[PATCH v7 6/6] arm64: mm: Optimize linear_map_split_to_ptes()

[Catalin Marinas]

On Fri, Aug 29, 2025 at 12:52:47PM +0100, Ryan Roberts wrote:
> When splitting kernel leaf mappings, either via
> split_kernel_leaf_mapping_locked() or linear_map_split_to_ptes(),
> previously a leaf mapping was always split to the next size down. e.g.
> pud -> contpmd -> pmd -> contpte -> pte. But for
> linear_map_split_to_ptes() we can avoid the contpmd and contpte states
> because we know we want to split all the way down to ptes.
> 
> This avoids visiting all the ptes in a table if it was created by
> splitting a pmd, which is noticible on systems with a lot of memory.
> 
> Signed-off-by: Ryan Roberts <ryan.roberts at arm.com>

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