[PATCH v6 10/18] arm64/mm: New ptep layer to manage contig bit

[Catalin Marinas]

On Thu, Feb 15, 2024 at 10:31:57AM +0000, Ryan Roberts wrote:
> Create a new layer for the in-table PTE manipulation APIs. For now, The
> existing API is prefixed with double underscore to become the
> arch-private API and the public API is just a simple wrapper that calls
> the private API.
> 
> The public API implementation will subsequently be used to transparently
> manipulate the contiguous bit where appropriate. But since there are
> already some contig-aware users (e.g. hugetlb, kernel mapper), we must
> first ensure those users use the private API directly so that the future
> contig-bit manipulations in the public API do not interfere with those
> existing uses.
> 
> The following APIs are treated this way:
> 
>  - ptep_get
>  - set_pte
>  - set_ptes
>  - pte_clear
>  - ptep_get_and_clear
>  - ptep_test_and_clear_young
>  - ptep_clear_flush_young
>  - ptep_set_wrprotect
>  - ptep_set_access_flags
> 
> Tested-by: John Hubbard <jhubbard at nvidia.com>
> Signed-off-by: Ryan Roberts <ryan.roberts at arm.com>

Acked-by: Catalin Marinas <catalin.marinas at arm.com>