linux-kernel - [PATCH 4/4] Define memory_block_size_bytes for x86_64 with CONFIG_X86

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Date:	Thu, 20 Jan 2011 10:46:15 -0600
From:	Nathan Fontenot <nfont@...tin.ibm.com>
To:	Greg KH <greg@...ah.com>
CC:	linux-mm@...ck.org, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Robin Holt <holt@....com>
Subject: [PATCH 4/4] Define memory_block_size_bytes for x86_64 with CONFIG_X86_UV

Define a version of memory_block_size_bytes for x86_64 when CONFIG_X86_UV is
set.

Signed-off-by: Robin Holt <holt@....com>
Signed-off-by: Jack Steiner <steiner@....com>
Signed-off-by: Nathan Fontenot <nfont@...tin.ibm.com>

---
 arch/x86/mm/init_64.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

Index: linux-2.6/arch/x86/mm/init_64.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/init_64.c	2011-01-20 08:18:20.000000000 -0600
+++ linux-2.6/arch/x86/mm/init_64.c	2011-01-20 08:21:10.000000000 -0600
@@ -51,6 +51,7 @@
 #include <asm/numa.h>
 #include <asm/cacheflush.h>
 #include <asm/init.h>
+#include <asm/uv/uv.h>
 
 static int __init parse_direct_gbpages_off(char *arg)
 {
@@ -908,6 +909,19 @@ const char *arch_vma_name(struct vm_area
 	return NULL;
 }
 
+#ifdef CONFIG_X86_UV
+#define MIN_MEMORY_BLOCK_SIZE   (1 << SECTION_SIZE_BITS)
+
+unsigned long memory_block_size_bytes(void)
+{
+	if (is_uv_system()) {
+		printk(KERN_INFO "UV: memory block size 2GB\n");
+		return 2UL * 1024 * 1024 * 1024;
+	}
+	return MIN_MEMORY_BLOCK_SIZE;
+}
+#endif
+
 #ifdef CONFIG_SPARSEMEM_VMEMMAP
 /*
  * Initialise the sparsemem vmemmap using huge-pages at the PMD level.


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