[PATCH 09/14] powerpc: reword ARCH_FORCE_MAX_ORDER prompt and help text

Mike Rapoport
2023-03-23T09:21:51Z

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.

Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
---
arch/powerpc/Kconfig | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 24d56536b269..c0095bf795ca 100644
--- 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
--
2.35.1