On Wed, May 21, 2014 at 03:04:20PM +0200, Ralf Baechle wrote:
> On Wed, May 21, 2014 at 10:38:39AM +0100, James Hogan wrote:
>
> > On 20/05/14 15:47, Andreas Herrmann wrote:
> > > From: David Daney <david.daney@xxxxxxxxxx>
> > >
> > > The fast handler only supports 64-bit kernels.
> > >
> > > Signed-off-by: David Daney <david.daney@xxxxxxxxxx>
> > > Signed-off-by: Andreas Herrmann <andreas.herrmann@xxxxxxxxxxxxxxxxxx>
> > > ---
> > > arch/mips/mm/tlbex.c | 8 ++++++--
> > > 1 file changed, 6 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c
> > > index ee88367..781e183 100644
> > > --- a/arch/mips/mm/tlbex.c
> > > +++ b/arch/mips/mm/tlbex.c
> > > @@ -1250,13 +1250,17 @@ static void build_r4000_tlb_refill_handler(void)
> > > unsigned int final_len;
> > > struct mips_huge_tlb_info htlb_info __maybe_unused;
> > > enum vmalloc64_mode vmalloc_mode __maybe_unused;
> > > -
> > > +#ifdef CONFIG_64BIT
> > > + bool is64bit = true;
> > > +#else
> > > + bool is64bit = false;
> > > +#endif
> > > memset(tlb_handler, 0, sizeof(tlb_handler));
> > > memset(labels, 0, sizeof(labels));
> > > memset(relocs, 0, sizeof(relocs));
> > > memset(final_handler, 0, sizeof(final_handler));
> > >
> > > - if ((scratch_reg >= 0 || scratchpad_available()) && use_bbit_insns()) {
> > > + if (is64bit && (scratch_reg >= 0 || scratchpad_available()) && use_bbit_insns()) {
> > > htlb_info = build_fast_tlb_refill_handler(&p, &l, &r, K0, K1,
> > > scratch_reg);
> > > vmalloc_mode = refill_scratch;
> > >
> >
> > This looks like a good place to use IS_ENABLED(CONFIG_64BIT) to reduce
> > ifdefery.
>
> Or even the classic "if (sizeof(unsigned long) == 8)" which is a little less
> expressive but more portable.
Ok, makes sense.
(Will use one of the two suggestions.)
Thanks,
Andreas
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