Re: [RFC PATCH 05/26] hugetlb: add CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING

[manish.mishra]

On 24/06/22 11:06 pm, James Houghton wrote:
> This adds the Kconfig to enable or disable high-granularity mapping. It
> is enabled by default for architectures that use
> ARCH_WANT_GENERAL_HUGETLB.
>
> There is also an arch-specific config ARCH_HAS_SPECIAL_HUGETLB_HGM which
> controls whether or not the architecture has been updated to support
> HGM if it doesn't use general HugeTLB.
>
> Signed-off-by: James Houghton <jthoughton@xxxxxxxxxx>
reviewed-by:manish.mishra@xxxxxxxxxxx
> ---
>   fs/Kconfig | 7 +++++++
>   1 file changed, 7 insertions(+)
>
> diff --git a/fs/Kconfig b/fs/Kconfig
> index 5976eb33535f..d76c7d812656 100644
> --- a/fs/Kconfig
> +++ b/fs/Kconfig
> @@ -268,6 +268,13 @@ config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON
>   	  to enable optimizing vmemmap pages of HugeTLB by default. It can then
>   	  be disabled on the command line via hugetlb_free_vmemmap=off.
>   
> +config ARCH_HAS_SPECIAL_HUGETLB_HGM
> +	bool
> +
> +config HUGETLB_HIGH_GRANULARITY_MAPPING
> +	def_bool ARCH_WANT_GENERAL_HUGETLB || ARCH_HAS_SPECIAL_HUGETLB_HGM
> +	depends on HUGETLB_PAGE
> +
>   config MEMFD_CREATE
>   	def_bool TMPFS || HUGETLBFS
>