From: Nicolas Pitre <nico@cam.org>
Date: Wed, 18 Feb 2009 21:29:22 +0000 (+0100)
Subject: [ARM] 5402/1: fix a case of wrap-around in sanity_check_meminfo()
X-Git-Tag: firefly_0821_release~15491^2~4
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=3fd9825c42c784a59b3b90bdf073f49d4bb42a8d;p=firefly-linux-kernel-4.4.55.git

[ARM] 5402/1: fix a case of wrap-around in sanity_check_meminfo()

In the non highmem case, if two memory banks of 1GB each are provided,
the second bank would evade suppression since its virtual base would
be 0.  Fix this by disallowing any memory bank which virtual base
address is found to be lower than PAGE_OFFSET.

Reported-by: Lennert Buytenhek <buytenh@marvell.com>

Signed-off-by: Nicolas Pitre <nico@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 9b36c5cb5e9f..d4d082c5c2d4 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -693,7 +693,8 @@ static void __init sanity_check_meminfo(void)
 		 * Check whether this memory bank would entirely overlap
 		 * the vmalloc area.
 		 */
-		if (__va(bank->start) >= VMALLOC_MIN) {
+		if (__va(bank->start) >= VMALLOC_MIN ||
+		    __va(bank->start) < PAGE_OFFSET) {
 			printk(KERN_NOTICE "Ignoring RAM at %.8lx-%.8lx "
 			       "(vmalloc region overlap).\n",
 			       bank->start, bank->start + bank->size - 1);