linux-kernel - Re: [PATCH] x86: fix bootmem cross node for 32bit numa -v2

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Date:	Wed, 04 Mar 2009 12:21:24 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: fix bootmem cross node for 32bit numa -v2

Ingo Molnar wrote:
> * Yinghai Lu <yinghai@...nel.org> wrote:
> 
>> Imapct: fix panic on system 2g x4 sockets
>>
>> Found one system with 4 sockets and every sockets has 2g can boot with numa32
>> because boot mem is crossing nodes.
>>
>> so try to have numa version setup_bootmem_allocator
>> v2: simplify the code
> 
> i've already applied v1 - mind sending the simplification as a 
> delta patch? Thanks.
> 

please check

[PATCH] x86: fix bootmem cross node for 32bit numa - fixup

Imapct: clean up

simplify the code, reuse some lines.
remove min_low_pfn referring, it is always 0

Signed-off-by: Yinghai Lu <yinghai@...nel.org>

---
 arch/x86/mm/init_32.c |   16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

Index: linux-2.6/arch/x86/mm/init_32.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/init_32.c
+++ linux-2.6/arch/x86/mm/init_32.c
@@ -776,7 +776,6 @@ static void __init zone_sizes_init(void)
 	free_area_init_nodes(max_zone_pfns);
 }
 
-#ifdef CONFIG_NEED_MULTIPLE_NODES
 static unsigned long __init setup_node_bootmem(int nodeid,
 				 unsigned long start_pfn,
 				 unsigned long end_pfn,
@@ -802,7 +801,6 @@ static unsigned long __init setup_node_b
 
 	return bootmap + bootmap_size;
 }
-#endif
 
 void __init setup_bootmem_allocator(void)
 {
@@ -812,8 +810,7 @@ void __init setup_bootmem_allocator(void
 	 * Initialize the boot-time allocator (with low memory only):
 	 */
 	bootmap_size = bootmem_bootmap_pages(max_low_pfn)<<PAGE_SHIFT;
-	bootmap = find_e820_area(min_low_pfn<<PAGE_SHIFT,
-				 max_pfn_mapped<<PAGE_SHIFT, bootmap_size,
+	bootmap = find_e820_area(0, max_pfn_mapped<<PAGE_SHIFT, bootmap_size,
 				 PAGE_SIZE);
 	if (bootmap == -1L)
 		panic("Cannot find bootmem map of size %ld\n", bootmap_size);
@@ -821,21 +818,14 @@ void __init setup_bootmem_allocator(void
 
 	printk(KERN_INFO "  mapped low ram: 0 - %08lx\n",
 		 max_pfn_mapped<<PAGE_SHIFT);
-	printk(KERN_INFO "  low ram: %08lx - %08lx\n",
-		 min_low_pfn<<PAGE_SHIFT, max_low_pfn<<PAGE_SHIFT);
+	printk(KERN_INFO "  low ram: 0 - %08lx\n", max_low_pfn<<PAGE_SHIFT);
 
 #ifdef CONFIG_NEED_MULTIPLE_NODES
 	for_each_online_node(nodeid)
 		bootmap = setup_node_bootmem(nodeid, node_start_pfn[nodeid],
 					node_end_pfn[nodeid], bootmap);
 #else
-	/* don't touch min_low_pfn */
-	bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap >> PAGE_SHIFT,
-					 min_low_pfn, max_low_pfn);
-	printk(KERN_INFO "  bootmap %08lx - %08lx\n",
-		 bootmap, bootmap + bootmap_size);
-	free_bootmem_with_active_regions(0, max_low_pfn);
-	early_res_to_bootmem(0, max_low_pfn<<PAGE_SHIFT);
+	bootmap = setup_node_bootmem(0, 0, max_low_pfn, bootmap);
 #endif
 
 	after_init_bootmem = 1;
--
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