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: 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>

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 24d5653..c0095bf 100644 (file)
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -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