[patch 2/2] x86_64: Configure stack size

[clameter@sgi.com]

[-- Attachment #1: x86_64_config_stack_size --]
[-- Type: text/plain, Size: 2621 bytes --]

Make the stack size configurable necessary. SGI NUMA configurations may need
more stack because cpumasks and nodemasks are at times kept on the stack.
This patch allows to run with 16k or 32k kernel stacks.

Cc: ak@suse.de
Cc: travis@sgi.com
Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
 arch/x86/Kconfig.x86_64          |    6 ++++++
 include/asm-x86/page_64.h        |    3 +--
 include/asm-x86/thread_info_64.h |    4 ++--
 3 files changed, 9 insertions(+), 4 deletions(-)

Index: linux-2.6/arch/x86/Kconfig.x86_64
===================================================================
--- linux-2.6.orig/arch/x86/Kconfig.x86_64	2007-11-06 12:34:13.000000000 -0800
+++ linux-2.6/arch/x86/Kconfig.x86_64	2007-11-06 15:44:36.000000000 -0800
@@ -378,6 +378,12 @@ config NODES_SHIFT
 	default "6"
 	depends on NEED_MULTIPLE_NODES
 
+config THREAD_ORDER
+	int "Kernel stack size (in page order)"
+	default "1"
+	help
+	  Page order for the thread stack.
+
 # Dummy CONFIG option to select ACPI_NUMA from drivers/acpi/Kconfig.
 
 config X86_64_ACPI_NUMA
Index: linux-2.6/include/asm-x86/page_64.h
===================================================================
--- linux-2.6.orig/include/asm-x86/page_64.h	2007-10-17 13:35:53.000000000 -0700
+++ linux-2.6/include/asm-x86/page_64.h	2007-11-06 15:44:36.000000000 -0800
@@ -9,8 +9,7 @@
 #define PAGE_MASK	(~(PAGE_SIZE-1))
 #define PHYSICAL_PAGE_MASK	(~(PAGE_SIZE-1) & __PHYSICAL_MASK)
 
-#define THREAD_ORDER 1 
-#define THREAD_SIZE  (PAGE_SIZE << THREAD_ORDER)
+#define THREAD_SIZE  (PAGE_SIZE << CONFIG_THREAD_ORDER)
 #define CURRENT_MASK (~(THREAD_SIZE-1))
 
 #define EXCEPTION_STACK_ORDER 0
Index: linux-2.6/include/asm-x86/thread_info_64.h
===================================================================
--- linux-2.6.orig/include/asm-x86/thread_info_64.h	2007-11-06 15:44:31.000000000 -0800
+++ linux-2.6/include/asm-x86/thread_info_64.h	2007-11-06 15:44:36.000000000 -0800
@@ -80,9 +80,9 @@ static inline struct thread_info *stack_
 #endif
 
 #define alloc_thread_info(tsk) \
-	((struct thread_info *) __get_free_pages(THREAD_FLAGS, THREAD_ORDER))
+	((struct thread_info *) __get_free_pages(THREAD_FLAGS, CONFIG_THREAD_ORDER))
 
-#define free_thread_info(ti) free_pages((unsigned long) (ti), THREAD_ORDER)
+#define free_thread_info(ti) free_pages((unsigned long) (ti), CONFIG_THREAD_ORDER)
 
 #else /* !__ASSEMBLY__ */
 

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