linux-kernel - [PATCH v5 1/7] arm64: mm: Move reserve_crashkernel() into mem

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Date:   Thu, 29 Oct 2020 18:25:44 +0100
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     robh+dt@...nel.org, catalin.marinas@....com, hch@....de,
        ardb@...nel.org, linux-kernel@...r.kernel.org
Cc:     robin.murphy@....com, linux-arm-kernel@...ts.infradead.org,
        linux-rpi-kernel@...ts.infradead.org, jeremy.linton@....com,
        iommu@...ts.linux-foundation.org, devicetree@...r.kernel.org,
        will@...nel.org, lorenzo.pieralisi@....com, guohanjun@...wei.com,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Subject: [PATCH v5 1/7] arm64: mm: Move reserve_crashkernel() into mem_init()

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 mem_init(), this is the last place crashkernel will be
able to reserve the memory before the page allocator kicks in. There
isn't any apparent reason for doing this earlier.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Tested-by: Jeremy Linton <jeremy.linton@....com>
---
 arch/arm64/mm/init.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 095540667f0f..fc4ab0d6d5d2 100644
--- 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;
@@ -508,6 +506,8 @@ void __init mem_init(void)
 	else
 		swiotlb_force = SWIOTLB_NO_FORCE;
 
+	reserve_crashkernel();
+
 	set_max_mapnr(max_pfn - PHYS_PFN_OFFSET);
 
 #ifndef CONFIG_SPARSEMEM_VMEMMAP
-- 
2.29.0