linux-kernel - [tip:x86/mm] x86/vdso32: Define PGTABLE

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Date:	Tue, 22 Sep 2015 12:42:33 -0700
From:	tip-bot for Toshi Kani <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	toshi.kani@....com, elliott@....com, mingo@...hat.com,
	mingo@...nel.org, linux-kernel@...r.kernel.org, jgross@...e.com,
	konrad.wilk@...cle.com, hpa@...or.com, tglx@...utronix.de,
	bp@...en8.de, akpm@...ux-foundation.org
Subject: [tip:x86/mm] x86/vdso32: Define PGTABLE_LEVELS to 32bit VDSO

Commit-ID:  fb535ccb30845fe0b7bd09caa37a838985b72ff9
Gitweb:     http://git.kernel.org/tip/fb535ccb30845fe0b7bd09caa37a838985b72ff9
Author:     Toshi Kani <toshi.kani@....com>
AuthorDate: Thu, 17 Sep 2015 12:24:14 -0600
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Tue, 22 Sep 2015 21:27:32 +0200

x86/vdso32: Define PGTABLE_LEVELS to 32bit VDSO

In case of CONFIG_X86_64, vdso32/vclock_gettime.c fakes a 32-bit
non-PAE kernel configuration by re-defining it to CONFIG_X86_32.
However, it does not re-define CONFIG_PGTABLE_LEVELS leaving it
as 4 levels.

This mismatch leads <asm/pgtable_type.h> to NOT include <asm-generic/
pgtable-nopud.h> and <asm-generic/pgtable-nopmd.h>, which will cause
compile errors when a later patch enhances <asm/pgtable_type.h> to
use PUD_SHIFT and PMD_SHIFT.  These -nopud & -nopmd headers define
these SHIFTs for the 32-bit non-PAE kernel.

Fix it by re-defining CONFIG_PGTABLE_LEVELS to 2 levels.

Signed-off-by: Toshi Kani <toshi.kani@....com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Juergen Gross <jgross@...e.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Konrad Wilk <konrad.wilk@...cle.com>
Cc: Robert Elliot <elliott@....com>
Cc: linux-mm@...ck.org
Link: http://lkml.kernel.org/r/1442514264-12475-2-git-send-email-toshi.kani@hpe.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/entry/vdso/vdso32/vclock_gettime.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/entry/vdso/vdso32/vclock_gettime.c b/arch/x86/entry/vdso/vdso32/vclock_gettime.c
index 175cc72..87a86e0 100644
--- a/arch/x86/entry/vdso/vdso32/vclock_gettime.c
+++ b/arch/x86/entry/vdso/vdso32/vclock_gettime.c
@@ -14,11 +14,13 @@
  */
 #undef CONFIG_64BIT
 #undef CONFIG_X86_64
+#undef CONFIG_PGTABLE_LEVELS
 #undef CONFIG_ILLEGAL_POINTER_VALUE
 #undef CONFIG_SPARSEMEM_VMEMMAP
 #undef CONFIG_NR_CPUS
 
 #define CONFIG_X86_32 1
+#define CONFIG_PGTABLE_LEVELS 2
 #define CONFIG_PAGE_OFFSET 0
 #define CONFIG_ILLEGAL_POINTER_VALUE 0
 #define CONFIG_NR_CPUS 1
--
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