mm: optimize mprotect() for MM_CP_PROT_NUMA by batch-skipping PTEs

For the MM_CP_PROT_NUMA skipping case, observe that, if we skip an
iteration due to the underlying folio satisfying any of the skip
conditions, then for all subsequent ptes which map the same folio, the
iteration will be skipped for them too.  Therefore, we can optimize by
using folio_pte_batch() to batch skip the iterations.

Use prot_numa_skip() introduced in the previous patch to determine whether
we need to skip the iteration.  Change its signature to have a double
pointer to a folio, which will be used by mprotect_folio_pte_batch() to
determine the number of iterations we can safely skip.

Link: https://lkml.kernel.org/r/20250718090244.21092-3-dev.jain@arm.com


Signed-off-by: Dev Jain <dev.jain@arm.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jann Horn <jannh@google.com>
Cc: Joey Gouly <joey.gouly@arm.com>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Lance Yang <ioworker0@gmail.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Will Deacon <will@kernel.org>
Cc: Yang Shi <yang@os.amperecomputing.com>
Cc: Yicong Yang <yangyicong@hisilicon.com>
Cc: Zhenhua Huang <quic_zhenhuah@quicinc.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>