Re: [PATCH v2] MIPS/bpf: Enable bpf_probe_read{, str}() on MIPS again

[Maciej W. Rozycki]

On Mon, 22 Mar 2021, Tiezhu Yang wrote:

> > > --- a/arch/mips/Kconfig
> > > +++ b/arch/mips/Kconfig
> > > @@ -6,6 +6,7 @@ config MIPS
> > >   	select ARCH_BINFMT_ELF_STATE if MIPS_FP_SUPPORT
> > >   	select ARCH_HAS_FORTIFY_SOURCE
> > >   	select ARCH_HAS_KCOV
> > > +	select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
> >   Hmm, documentation on ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE seems rather
> > scarce, but based on my guess shouldn't this be "if !EVA"?
> 
> I do not quite know what the effect if MIPS EVA (Enhanced Virtual Addressing)
> is set, I saw that ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE should be restricted
> to archs with non-overlapping address ranges.
> 
> I wonder whether MIPS EVA will generate overlapping address ranges?

 The architecture specification has it all.

  Maciej