On Thu, Feb 11, 2021 at 11:52:10AM +0530, Anshuman Khandual wrote: > 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 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 Please move the definition of HUGETLB_PAGE_SIZE_VARIABLE to mm/Kconfig and select it from the arch Kconfigfs instead of duplicating the definition.
