powerpc/cpumask: Add DEBUG_PER_CPU_MAPS option

Enable the DEBUG_PER_CPU_MAPS option so we can look for problems with
cpumasks .

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug
index 5cdd7ed9a12e..53696da4518f 100644
--- a/arch/powerpc/Kconfig.debug
+++ b/arch/powerpc/Kconfig.debug
@@ -44,6 +44,18 @@ config DEBUG_STACK_USAGE
 
           This option will slow down process creation somewhat.
 
+config DEBUG_PER_CPU_MAPS
+        bool "Debug access to per_cpu maps"
+        depends on DEBUG_KERNEL
+        depends on SMP
+        default n
+        ---help---
+          Say Y to verify that the per_cpu map being accessed has
+          been setup.  Adds a fair amount of code to kernel memory
+          and decreases performance.
+
+          Say N if unsure.
+
 config HCALL_STATS
         bool "Hypervisor call instrumentation"
         depends on PPC_PSERIES && DEBUG_FS && TRACEPOINTS