[RFC PATCH 07/09] robust VM per_cpu i386 VM area

[Steven Rostedt]

This patch allocates the percpu VM area using the fix addresses.
It defines currently 1 meg per cpu.

Signed-off-by: Steven Rostedt <rostedt at goodmis.org>

Index: linux-2.6.16-test/include/asm-i386/fixmap.h
===================================================================
--- linux-2.6.16-test.orig/include/asm-i386/fixmap.h	2006-05-17 04:32:27.000000000 -0400
+++ linux-2.6.16-test/include/asm-i386/fixmap.h	2006-05-17 04:59:34.000000000 -0400
@@ -32,6 +32,10 @@
 #include <asm/kmap_types.h>
 #endif

+/* One meg per cpu of VM space */
+#define PERCPU_PAGES 256
+#define PERCPU_SIZE (PERCPU_PAGES << PAGE_SHIFT)
+
 /*
  * Here we define all the compile-time 'special' virtual
  * addresses. The point is to have a constant address at
@@ -83,6 +87,8 @@ enum fixed_addresses {
 #ifdef CONFIG_PCI_MMCONFIG
 	FIX_PCIE_MCFG,
 #endif
+	FIX_PERCPU_BEGIN,
+	FIX_PERCPU_END = FIX_PERCPU_BEGIN+(PERCPU_PAGES*NR_CPUS)-1,
 	__end_of_permanent_fixed_addresses,
 	/* temporary boot-time mappings, used before ioremap() is functional */
 #define NR_FIX_BTMAPS	16