diff --git a/arch/parisc/kernel/perf.c b/arch/parisc/kernel/perf.c
index f6fec62..79dcbcc 100644
--- a/arch/parisc/kernel/perf.c
+++ b/arch/parisc/kernel/perf.c
@@ -66,10 +66,10 @@
 	uint8_t		write_control;
 };
 
-static int perf_processor_interface = UNKNOWN_INTF;
-static int perf_enabled = 0;
+static int perf_processor_interface __read_mostly = UNKNOWN_INTF;
+static int perf_enabled __read_mostly = 0;
 static spinlock_t perf_lock;
-struct parisc_device *cpu_device = NULL;
+struct parisc_device *cpu_device __read_mostly = NULL;
 
 /* RDRs to write for PCX-W */
 static int perf_rdrs_W[] =