Commit 6fc54303 authored by Mike Rapoport (IBM)'s avatar Mike Rapoport (IBM) Committed by Andrew Morton
Browse files

powerpc: reword ARCH_FORCE_MAX_ORDER prompt and help text 

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: default avatarMike Rapoport (IBM) <rppt@kernel.org>
Acked-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: default avatarZi 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: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 482f7b76

arch/powerpc/Kconfig

+9 −7
Original line number Diff line number Diff line
@@ -896,7 +896,7 @@ config DATA_SHIFT 
	  8M pages will be pinned.



config ARCH_FORCE_MAX_ORDER

	int "Maximum zone order"

	int "Order of maximal physically contiguous allocations"

	range 7 8 if PPC64 && PPC_64K_PAGES

	default "8" 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

	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.



	  The page size is not necessarily 4KB.  For example, on 64-bit

	  systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES.  Keep

	  this in mind when choosing a value for this option.



	  Don't change if unsure.



config PPC_SUBPAGE_PROT

	bool "Support setting protections for 4k subpages (subpage_prot syscall)"

	default n