MAX_ORDER which invariably depends on FORCE_MAX_ZONEORDER can be a variable for a given page size, depending on whether TRANSPARENT_HUGEPAGE is enabled or not. In certain page size and THP combinations HUGETLB_PAGE_ORDER can be greater than MAX_ORDER, making it unusable as pageblock_order.
This enables HUGETLB_PAGE_SIZE_VARIABLE making pageblock_order a variable rather than the compile time constant HUGETLB_PAGE_ORDER which could break MAX_ORDER rule for certain configurations. Cc: Catalin Marinas <[email protected]> Cc: Will Deacon <[email protected]> Cc: [email protected] Cc: [email protected] Signed-off-by: Anshuman Khandual <[email protected]> --- arch/arm64/Kconfig | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index f39568b28ec1..8e3a5578f663 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1909,6 +1909,10 @@ config ARCH_ENABLE_THP_MIGRATION def_bool y depends on TRANSPARENT_HUGEPAGE +config HUGETLB_PAGE_SIZE_VARIABLE + def_bool y + depends on HUGETLB_PAGE + menu "Power management options" source "kernel/power/Kconfig" -- 2.20.1
