linux-kernel - [tip:x86/urgent] x86, memblock: Fix early_node

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Message-ID: <tip-419db274bed4269f475a8e78cbe9c917192cfe8b@git.kernel.org>
Date:	Thu, 28 Oct 2010 23:40:12 GMT
From:	tip-bot for Yinghai Lu <yinghai@...nel.org>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, jeremy@...p.org, hpa@...or.com,
	mingo@...hat.com, konrad.wilk@...cle.com, yinghai@...nel.org,
	tglx@...utronix.de, hpa@...ux.intel.com
Subject: [tip:x86/urgent] x86, memblock: Fix early_node_mem with big reserved region.

Commit-ID:  419db274bed4269f475a8e78cbe9c917192cfe8b
Gitweb:     http://git.kernel.org/tip/419db274bed4269f475a8e78cbe9c917192cfe8b
Author:     Yinghai Lu <yinghai@...nel.org>
AuthorDate: Thu, 28 Oct 2010 09:50:17 -0700
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Thu, 28 Oct 2010 15:52:36 -0700

x86, memblock: Fix early_node_mem with big reserved region.

Xen can reserve huge amounts of memory for pre-ballooning, but that
still shows as RAM in the e820 memory map.  early_node_mem could not
find range because of start/end adjusting, and will go through the
fallback path.  However, the fallback patch is still using
memblock_x86_find_range_node(), and it is partially top-down because
it go through active_range entries from low to high.

Let's use memblock_find_in_range instead memblock_x86_find_range_node.
So get real top down in fallback path.

We may still need to make memblock_x86_find_range_node to do overall
top_down work.

Reported-by: Jeremy Fitzhardinge <jeremy@...p.org>
Tested-by: Jeremy Fitzhardinge <jeremy@...p.org>
Tested-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
LKML-Reference: <4CC9A9C9.8020700@...nel.org>
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
 arch/x86/mm/numa_64.c |    7 ++-----
 1 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/arch/x86/mm/numa_64.c b/arch/x86/mm/numa_64.c
index 60f4985..7ffc9b7 100644
--- a/arch/x86/mm/numa_64.c
+++ b/arch/x86/mm/numa_64.c
@@ -178,11 +178,8 @@ static void * __init early_node_mem(int nodeid, unsigned long start,
 
 	/* extend the search scope */
 	end = max_pfn_mapped << PAGE_SHIFT;
-	if (end > (MAX_DMA32_PFN<<PAGE_SHIFT))
-		start = MAX_DMA32_PFN<<PAGE_SHIFT;
-	else
-		start = MAX_DMA_PFN<<PAGE_SHIFT;
-	mem = memblock_x86_find_in_range_node(nodeid, start, end, size, align);
+	start = MAX_DMA_PFN << PAGE_SHIFT;
+	mem = memblock_find_in_range(start, end, size, align);
 	if (mem != MEMBLOCK_ERROR)
 		return __va(mem);
 
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