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

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Date:	Fri, 13 Mar 2015 12:30:02 +0200
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linux-parisc@...r.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	John David Anglin <dave.anglin@...l.net>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Graham Gower <graham.gower@...il.com>,
	Domenico Andreoli <cavokz@...il.com>
Subject: [PATCH] parisc: fix pmd accounting with 3-level page tables

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@...ux.intel.com>
Cc: John David Anglin <dave.anglin@...l.net>
Cc: Aaro Koskinen <aaro.koskinen@....fi>
Cc: Graham Gower <graham.gower@...il.com>
Cc: Domenico Andreoli <cavokz@...il.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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