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From: Linus Walleij <linus.walleij@linaro.org>
To: Ard Biesheuvel <ardb@kernel.org>, Rob Herring <robh+dt@kernel.org>
Cc: Florian Fainelli <f.fainelli@gmail.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Abbott Liu <liuwenliang@huawei.com>,
	Russell King <linux@armlinux.org.uk>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 1/6 v14] ARM: Handle a device tree in lowmem
Date: Tue, 6 Oct 2020 11:19:48 +0200	[thread overview]
Message-ID: <CACRpkdYq5sx3R7oo81r0NaWXjqZ-XSvyfW_wk9v-trH=YtoVEw@mail.gmail.com> (raw)
In-Reply-To: <CAMj1kXFJPB3sYuP8=kT5x=CRkUbjmRBgzBQHckB6fXKPuvK5Lw@mail.gmail.com>

On Tue, Oct 6, 2020 at 11:16 AM Ard Biesheuvel <ardb@kernel.org> wrote:

> We don't actually unmap the DT from the linear region, we just alias
> it elsewhere in the VA space, so that we don't have to reason about
> whether the DT is in the first memblock or below/above/whatever.
>
> So the DT is just one of the many memblock_reservations, and this
> actually doesn't change - the DT is still there, it is reserved, we
> just access it via another route.

Yeah I see.

I had a conversation with Rob Herring where he said it would be
nice if ARM used unflatten_and_copy_device_tree() like most
other architectures, but I don't know what it would bring us?
(Paging Rob.)

Yours,
Linus Walleij

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

  reply	other threads:[~2020-10-06  9:21 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-01 15:22 [PATCH 0/6 v14] KASan for Arm Linus Walleij
2020-10-01 15:22 ` [PATCH 1/6 v14] ARM: Handle a device tree in lowmem Linus Walleij
2020-10-01 16:45   ` Florian Fainelli
2020-10-01 20:31     ` Linus Walleij
2020-10-02 11:01   ` Ard Biesheuvel
2020-10-04 20:50     ` Linus Walleij
2020-10-05  7:14       ` Ard Biesheuvel
2020-10-05  9:14         ` Ard Biesheuvel
2020-10-05 13:27           ` Linus Walleij
2020-10-05 13:30             ` Linus Walleij
2020-10-05 13:36             ` Ard Biesheuvel
2020-10-05 14:22               ` Ard Biesheuvel
2020-10-06  9:11                 ` Linus Walleij
2020-10-06  9:16                   ` Ard Biesheuvel
2020-10-06  9:19                     ` Linus Walleij [this message]
2020-10-06  8:47           ` Linus Walleij
2020-10-06  8:48             ` Ard Biesheuvel
2020-10-05 12:26         ` Linus Walleij
2020-10-01 15:22 ` [PATCH 2/6 v14] ARM: Disable KASan instrumentation for some code Linus Walleij
2020-10-01 15:22 ` [PATCH 3/6 v14] ARM: Replace string mem* functions for KASan Linus Walleij
2020-10-01 15:22 ` [PATCH 4/6 v14] ARM: Define the virtual space of KASan's shadow region Linus Walleij
2020-10-01 15:22 ` [PATCH 5/6 v14] ARM: Initialize the mapping of KASan shadow memory Linus Walleij
2020-10-01 15:22 ` [PATCH 6/6 v14] ARM: Enable KASan for ARM Linus Walleij
2020-10-01 19:19 ` [PATCH 0/6 v14] KASan for Arm Florian Fainelli
2020-10-01 20:34   ` Linus Walleij
2020-10-01 20:38     ` Florian Fainelli
2020-10-01 21:18   ` Linus Walleij
2020-10-01 21:29     ` Arnd Bergmann
2020-10-01 21:35     ` Florian Fainelli
2020-10-03 15:50   ` Ard Biesheuvel
2020-10-04  8:06     ` Ard Biesheuvel
2020-10-04  8:41       ` Ard Biesheuvel
2020-10-04  9:09         ` Ard Biesheuvel
2020-10-04 20:24           ` Florian Fainelli
2020-10-05  8:40           ` Linus Walleij
2020-10-06 13:21 ` Linus Walleij

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