1 files changed, 22 insertions, 9 deletions

diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index d053bf4759e4..8e9fbe75894e 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -29,6 +29,7 @@
 #include <linux/notifier.h>
 #include <linux/kdb.h>
 #include <linux/irq.h>
+#include <linux/perf_event.h>
 
 #include <asm/bootinfo.h>
 #include <asm/branch.h>
@@ -576,10 +577,16 @@ static inline int simulate_sc(struct pt_regs *regs, unsigned int opcode)
  */
 static int simulate_llsc(struct pt_regs *regs, unsigned int opcode)
 {
-        if ((opcode & OPCODE) == LL)
+        if ((opcode & OPCODE) == LL) {
+                perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
+                                1, 0, regs, 0);
                 return simulate_ll(regs, opcode);
-        if ((opcode & OPCODE) == SC)
+        }
+        if ((opcode & OPCODE) == SC) {
+                perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
+                                1, 0, regs, 0);
                 return simulate_sc(regs, opcode);
+        }
 
         return -1;                      /* Must be something else ... */
 }
@@ -595,6 +602,8 @@ static int simulate_rdhwr(struct pt_regs *regs, unsigned int opcode)
         if ((opcode & OPCODE) == SPEC3 && (opcode & FUNC) == RDHWR) {
                 int rd = (opcode & RD) >> 11;
                 int rt = (opcode & RT) >> 16;
+                perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
+                                1, 0, regs, 0);
                 switch (rd) {
                 case 0:         /* CPU number */
                         regs->regs[rt] = smp_processor_id();
@@ -630,8 +639,11 @@ static int simulate_rdhwr(struct pt_regs *regs, unsigned int opcode)
 
 static int simulate_sync(struct pt_regs *regs, unsigned int opcode)
 {
-        if ((opcode & OPCODE) == SPEC0 && (opcode & FUNC) == SYNC)
+        if ((opcode & OPCODE) == SPEC0 && (opcode & FUNC) == SYNC) {
+                perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS,
+                                1, 0, regs, 0);
                 return 0;
+        }
 
         return -1;                      /* Must be something else ... */
 }
@@ -1469,6 +1481,7 @@ void __cpuinit per_cpu_trap_init(void)
 {
         unsigned int cpu = smp_processor_id();
         unsigned int status_set = ST0_CU0;
+        unsigned int hwrena = cpu_hwrena_impl_bits;
 #ifdef CONFIG_MIPS_MT_SMTC
         int secondaryTC = 0;
         int bootTC = (cpu == 0);
@@ -1501,14 +1514,14 @@ void __cpuinit per_cpu_trap_init(void)
         change_c0_status(ST0_CU|ST0_MX|ST0_RE|ST0_FR|ST0_BEV|ST0_TS|ST0_KX|ST0_SX|ST0_UX,
                          status_set);
 
-        if (cpu_has_mips_r2) {
-                unsigned int enable = 0x0000000f | cpu_hwrena_impl_bits;
+        if (cpu_has_mips_r2)
+                hwrena |= 0x0000000f;
 
-                if (!noulri && cpu_has_userlocal)
-                        enable |= (1 << 29);
+        if (!noulri && cpu_has_userlocal)
+                hwrena |= (1 << 29);
 
-                write_c0_hwrena(enable);
-        }
+        if (hwrena)
+                write_c0_hwrena(hwrena);
 
 #ifdef CONFIG_MIPS_MT_SMTC
         if (!secondaryTC) {