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Date:   Mon, 6 Nov 2017 11:00:09 -0800
From:   Bjorn Andersson <>
To:     "Kirill A. Shutemov" <>
Cc:     Sudeep Holla <>,
        "Kirill A. Shutemov" <>,
        Ingo Molnar <>,
        Thomas Gleixner <>,
        Peter Zijlstra <>,,
        Andrew Morton <>,,
        Andy Lutomirski <>,,
        open list <>,
        Linus Torvalds <>,
        Will Deacon <>,
        Catalin Marinas <>
Subject: Re: [tip:x86/mm] mm/sparsemem: Allocate mem_section at runtime for CONFIG_SPARSEMEM_EXTREME=y

On Thu, Nov 2, 2017 at 7:12 AM, Kirill A. Shutemov
<> wrote:
> Could you try the patch below instead?
> From 4a9d843f9d939d958612b0079ebe5743f265e1e0 Mon Sep 17 00:00:00 2001
> From: "Kirill A. Shutemov" <>
> Date: Thu, 2 Nov 2017 17:02:29 +0300
> Subject: [PATCH] mm, sparse: Fix boot on arm64
> Since 83e3c48729d9 ("mm/sparsemem: Allocate mem_section at runtime for
> CONFIG_SPARSEMEM_EXTREME=y") we allocate mem_section dynamically in
> sparse_memory_present_with_active_regions(). But some architectures, like
> arm64, don't use the routine to initialize sparsemem.
> Let's move the initialization into memory_present() it should cover all
> architectures.
> Signed-off-by: Kirill A. Shutemov <>
> Fixes: 83e3c48729d9 ("mm/sparsemem: Allocate mem_section at runtime for CONFIG_SPARSEMEM_EXTREME=y")

Will you send out this patch, or will someone pick it up from here?

As with the other arm64 boards this is the difference between
linux-next (and presumably v4.15-rc1) booting or not on my Qualcomm

Tested-by: Bjorn Andersson <>


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