Re: [PATCHv3 05/11] arm64: Handle 4 level page table for swapper

From	Mark Rutland <mark.rutland@arm.com>
Newsgroups	linux.kernel
Subject	Re: [PATCHv3 05/11] arm64: Handle 4 level page table for swapper
Date	2015-10-14 19:20 +0200
Message-ID	<qjxSy-58q-19@gated-at.bofh.it> (permalink)
References	<qjspQ-5qz-3@gated-at.bofh.it> <qjspS-5qz-61@gated-at.bofh.it>
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On Wed, Oct 14, 2015 at 12:20:28PM +0100, Suzuki K. Poulose wrote:
> At the moment, we only support maximum of 3-level page table for
> swapper. With 48bit VA, 64K has only 3 levels and 4K uses section
> mapping. Add support for 4-level page table for swapper, needed
> by 16K pages.
> 
> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will.deacon@arm.com>
> Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> ---
>  arch/arm64/kernel/head.S |    5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
> index 149fce3..7ace955 100644
> --- a/arch/arm64/kernel/head.S
> +++ b/arch/arm64/kernel/head.S
> @@ -271,7 +271,10 @@ ENDPROC(preserve_boot_args)
>   */
>  	.macro	create_pgd_entry, tbl, virt, tmp1, tmp2
>  	create_table_entry \tbl, \virt, PGDIR_SHIFT, PTRS_PER_PGD, \tmp1, \tmp2
> -#if SWAPPER_PGTABLE_LEVELS == 3
> +#if SWAPPER_PGTABLE_LEVELS > 3
> +	create_table_entry \tbl, \virt, PUD_SHIFT, PTRS_PER_PUD, \tmp1, \tmp2
> +#endif
> +#if SWAPPER_PGTABLE_LEVELS > 2
>  	create_table_entry \tbl, \virt, SWAPPER_TABLE_SHIFT, PTRS_PER_PTE, \tmp1, \tmp2
>  #endif
>  	.endm

Acked-by: Mark Rutland <mark.rutland@arm.com>

Thanks,
Mark.
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[PATCHv3 00/11] arm64: 16K translation granule support "Suzuki K. Poulose" <suzuki.poulose@arm.com> - 2015-10-14 13:30 +0200
  [PATCHv3 07/11] arm64: Kconfig: Fix help text about AArch32 support with 64K pages "Suzuki K. Poulose" <suzuki.poulose@arm.com> - 2015-10-14 13:30 +0200
    Re: [PATCHv3 07/11] arm64: Kconfig: Fix help text about AArch32  support with 64K pages Mark Rutland <mark.rutland@arm.com> - 2015-10-14 19:20 +0200
  [PATCHv3 10/11] arm64: Add 16K page size support "Suzuki K. Poulose" <suzuki.poulose@arm.com> - 2015-10-14 13:30 +0200
    Re: [PATCHv3 10/11] arm64: Add 16K page size support Jeremy Linton <jeremy.linton@arm.com> - 2015-10-14 17:50 +0200
      Re: [PATCHv3 10/11] arm64: Add 16K page size support "Suzuki K. Poulose" <Suzuki.Poulose@arm.com> - 2015-10-14 18:00 +0200
    Re: [PATCHv3 10/11] arm64: Add 16K page size support Mark Rutland <mark.rutland@arm.com> - 2015-10-15 16:10 +0200
      Re: [PATCHv3 10/11] arm64: Add 16K page size support "Suzuki K. Poulose" <Suzuki.Poulose@arm.com> - 2015-10-15 16:50 +0200
        Re: [PATCHv3 10/11] arm64: Add 16K page size support Steve Capper <steve.capper@linaro.org> - 2015-10-15 17:40 +0200
          Re: [PATCHv3 10/11] arm64: Add 16K page size support "Suzuki K. Poulose" <Suzuki.Poulose@arm.com> - 2015-10-15 17:50 +0200
  [PATCHv3 05/11] arm64: Handle 4 level page table for swapper "Suzuki K. Poulose" <suzuki.poulose@arm.com> - 2015-10-14 13:30 +0200
    Re: [PATCHv3 05/11] arm64: Handle 4 level page table for swapper Mark Rutland <mark.rutland@arm.com> - 2015-10-14 19:20 +0200

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