MIPS: Add a CONFIG_FORCE_MAX_ZONEORDER Kconfig option.

For huge page support with base page size of 16K or 32K, we have to
increase the MAX_ORDER so that huge pages can be allocated.

[Ralf: I don't think a user should have to configure obscure constants like
this but for the time being this will have to suffice.]

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1685/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 7fc6bd1d3852e4403152619c9cb3e3a5fd9bf3af..0a9b5b8b2a1935103ecf9d81a2367d0a0633f1e4 100644 (file)
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1666,6 +1666,28 @@ config PAGE_SIZE_64KB
 
 endchoice
 
+config FORCE_MAX_ZONEORDER
+       int "Maximum zone order"
+       range 13 64 if SYS_SUPPORTS_HUGETLBFS && PAGE_SIZE_32KB
+       default "13" if SYS_SUPPORTS_HUGETLBFS && PAGE_SIZE_32KB
+       range 12 64 if SYS_SUPPORTS_HUGETLBFS && PAGE_SIZE_16KB
+       default "12" if SYS_SUPPORTS_HUGETLBFS && PAGE_SIZE_16KB
+       range 11 64
+       default "11"
+       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.
+
+         This config option is actually maximum order plus one. For example,
+         a value of 11 means that the largest free memory block is 2^10 pages.
+
+         The page size is not necessarily 4KB.  Keep this in mind
+         when choosing a value for this option.
+
 config BOARD_SCACHE
        bool