[PATCH] mm: add nr_pmds into mm_struct unconditionally

[Kirill A. Shutemov]

__PAGETABLE_PMD_FOLDED is defined during <asm/pgtable.h> which is not
included into <linux/mm_types.h>. And we cannot include it here since
many of <asm/pgtables> needs <linux/mm_types.h> to define struct page.

I failed to come up with better solution rather than put nr_pmds into
mm_struct unconditionally.

One possible solution would be to expose number of page table levels
architecture has via Kconfig, but that's ugly and requires changes to
all architectures.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
---
 include/linux/mm_types.h | 2 --
 1 file changed, 2 deletions(-)

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 79cdf6f5c746..199a03aab8dc 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -364,9 +364,7 @@ struct mm_struct {
 	atomic_t mm_users;			/* How many users with user space? */
 	atomic_t mm_count;			/* How many references to "struct mm_struct" (users count as 1) */
 	atomic_long_t nr_ptes;			/* PTE page table pages */
-#ifndef __PAGETABLE_PMD_FOLDED
 	atomic_long_t nr_pmds;			/* PMD page table pages */
-#endif
 	int map_count;				/* number of VMAs */
 
 	spinlock_t page_table_lock;		/* Protects page tables and some counters */
-- 
 Kirill A. Shutemov
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