arm64: drop ranges in definition of ARCH_FORCE_MAX_ORDER

It is not a good idea to change fundamental parameters of core memory
management.  Having predefined ranges suggests that the values within
those ranges are sensible, but one has to *really* understand implications
of changing MAX_ORDER before actually amending it and ranges don't help
here.

Drop ranges in definition of ARCH_FORCE_MAX_ORDER and make its prompt
visible only if EXPERT=y

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Mike Rapoport (IBM) <[email protected]>
Reviewed-by: Zi Yan <[email protected]>
Reviewed-by: Kefeng Wang <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Christophe Leroy <[email protected]>
Cc: David Miller <[email protected]>
Cc: Dinh Nguyen <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: Guo Ren <[email protected]>
Cc: John Paul Adrian Glaubitz <[email protected]>
Cc: Kirill A. Shutemov <[email protected]>
Cc: Max Filippov <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Rich Felker <[email protected]>
Cc: "Russell King (Oracle)" <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Yoshinori Sato <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index e60baf7859d1ce90af012cea86a07be4ea662762..7324032af859034abfab4f53e2042f35a3cc73ce 100644 (file)
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1487,11 +1487,9 @@ config XEN
 # 16K |       27          |      14      |       13        |         11         |
 # 64K |       29          |      16      |       13        |         13         |
 config ARCH_FORCE_MAX_ORDER
-       int "Maximum zone order" if ARM64_4K_PAGES || ARM64_16K_PAGES
+       int "Maximum zone order" if EXPERT && (ARM64_4K_PAGES || ARM64_16K_PAGES)
        default "13" if ARM64_64K_PAGES
-       range 11 13 if ARM64_16K_PAGES
        default "11" if ARM64_16K_PAGES
-       range 10 15 if ARM64_4K_PAGES
        default "10"
        help
          The kernel memory allocator divides physically contiguous memory