The quilt patch titled
Subject: arm64: reword ARCH_FORCE_MAX_ORDER prompt and help text
has been removed from the -mm tree. Its filename was
arm64-reword-arch_force_max_order-prompt-and-help-text.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: "Mike Rapoport (IBM)" <rppt@xxxxxxxxxx>
Subject: arm64: reword ARCH_FORCE_MAX_ORDER prompt and help text
Date: Fri, 24 Mar 2023 08:22:22 +0300
The prompt and help text of ARCH_FORCE_MAX_ORDER are not even close to
describe this configuration option.
Update both to actually describe what this option does.
[rppt@xxxxxxxxxx: change ARCH_FORCE_MAX_ORDER dependencies]
Link: https://lkml.kernel.org/r/20230325060828.2662773-4-rppt@xxxxxxxxxx
Link: https://lkml.kernel.org/r/20230324052233.2654090-4-rppt@xxxxxxxxxx
Signed-off-by: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Reviewed-by: Zi Yan <ziy@xxxxxxxxxx>
Reviewed-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Cc: David Miller <davem@xxxxxxxxxxxxx>
Cc: Dinh Nguyen <dinguyen@xxxxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: Guo Ren <guoren@xxxxxxxxxx>
Cc: John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx>
Cc: Max Filippov <jcmvbkbc@xxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Rich Felker <dalias@xxxxxxxx>
Cc: "Russell King (Oracle)" <linux@xxxxxxxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm64/Kconfig | 24 ++++++++++++------------
1 file changed, 12 insertions(+), 12 deletions(-)
--- a/arch/arm64/Kconfig~arm64-reword-arch_force_max_order-prompt-and-help-text
+++ a/arch/arm64/Kconfig
@@ -1487,24 +1487,24 @@ config XEN
# 16K | 27 | 14 | 13 | 11 |
# 64K | 29 | 16 | 13 | 13 |
config ARCH_FORCE_MAX_ORDER
- int "Maximum zone order" if EXPERT && (ARM64_4K_PAGES || ARM64_16K_PAGES)
+ int "Order of maximal physically contiguous allocations" if EXPERT && (ARM64_4K_PAGES || ARM64_16K_PAGES)
default "13" if ARM64_64K_PAGES
default "11" if ARM64_16K_PAGES
default "10"
help
- The kernel memory allocator divides physically contiguous memory
- blocks into "zones", where each zone is a power of two number of
- pages. This option selects the largest power of two that the kernel
- keeps in the memory allocator. If you need to allocate very large
- blocks of physically contiguous memory, then you may need to
- increase this value.
+ The kernel page allocator limits the size of maximal physically
+ contiguous allocations. The limit is called MAX_ORDER and it
+ defines the maximal power of two of number of pages that can be
+ allocated as a single contiguous block. This option allows
+ overriding the default setting when ability to allocate very
+ large blocks of physically contiguous memory is required.
- We make sure that we can allocate up to a HugePage size for each configuration.
- Hence we have :
- MAX_ORDER = PMD_SHIFT - PAGE_SHIFT => PAGE_SHIFT - 3
+ The maximal size of allocation cannot exceed the size of the
+ section, so the value of MAX_ORDER should satisfy
- However for 4K, we choose a higher default value, 10 as opposed to 9, giving us
- 4M allocations matching the default size used by generic code.
+ MAX_ORDER + PAGE_SHIFT <= SECTION_SIZE_BITS
+
+ Don't change if unsure.
config UNMAP_KERNEL_AT_EL0
bool "Unmap kernel when running in userspace (aka \"KAISER\")" if EXPERT
_
Patches currently in -mm which might be from rppt@xxxxxxxxxx are
csky-drop-arch_force_max_order.patch
ia64-dont-allow-users-to-override-arch_force_max_order.patch
m68k-reword-arch_force_max_order-prompt-and-help-text.patch
nios2-reword-arch_force_max_order-prompt-and-help-text.patch
nios2-drop-ranges-for-definition-of-arch_force_max_order.patch
powerpc-reword-arch_force_max_order-prompt-and-help-text.patch
powerpc-drop-ranges-for-definition-of-arch_force_max_order.patch
sh-reword-arch_force_max_order-prompt-and-help-text.patch
sh-drop-ranges-for-definition-of-arch_force_max_order.patch
sparc-reword-arch_force_max_order-prompt-and-help-text.patch
xtensa-reword-arch_force_max_order-prompt-and-help-text.patch
mm-move-free_area_empty-to-mm-internalh.patch
