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From:   Pavel Tatashin <pasha.tatashin@soleen.com>
Date:   Fri, 10 Jan 2020 11:19:16 -0500
Message-ID: <CA+CK2bAy-vfoz3kgUjZB74Hrobgu-a8H4pv6RbA_tbq++NWz5g@mail.gmail.com>
Subject: Re: [PATCH v4 2/2] arm64: kexec_file: add crash dump support
To:     Will Deacon <will@kernel.org>
Cc:     AKASHI Takahiro <takahiro.akashi@linaro.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>, robh+dt@kernel.org,
        frowand.list@gmail.com, Bhupesh Sharma <bhsharma@redhat.com>,
        kexec mailing list <kexec@lists.infradead.org>,
        LKML <linux-kernel@vger.kernel.org>,
        James Morse <james.morse@arm.com>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>
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On Fri, Jan 10, 2020 at 11:05 AM Will Deacon <will@kernel.org> wrote:
>
> On Thu, Jan 09, 2020 at 08:32:54AM +0000, Will Deacon wrote:
> > On Thu, Jan 09, 2020 at 09:46:55AM +0900, AKASHI Takahiro wrote:
> > > On Wed, Jan 08, 2020 at 05:48:39PM +0000, Will Deacon wrote:
> > > > On Mon, Dec 16, 2019 at 11:12:47AM +0900, AKASHI Takahiro wrote:
> > > > > diff --git a/arch/arm64/include/asm/kexec.h b/arch/arm64/include/asm/kexec.h
> > > > > index 12a561a54128..d24b527e8c00 100644
> > > > > --- a/arch/arm64/include/asm/kexec.h
> > > > > +++ b/arch/arm64/include/asm/kexec.h
> > > > > @@ -96,6 +96,10 @@ static inline void crash_post_resume(void) {}
> > > > >  struct kimage_arch {
> > > > >         void *dtb;
> > > > >         unsigned long dtb_mem;
> > > > > +       /* Core ELF header buffer */
> > > > > +       void *elf_headers;
> > > > > +       unsigned long elf_headers_mem;
> > > > > +       unsigned long elf_headers_sz;
> > > > >  };
> > > >
> > > > This conflicts with the cleanup work from Pavel. Please can you check my
> > > > resolution? [1]
> > >
> > > I don't know why we need to change a type of dtb_mem,
> > > otherwise it looks good.
> > >
> > > (I also assume that you notice that kimage_arch is of no use for kexec.)
> >
> > Yes, that's why I'd like the resolution checked. If you reckon it's cleaner
> > to drop Pavel's patch altogether in light of your changes, we can do that
> > instead.
> >
> > Thoughts?
>
> Well, I've reverted the cleanup patch so please shout if you'd prefer
> something else.

As I understand, the only concern was the type change for dtb_mem.
This was one of the review comments for my patch
https://lore.kernel.org/lkml/20191204155938.2279686-21-pasha.tatashin@soleen.com/

(I believe it was from Marc Zyngier), I add a number of new fields,
and they all should be phys_addr_t, this is why I change dtb_mem to
phys_addr_t to be consistent.

Pasha