linux-kernel - Re: [PATCH v2] MIPS/bpf: Enable bpf_probe

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Message-ID: <alpine.DEB.2.21.2103222037450.21463@angie.orcam.me.uk>
Date:   Mon, 22 Mar 2021 20:39:07 +0100 (CET)
From:   "Maciej W. Rozycki" <macro@...am.me.uk>
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>
cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-mips@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, Xuefeng Li <lixuefeng@...ngson.cn>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2] MIPS/bpf: Enable bpf_probe_read{, str}() on MIPS
 again

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