linux-kernel - [PATCH] x86: max_low_pfn

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Date:	Sun, 13 Jul 2008 14:29:41 -0700
From:	Yinghai Lu <yhlu.kernel@...il.com>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: max_low_pfn_mapped fix #4


	only add direct mapping for aperture

Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>

---
 arch/x86/kernel/pci-gart_64.c |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

Index: linux-2.6/arch/x86/kernel/pci-gart_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/pci-gart_64.c
+++ linux-2.6/arch/x86/kernel/pci-gart_64.c
@@ -680,11 +680,8 @@ static __init int init_k8_gatt(struct ag
 	/* need to map that range */
 	end_pfn = (aper_base>>PAGE_SHIFT) + (aper_size>>PAGE_SHIFT);
 	if (end_pfn > max_low_pfn_mapped) {
-		start_pfn = max_low_pfn_mapped;
-		max_low_pfn_mapped = init_memory_mapping(start_pfn<<PAGE_SHIFT,
-							 end_pfn<<PAGE_SHIFT);
-		if (max_pfn_mapped < max_low_pfn_mapped)
-			max_pfn_mapped = max_low_pfn_mapped;
+		start_pfn = (aper_base>>PAGE_SHIFT);
+		init_memory_mapping(start_pfn<<PAGE_SHIFT, end_pfn<<PAGE_SHIFT);
 	}
 	return 0;
 
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