MIPS: Add a CONFIG_FORCE_MAX_ZONEORDER Kconfig option. (c9bace7c) · Commits · 戴 / test

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>

arch/mips/Kconfig

+22 −0

Original line number	Diff line number	Diff line
		@@ -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

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