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mm: introduce wrappers to access mm->nr_ptes

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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>
This commit is contained in:
Kirill A. Shutemov
2017-11-15 17:35:37 -08:00
committed by Linus Torvalds
parent b4e98d9ac7
commit c4812909f5
12 changed files with 54 additions and 21 deletions
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6
kernel/fork.c
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@@ -817,7 +817,7 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p,
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 @@ static void check_mm(struct mm_struct *mm)
"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));