[PATCH] parisc: fix pmd accounting with 3-level page tables

["Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>]

There's hack in pgd_alloc() on parisc to initialize one pmd, which is
not accounted. It leads to underflow on exit.

Let's adjust nr_pmds on pgd_alloc() to get accounting correct.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: John David Anglin <dave.anglin@bell.net>
Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: Graham Gower <graham.gower@gmail.com>
Cc: Domenico Andreoli <cavokz@gmail.com>
---
 arch/parisc/include/asm/pgalloc.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/parisc/include/asm/pgalloc.h b/arch/parisc/include/asm/pgalloc.h
index 55ad8be9b7f3..068b2fb9a47c 100644
--- a/arch/parisc/include/asm/pgalloc.h
+++ b/arch/parisc/include/asm/pgalloc.h
@@ -38,6 +38,7 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm)
 		/* The first pmd entry also is marked with _PAGE_GATEWAY as
 		 * a signal that this pmd may not be freed */
 		__pgd_val_set(*pgd, PxD_FLAG_ATTACHED);
+		mm_inc_nr_pmds(mm);
 #endif
 	}
 	return actual_pgd;
-- 
2.1.4

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>