To get the kernel compiled with instrumentation turned on, I had to
apply the patch below. 

It looks to me like x86 and x86-64 were just left out when the
Kconfig.instrumentation file was created, but maybe I am
misunderstanding how the x86/x86-64 merge is supposed to work.

Soren

Signed-off-by: Soren Sandmann <sandmann@redhat.com>
---
 arch/i386/Kconfig   |    2 ++
 arch/x86_64/Kconfig |    2 ++
 2 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index f6e44fc..b54a82d 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -1266,6 +1266,8 @@ source "crypto/Kconfig"
 
 source "lib/Kconfig"
 
+source "kernel/Kconfig.instrumentation"
+
 #
 # Use the generic interrupt handling code in kernel/irq/:
 #
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index aab25f3..a68865b 100644
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -808,3 +808,5 @@ source "security/Kconfig"
 source "crypto/Kconfig"
 
 source "lib/Kconfig"
+
+source "kernel/Kconfig.instrumentation"
-- 
1.5.2.4

-
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