linux-kernel - Re: [PATCH] arm64: mm: Fix memmap to be initialized for the entire section

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Message-ID: <20161117142528.GJ22855@arm.com>
Date:   Thu, 17 Nov 2016 14:25:29 +0000
From:   Will Deacon <will.deacon@....com>
To:     Robert Richter <robert.richter@...ium.com>
Cc:     Robert Richter <rric@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        David Daney <david.daney@...ium.com>,
        Hanjun Guo <hanjun.guo@...aro.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: mm: Fix memmap to be initialized for the entire
 section

On Wed, Nov 09, 2016 at 08:51:32PM +0100, Robert Richter wrote:
> Thus, I don't see where my patch breaks code. Even acpi_os_ioremap()
> keeps the same behaviour as before since it still uses memblock_is_
> memory(). Could you more describe your concerns why do you think this
> patch breaks the kernel and moves the problem somewhere else? I
> believe it fixes the problem at all.

acpi_os_ioremap always ends up in __ioremap_caller, regardless of
memblock_is_memory(). __ioremap_caller then fails if pfn_valid is true.

Will