indications for oprofile in compact mode

[torez <lnxtorez@linux.vnet.ibm.com>]

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This patch allows Performance monitoring driver to detect when
operating in PowerPC compliance mode.

use patch -p0 to apply.

==========================================================================
diff -urN linux-2.6.26-rc7.orig/arch/powerpc/kernel/cputable.c linux-2.6.26-rc7/arch/powerpc/kernel/cputable.c
--- linux-2.6.26-rc7.orig/arch/powerpc/kernel/cputable.c	2008-07-07 11:37:40.000000000 -0500
+++ linux-2.6.26-rc7/arch/powerpc/kernel/cputable.c	2008-07-07 11:27:09.000000000 -0500
@@ -352,6 +352,7 @@
 		.icache_bsize		= 128,
 		.dcache_bsize		= 128,
 		.machine_check		= machine_check_generic,
+		.oprofile_cpu_type	= "ppc64/compat-power5+",
 		.platform		= "power5+",
 	},
 	{	/* Power6 */
@@ -383,6 +384,7 @@
 		.icache_bsize		= 128,
 		.dcache_bsize		= 128,
 		.machine_check		= machine_check_generic,
+		.oprofile_cpu_type	= "ppc64/compat-power6",
 		.platform		= "power6",
 	},
 	{	/* 2.06-compliant processor, i.e. Power7 "architected" mode */
@@ -394,6 +396,7 @@
 		.icache_bsize		= 128,
 		.dcache_bsize		= 128,
 		.machine_check		= machine_check_generic,
+		.oprofile_cpu_type	= "ppc64/compat-power7",
 		.platform		= "power7",
 	},
 	{	/* Power7 */
@@ -1593,6 +1596,12 @@
 			 * from the real PVR with a new value obtained
 			 * using a logical PVR value, don't modify the
 			 * performance monitor fields.
+			 * The performance monitor sub-system needs to have
+			 * access to the values from the real PVR, but, at 
+			 * the same time it needs to be aware it may be running
+			 * in compatibility mode. We we are changing the values
+			 * for the real PVR to those of the compatibility PVR,
+			 * change the oprofile_cpu_type field as well.
 			 */
 			if (t->num_pmcs && !s->num_pmcs) {
 				t->cpu_name = s->cpu_name;
@@ -1603,6 +1612,8 @@
 				t->cpu_setup = s->cpu_setup;
 				t->cpu_restore = s->cpu_restore;
 				t->platform = s->platform;
+				if (t->oprofile_cpu_type == NULL)
+					t->oprofile_cpu_type = s->oprofile_cpu_type;
 			} else
 				*t = *s;
 			*PTRRELOC(&cur_cpu_spec) = &the_cpu_spec;