From: Bhavana Nagendra <bnagendr@redhat.com>
Subject: Re: RHEL5.1 [PATCH]: Fixes system panic during boot up with no memory 	in Node 0
Date: Wed, 20 Jun 2007 15:57:43 -0400
Bugzilla: 218641
Message-Id: <467986B7.1030603@redhat.com>
Changelog: [x86_64] Fixes system panic during boot up with no memory in Node 0


>>Linux always tries to allocate the GART/IOMMU aperture from the boot 
>>node memory, i.e node 0. 
>>However, it is legal to boot with no memory attached to the boot node, 
>>in which case the system
>>crashes with invalid memory assignments.  The attached patch generalize 
>>the memory allocation
>>to support any node in the system with memory.  
>>   
>>
>

--- linux-2.6.18.x86_64/arch/x86_64/kernel/aperture.c.fixnode0	2007-04-02 15:26:51.000000000 -0400
+++ linux-2.6.18.x86_64/arch/x86_64/kernel/aperture.c	2007-04-02 15:27:48.000000000 -0400
@@ -38,7 +38,6 @@ int fix_aperture __initdata = 1;
 
 static u32 __init allocate_aperture(void) 
 {
-	pg_data_t *nd0 = NODE_DATA(0);
 	u32 aper_size;
 	void *p; 
 
@@ -52,12 +51,12 @@ static u32 __init allocate_aperture(void
 	 * Unfortunately we cannot move it up because that would make the
 	 * IOMMU useless.
 	 */
-	p = __alloc_bootmem_node(nd0, aper_size, aper_size, 0); 
+	p = __alloc_bootmem_nopanic(aper_size, aper_size, 0);
 	if (!p || __pa(p)+aper_size > 0xffffffff) {
 		printk("Cannot allocate aperture memory hole (%p,%uK)\n",
 		       p, aper_size>>10);
 		if (p)
-			free_bootmem_node(nd0, __pa(p), aper_size); 
+			free_bootmem(__pa(p), aper_size);
 		return 0;
 	}
 	printk("Mapping aperture over %d KB of RAM @ %lx\n",