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From: Rob Herring <robh+dt@kernel.org>
To: Hsin-Yi Wang <hsinyi@chromium.org>
Cc: "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
	<linux-arm-kernel@lists.infradead.org>,
	devicetree@vger.kernel.org,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Frank Rowand <frowand.list@gmail.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Miles Chen <miles.chen@mediatek.com>,
	James Morse <james.morse@arm.com>,
	Andrew Murray <andrew.murray@arm.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Jun Yao <yaojun8558363@gmail.com>, Yu Zhao <yuzhao@google.com>,
	Robin Murphy <robin.murphy@arm.com>,
	Laura Abbott <labbott@redhat.com>,
	Stephen Boyd <swboyd@chromium.org>,
	Kees Cook <keescook@chromium.org>
Subject: Re: [PATCH v3 2/3] arm64: implement update_fdt_pgprot()
Date: Thu, 16 May 2019 10:32:37 -0500	[thread overview]
Message-ID: <CAL_Jsq+dVg9E_EzpoC4Bz1ytUckDGXUcEJyU5pV2HS6rZuKmHA@mail.gmail.com> (raw)
In-Reply-To: <CAJMQK-jrJQri3gM=X6JRD6Rk+B5S4939HJTptrQMY64xEWr1qA@mail.gmail.com>

On Thu, May 16, 2019 at 9:51 AM Hsin-Yi Wang <hsinyi@chromium.org> wrote:
>
> On Thu, May 16, 2019 at 10:37 PM Rob Herring <robh+dt@kernel.org> wrote:
>
> >
> > Why not just map the FDT R/W at the start and change it to RO just
> > before calling unflatten_device_tree? Then all the FDT scanning
> > functions or any future fixups we need can just assume R/W. That is
> > essentially what Stephen suggested. However, there's no need for a
> > weak function as it can all be done within the arch code.
> >
> We need to add a new seed for kexec

Doesn't kexec operate on a copy because it already does modifications.

Rob

WARNING: multiple messages have this Message-ID (diff)
From: Rob Herring <robh+dt@kernel.org>
To: Hsin-Yi Wang <hsinyi@chromium.org>
Cc: "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE"
	<linux-arm-kernel@lists.infradead.org>,
	devicetree@vger.kernel.org,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Frank Rowand <frowand.list@gmail.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Miles Chen <miles.chen@mediatek.com>,
	James Morse <james.morse@arm.com>,
	Andrew Murray <andrew.murray@arm.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Jun Yao <yaojun8558363@gmail.com>, Yu Zhao <yuzhao@google.com>,
	Robin Murphy <robin.murphy@arm.com>,
	Laura Abbott <labbott@redhat.com>,
	Stephen Boyd <swboyd@chromium.org>,
	Kees
Subject: Re: [PATCH v3 2/3] arm64: implement update_fdt_pgprot()
Date: Thu, 16 May 2019 10:32:37 -0500	[thread overview]
Message-ID: <CAL_Jsq+dVg9E_EzpoC4Bz1ytUckDGXUcEJyU5pV2HS6rZuKmHA@mail.gmail.com> (raw)
In-Reply-To: <CAJMQK-jrJQri3gM=X6JRD6Rk+B5S4939HJTptrQMY64xEWr1qA@mail.gmail.com>

On Thu, May 16, 2019 at 9:51 AM Hsin-Yi Wang <hsinyi@chromium.org> wrote:
>
> On Thu, May 16, 2019 at 10:37 PM Rob Herring <robh+dt@kernel.org> wrote:
>
> >
> > Why not just map the FDT R/W at the start and change it to RO just
> > before calling unflatten_device_tree? Then all the FDT scanning
> > functions or any future fixups we need can just assume R/W. That is
> > essentially what Stephen suggested. However, there's no need for a
> > weak function as it can all be done within the arch code.
> >
> We need to add a new seed for kexec

Doesn't kexec operate on a copy because it already does modifications.

