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 <catalin.marinas@xxxxxxx> Cc: Will Deacon <will@xxxxxxxxxx> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx Cc: linux-kernel@xxxxxxxxxxxxxxx Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx> --- arch/arm64/Kconfig | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 175914f2f340..c4acf8230f20 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1918,6 +1918,10 @@ 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
