[PATCH v15 06/23] selftests/vm/pkeys: Typecast the pkey register

[Michal Suchánek]

On Wed, Dec 18, 2019 at 12:46:50PM -0800, Dave Hansen wrote:
> On 12/17/19 11:51 PM, Sandipan Das wrote:
> >  	write_pkey_reg(pkey_reg);
> > -	dprintf4("pkey_reg now: %08x\n", read_pkey_reg());
> > +	dprintf4("pkey_reg now: "PKEY_REG_FMT"\n", read_pkey_reg());
> >  }
> >  
> >  #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
> > diff --git a/tools/testing/selftests/vm/pkey-x86.h b/tools/testing/selftests/vm/pkey-x86.h
> > index 2f04ade8ca9c..5f40901219d3 100644
> > --- a/tools/testing/selftests/vm/pkey-x86.h
> > +++ b/tools/testing/selftests/vm/pkey-x86.h
> > @@ -46,6 +46,8 @@
> >  #define HPAGE_SIZE		(1UL<<21)
> >  #define PAGE_SIZE		4096
> >  #define MB			(1<<20)
> > +#define pkey_reg_t		u32
> > +#define PKEY_REG_FMT		"%016x"
> 
> How big is the ppc one?
u64
> 
> I'd really just rather do %016lx *everywhere* than sprinkle the
> PKEY_REG_FMTs around.

Does lx work with u32 without warnings?

It's likely the size difference that requires a format specifier definition.

> 
> BTW, why are you doing a %016lx for a u32?

It's "%016x" without 'l' for x86 and with 'l' for ppc64.

Thanks

Michal