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powerpc: reword ARCH_FORCE_MAX_ORDER prompt and help text

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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.

Link: https://lkml.kernel.org/r/20230324052233.2654090-10-rppt@kernel.org
Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: David Miller <davem@davemloft.net>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Guo Ren <guoren@kernel.org>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Rich Felker <dalias@libc.org>
Cc: "Russell King (Oracle)" <linux@armlinux.org.uk>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Mike Rapoport (IBM) 2023-03-24 08:22:28 +03:00 committed by Andrew Morton
parent 482f7b7652
commit 6fc54303aa
1 changed files with 9 additions and 7 deletions
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16
arch/powerpc/Kconfig
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@ -896,7 +896,7 @@ config DATA_SHIFT
8M pages will be pinned. 8M pages will be pinned.
config ARCH_FORCE_MAX_ORDER config ARCH_FORCE_MAX_ORDER
int "Maximum zone order" int "Order of maximal physically contiguous allocations"
range 7 8 if PPC64 && PPC_64K_PAGES range 7 8 if PPC64 && PPC_64K_PAGES
default "8" if PPC64 && PPC_64K_PAGES default "8" if PPC64 && PPC_64K_PAGES
range 12 12 if PPC64 && !PPC_64K_PAGES range 12 12 if PPC64 && !PPC_64K_PAGES
@ -910,17 +910,19 @@ config ARCH_FORCE_MAX_ORDER
range 10 63 range 10 63
default "10" default "10"
help help
The kernel memory allocator divides physically contiguous memory The kernel page allocator limits the size of maximal physically
blocks into "zones", where each zone is a power of two number of contiguous allocations. The limit is called MAX_ORDER and it
pages. This option selects the largest power of two that the kernel defines the maximal power of two of number of pages that can be
keeps in the memory allocator. If you need to allocate very large allocated as a single contiguous block. This option allows
blocks of physically contiguous memory, then you may need to overriding the default setting when ability to allocate very
increase this value. large blocks of physically contiguous memory is required.
The page size is not necessarily 4KB. For example, on 64-bit The page size is not necessarily 4KB. For example, on 64-bit
systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
this in mind when choosing a value for this option. this in mind when choosing a value for this option.
Don't change if unsure.
config PPC_SUBPAGE_PROT config PPC_SUBPAGE_PROT
bool "Support setting protections for 4k subpages (subpage_prot syscall)" bool "Support setting protections for 4k subpages (subpage_prot syscall)"
default n default n