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


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