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Date: Mon, 19 Oct 2015 14:19:38 +0100 From: "Suzuki K. Poulose" <suzuki.poulose@....com> To: linux-arm-kernel@...ts.infradead.org Cc: linux-kernel@...r.kernel.org, mark.rutland@....com, marc.zyngier@....com, will.deacon@....com, catalin.marinas@....com, christoffer.dall@...aro.org, steve.capper@...aro.org, ard.biesheuvel@...aro.org, jeremy.linton@....com, "Suzuki K. Poulose" <suzuki.poulose@....com> Subject: [PATCHv4 12/12] arm64: 36 bit VA 36bit VA lets us use 2 level page tables while limiting the available address space to 64GB. Cc: Mark Rutland <mark.rutland@....com> Cc: Catalin Marinas <catalin.marinas@....com> Cc: Will Deacon <will.deacon@....com> Cc: Steve Capper <steve.capper@...aro.org> Signed-off-by: Suzuki K. Poulose <suzuki.poulose@....com> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@...aro.org> Tested-by: Ard Biesheuvel <ard.biesheuvel@...aro.org> --- arch/arm64/Kconfig | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 8541664..a346671 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -170,6 +170,7 @@ config FIX_EARLYCON_MEM config PGTABLE_LEVELS int + default 2 if ARM64_16K_PAGES && ARM64_VA_BITS_36 default 2 if ARM64_64K_PAGES && ARM64_VA_BITS_42 default 3 if ARM64_64K_PAGES && ARM64_VA_BITS_48 default 3 if ARM64_4K_PAGES && ARM64_VA_BITS_39 @@ -391,6 +392,10 @@ choice space sizes. The level of translation table is determined by a combination of page size and virtual address space size. +config ARM64_VA_BITS_36 + bool "36-bit" + depends on ARM64_16K_PAGES + config ARM64_VA_BITS_39 bool "39-bit" depends on ARM64_4K_PAGES @@ -410,6 +415,7 @@ endchoice config ARM64_VA_BITS int + default 36 if ARM64_VA_BITS_36 default 39 if ARM64_VA_BITS_39 default 42 if ARM64_VA_BITS_42 default 47 if ARM64_VA_BITS_47 @@ -480,7 +486,7 @@ config ARCH_WANT_GENERAL_HUGETLB def_bool y config ARCH_WANT_HUGE_PMD_SHARE - def_bool y if ARM64_4K_PAGES || ARM64_16K_PAGES + def_bool y if ARM64_4K_PAGES || (ARM64_16K_PAGES && !ARM64_VA_BITS_36) config HAVE_ARCH_TRANSPARENT_HUGEPAGE def_bool y -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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