *seg_page_shift = 12;
> >          return 12;
> >      }
> >  
> > @@ -635,12 +633,10 @@ unsigned ppc_hash64_hpte_page_shift_noslb(PowerPCCPU *cpu,
> >  
> >          shift = hpte_page_shift(sps, pte0, pte1);
> >          if (shift) {
> > -            *seg_page_shift = sps->page_shift;
> >              return shift;
> >          }
> >      }
> >  
> > -    *seg_page_shift = 0;
> >      return 0;
> >  }
> >  
> > diff --git a/target-ppc/mmu-hash64.h b/target-ppc/mmu-hash64.h
> > index 13ad060cfefb..f625de03da44 100644
> > --- a/target-ppc/mmu-hash64.h
> > +++ b/target-ppc/mmu-hash64.h
> > @@ -17,8 +17,7 @@ void ppc_hash64_tlb_flush_hpte(PowerPCCPU *cpu,
> >                                 target_ulong pte_index,
> >                                 target_ulong pte0, target_ulong pte1);
> >  unsigned ppc_hash64_hpte_page_shift_noslb(PowerPCCPU *cpu,
> > -                                          uint64_t pte0, uint64_t pte1,
> > -                                          unsigned *seg_page_shift);
> > +                                          uint64_t pte0, uint64_t pte1);
> >  #endif
> >  
> >  /*
> 



-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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