1 files changed, 11 insertions, 0 deletions

diff --git a/include/asm-powerpc/paca.h b/include/asm-powerpc/paca.h
index c6a5b1735666..fcd7b428ed0b 100644
--- a/include/asm-powerpc/paca.h
+++ b/include/asm-powerpc/paca.h
@@ -21,7 +21,18 @@
 #include        <asm/mmu.h>
 
 register struct paca_struct *local_paca asm("r13");
+
+#if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
+extern unsigned int debug_smp_processor_id(void); /* from linux/smp.h */
+/*
+ * Add standard checks that preemption cannot occur when using get_paca():
+ * otherwise the paca_struct it points to may be the wrong one just after.
+ */
+#define get_paca()      ((void) debug_smp_processor_id(), local_paca)
+#else
 #define get_paca()      local_paca
+#endif
+
 #define get_lppaca()    (get_paca()->lppaca_ptr)
 #define get_slb_shadow()        (get_paca()->slb_shadow_ptr)