linux-kernel - [PATCH] Prevent reserving RAM in the region already reserved by BIOS

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Message-ID: <AANLkTimwxXtNnmBuDJxg3i72VwWuHmemjrr1iGqj4j8e@mail.gmail.com>
Date:	Tue, 18 May 2010 22:35:30 -0700
From:	Mathieu Rondonneau <mathieu.rondonneau@...il.com>
To:	yinghai@...nel.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Cc:	Me <mathieu.rondonneau@...il.com>
Subject: [PATCH] Prevent reserving RAM in the region already reserved by BIOS

Does it make sense to prevent looking for stolen RAM below the ISA section.


Signed-off-by: Mathieu Rondonneau <mathieu.rondonneau@...il.com>
---
 arch/x86/kernel/e820.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 7bca3c6..322c9c3 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -1156,6 +1156,8 @@ void __init e820_reserve_resources_late(void)
                        end = MAX_RESOURCE_SIZE;
                if (start >= end)
                        continue;
+               if (end < ISA_START_ADDRESS)
+                       continue;
                printk(KERN_DEBUG "reserve RAM buffer: %016llx - %016llx ",
                               start, end);
                reserve_region_with_split(&iomem_resource, start, end,
-- 
1.6.3.3
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