linux-kernel - [PATCH 16/19] um: expose number of page table levels

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Date:	Fri, 30 Jan 2015 16:43:25 +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,
	Guenter Roeck <linux@...ck-us.net>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Jeff Dike <jdike@...toit.com>,
	Richard Weinberger <richard@....at>
Subject: [PATCH 16/19] um: expose number of page table levels

We would want to use number of page table level to define mm_struct.
Let's expose it as CONFIG_PGTABLE_LEVELS.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Cc: Jeff Dike <jdike@...toit.com>
Cc: Richard Weinberger <richard@....at>
---
 arch/um/Kconfig.um | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/um/Kconfig.um b/arch/um/Kconfig.um
index a7520c90f62d..5dbfe3d9107c 100644
--- a/arch/um/Kconfig.um
+++ b/arch/um/Kconfig.um
@@ -155,3 +155,8 @@ config MMAPPER
 
 config NO_DMA
 	def_bool y
+
+config PGTABLE_LEVELS
+	int
+	default 3 if 3_LEVEL_PGTABLES
+	default 2
-- 
2.1.4

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