linux-kernel - [PATCH 5.10 24/42] arm64: mm: Move reserve_crashkernel() into mem

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Message-Id: <20210308122719.315066515@linuxfoundation.org>
Date:   Mon,  8 Mar 2021 13:30:50 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Jeremy Linton <jeremy.linton@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Jing Xiangfeng <jingxiangfeng@...wei.com>
Subject: [PATCH 5.10 24/42] arm64: mm: Move reserve_crashkernel() into mem_init()

From: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>

commit 0a30c53573b07d5561457e41fb0ab046cd857da5 upstream

crashkernel might reserve memory located in ZONE_DMA. We plan to delay
ZONE_DMA's initialization after unflattening the devicetree and ACPI's
boot table initialization, so move it later in the boot process.
Specifically into bootmem_init() since request_standard_resources()
depends on it.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Tested-by: Jeremy Linton <jeremy.linton@....com>
Link: https://lore.kernel.org/r/20201119175400.9995-2-nsaenzjulienne@suse.de
Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Cc: <stable@...r.kernel.org>
Signed-off-by: Jing Xiangfeng <jingxiangfeng@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/arm64/mm/init.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -386,8 +386,6 @@ void __init arm64_memblock_init(void)
 	else
 		arm64_dma32_phys_limit = PHYS_MASK + 1;
 
-	reserve_crashkernel();
-
 	reserve_elfcorehdr();
 
 	high_memory = __va(memblock_end_of_DRAM() - 1) + 1;
@@ -427,6 +425,12 @@ void __init bootmem_init(void)
 	sparse_init();
 	zone_sizes_init(min, max);
 
+	/*
+	 * request_standard_resources() depends on crashkernel's memory being
+	 * reserved, so do it here.
+	 */
+	reserve_crashkernel();
+
 	memblock_dump_all();
 }