linux-kernel - [PATCH 10/12] x86_64: make reserve_bootmem_generic to use new reserve

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Date:	Wed, 19 Mar 2008 14:04:48 -0700
From:	Yinghai Lu <yhlu.kernel.send@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Cc:	Christoph Lameter <clameter@....com>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: [PATCH 10/12] x86_64: make reserve_bootmem_generic to use new reserve_bootmem

[PATCH] x86_64: make reserve_bootmem_generic to use new reserve_bootmem

	[PATCH] mm: make reserve_bootmem can crossed the nodes

provides new resever_bootmem, let reserve_bootmem_generic use that.

acctualy reserve_bootme_generic is used to reserve initramdisk.
so we can make sure even bootloader or kexec load that cross the nodes, reserve_bootmem
still works.

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


Index: linux-2.6/arch/x86/mm/init_64.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/init_64.c
+++ linux-2.6/arch/x86/mm/init_64.c
@@ -648,7 +648,7 @@ void free_initrd_mem(unsigned long start
 void __init reserve_bootmem_generic(unsigned long phys, unsigned len)
 {
 #ifdef CONFIG_NUMA
-	int nid = phys_to_nid(phys);
+	int nid, next_nid;
 #endif
 	unsigned long pfn = phys >> PAGE_SHIFT;
 
@@ -667,10 +667,14 @@ void __init reserve_bootmem_generic(unsi
 
 	/* Should check here against the e820 map to avoid double free */
 #ifdef CONFIG_NUMA
+	nid = phys_to_nid(phys);
+	next_nid = phys_to_nid(phys + len - 1);
+	if (nid == next_nid)
 	reserve_bootmem_node(NODE_DATA(nid), phys, len, BOOTMEM_DEFAULT);
-#else
-	reserve_bootmem(phys, len, BOOTMEM_DEFAULT);
+	else
 #endif
+	reserve_bootmem(phys, len, BOOTMEM_DEFAULT);
+
 	if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) {
 		dma_reserve += len / PAGE_SIZE;
 		set_dma_reserve(dma_reserve);
--
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