[RFC PATCH 0/4] x86_64/mm: remove bottom-up allocation style by pushing forward the parsing of mem hotplug info

From: Pingfan Liu
Date: Mon Jan 07 2019 - 03:25:47 EST

Background about the defect of the current bottom-up allocation style, take
the following scenario:
| unmovable node | movable node |
| kaslr-kernel |subtree of pgtable for phy<->virt |

Although kaslr-kernel can avoid to stain the movable node. But the
pgtable can still stain the movable node. That is a probability problem,
with low probability, but still exist. This patch tries to eliminate the
probability. With the previous patch, at the point of init_mem_mapping(),
memblock allocator can work with the knowledge of acpi memory hotmovable
info, and avoid to stain the movable node. As a result,
memory_map_bottom_up() is not needed any more.

Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
Cc: Len Brown <lenb@xxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx

Pingfan Liu (4):
acpi: change the topo of acpi_table_upgrade()
x86/setup: parse acpi to get hotplug info before init_mem_mapping()
x86/mm: set allowed range for memblock allocator
x86/mm: remove bottom-up allocation style for x86_64

arch/arm64/kernel/setup.c | 2 +-
arch/x86/kernel/setup.c | 17 ++++-
arch/x86/mm/init.c | 154 +++++++---------------------------------------
arch/x86/mm/init_32.c | 123 ++++++++++++++++++++++++++++++++++++
arch/x86/mm/mm_internal.h | 7 +++
drivers/acpi/tables.c | 4 +-
include/linux/acpi.h | 5 +-
7 files changed, 172 insertions(+), 140 deletions(-)