We use pte_range_none() to determine whether contiguous PTEs are empty
for an mTHP allocation. Instead of iterating the while loop for every
order, use some information from the previous iteration to eliminate
some cases.

v1->v2:
 - Break into two patches

v1: https://lore.kernel.org/all/20240913091902.1160520-1-dev.jain@arm.com/

Dev Jain (2):
  mm: Make pte_range_none() return number of empty PTEs
  mm: Compute first_set_pte to eliminate evaluating redundant ranges

 mm/memory.c | 30 +++++++++++++++++++++++-------
 1 file changed, 23 insertions(+), 7 deletions(-)

-- 
2.30.2