linux-kernel - [tip:x86/mm] x86: add table start and end sanity checks to 32-bit init_memory

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Message-ID: <tip-d58e854e36ddf241ebc243e4122c5ab087bf38df@git.kernel.org>
Date:	Thu, 5 Mar 2009 13:37:42 GMT
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	yinghai@...nel.org, penberg@...helsinki.fi, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:x86/mm] x86: add table start and end sanity checks to 32-bit init_memory_mapping()

Commit-ID:  d58e854e36ddf241ebc243e4122c5ab087bf38df
Gitweb:     http://git.kernel.org/tip/d58e854e36ddf241ebc243e4122c5ab087bf38df
Author:     "Pekka Enberg" <penberg@...helsinki.fi>
AuthorDate: Thu, 5 Mar 2009 14:55:00 +0200
Commit:     Ingo Molnar <mingo@...e.hu>
CommitDate: Thu, 5 Mar 2009 14:17:14 +0100

x86: add table start and end sanity checks to 32-bit init_memory_mapping()

Impact: cleanup

This patch adds a sanity check to the 32-bit version of
init_memory_mapping() to reduce the diff to the 64-bit version.

Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>
Cc: Yinghai Lu <yinghai@...nel.org>
LKML-Reference: <1236257708-27269-9-git-send-email-penberg@...helsinki.fi>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 arch/x86/mm/init_32.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 00c1d85..0a3707f 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -1060,7 +1060,7 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
 
 	__flush_tlb_all();
 
-	if (!after_bootmem)
+	if (!after_bootmem && table_end > table_start)
 		reserve_early(table_start << PAGE_SHIFT,
 				 table_end << PAGE_SHIFT, "PGTABLE");
 
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