mm: introduce wrappers to access mm->nr_ptes
Let's add wrappers for ->nr_ptes with the same interface as for nr_pmd
and nr_pud.
The patch also makes nr_ptes accounting dependent onto CONFIG_MMU. Page
table accounting doesn't make sense if you don't have page tables.
It's preparation for consolidation of page-table counters in mm_struct.
Link: http://lkml.kernel.org/r/20171006100651.44742-1-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/kernel/fork.c b/kernel/fork.c
index a4eb6f2..946922a 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -817,7 +817,7 @@
init_rwsem(&mm->mmap_sem);
INIT_LIST_HEAD(&mm->mmlist);
mm->core_state = NULL;
- atomic_long_set(&mm->nr_ptes, 0);
+ mm_nr_ptes_init(mm);
mm_nr_pmds_init(mm);
mm_nr_puds_init(mm);
mm->map_count = 0;
@@ -873,9 +873,9 @@
"mm:%p idx:%d val:%ld\n", mm, i, x);
}
- if (atomic_long_read(&mm->nr_ptes))
+ if (mm_nr_ptes(mm))
pr_alert("BUG: non-zero nr_ptes on freeing mm: %ld\n",
- atomic_long_read(&mm->nr_ptes));
+ mm_nr_ptes(mm));
if (mm_nr_pmds(mm))
pr_alert("BUG: non-zero nr_pmds on freeing mm: %ld\n",
mm_nr_pmds(mm));