Rob

WARNING: multiple messages have this Message-ID (diff)
From: Rob Herring <robh+dt@kernel.org>
To: Hsin-Yi Wang <hsinyi@chromium.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
	devicetree@vger.kernel.org, Yu Zhao <yuzhao@google.com>,
	Kees Cook <keescook@chromium.org>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Stephen Boyd <swboyd@chromium.org>,
	Will Deacon <will.deacon@arm.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Jun Yao <yaojun8558363@gmail.com>,
	Miles Chen <miles.chen@mediatek.com>,
	James Morse <james.morse@arm.com>,
	Andrew Murray <andrew.murray@arm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Laura Abbott <labbott@redhat.com>,
	Frank Rowand <frowand.list@gmail.com>,
	"moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE"
	<linux-arm-kernel@lists.infradead.org>,
	Robin Murphy <robin.murphy@arm.com>
Subject: Re: [PATCH v3 2/3] arm64: implement update_fdt_pgprot()
Date: Thu, 16 May 2019 10:32:37 -0500	[thread overview]
Message-ID: <CAL_Jsq+dVg9E_EzpoC4Bz1ytUckDGXUcEJyU5pV2HS6rZuKmHA@mail.gmail.com> (raw)
In-Reply-To: <CAJMQK-jrJQri3gM=X6JRD6Rk+B5S4939HJTptrQMY64xEWr1qA@mail.gmail.com>

On Thu, May 16, 2019 at 9:51 AM Hsin-Yi Wang <hsinyi@chromium.org> wrote:
>
> On Thu, May 16, 2019 at 10:37 PM Rob Herring <robh+dt@kernel.org> wrote:
>
> >
> > Why not just map the FDT R/W at the start and change it to RO just
> > before calling unflatten_device_tree? Then all the FDT scanning
> > functions or any future fixups we need can just assume R/W. That is
> > essentially what Stephen suggested. However, there's no need for a
> > weak function as it can all be done within the arch code.
> >
> We need to add a new seed for kexec

Doesn't kexec operate on a copy because it already does modifications.

Rob

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2019-05-16 15:32 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-16 10:28 [PATCH v3 1/3] include/of_fdt.h: add a weak arch hook to update fdt pgprot Hsin-Yi Wang
2019-05-16 10:28 ` Hsin-Yi Wang
2019-05-16 10:28 ` Hsin-Yi Wang
2019-05-16 10:28 ` [PATCH v3 2/3] arm64: implement update_fdt_pgprot() Hsin-Yi Wang
2019-05-16 10:28   ` Hsin-Yi Wang
2019-05-16 10:28   ` Hsin-Yi Wang
2019-05-16 14:37   ` Rob Herring
2019-05-16 14:37     ` Rob Herring
2019-05-16 14:37     ` Rob Herring
2019-05-16 14:39     ` Ard Biesheuvel
2019-05-16 14:39       ` Ard Biesheuvel
2019-05-16 14:39       ` Ard Biesheuvel
2019-05-16 14:43     ` Mark Rutland
2019-05-16 14:43       ` Mark Rutland
2019-05-16 14:43       ` Mark Rutland
2019-05-16 15:17       ` Rob Herring
2019-05-16 15:17         ` Rob Herring
2019-05-16 15:17         ` Rob Herring
2019-05-16 14:51     ` Hsin-Yi Wang
2019-05-16 14:51       ` Hsin-Yi Wang
2019-05-16 14:51       ` Hsin-Yi Wang
2019-05-16 15:32       ` Rob Herring [this message]
2019-05-16 15:32         ` Rob Herring
2019-05-16 15:32         ` Rob Herring
2019-05-16 16:48         ` Hsin-Yi Wang
2019-05-16 16:48           ` Hsin-Yi Wang
2019-05-16 16:48           ` Hsin-Yi Wang
2019-05-16 17:34           ` James Morse
2019-05-16 17:34             ` James Morse
2019-05-16 17:34             ` James Morse
2019-05-16 17:44             ` Stephen Boyd
2019-05-16 17:44               ` Stephen Boyd
2019-05-16 17:44               ` Stephen Boyd
2019-05-16 10:28 ` [PATCH v3 3/3] fdt: add support for rng-seed Hsin-Yi Wang
2019-05-16 10:28   ` Hsin-Yi Wang
2019-05-16 10:28   ` Hsin-Yi Wang
2019-05-16 15:39   ` Randy Dunlap
2019-05-16 15:39     ` Randy Dunlap

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