1 files changed, 22 insertions, 7 deletions

diff --git a/arch/sh/kernel/traps_32.c b/arch/sh/kernel/traps_32.c
index c3d86fa71ddf..3484c2f65aba 100644
--- a/arch/sh/kernel/traps_32.c
+++ b/arch/sh/kernel/traps_32.c
@@ -5,7 +5,7 @@
  *  SuperH version: Copyright (C) 1999 Niibe Yutaka
  *                  Copyright (C) 2000 Philipp Rumpf
  *                  Copyright (C) 2000 David Howells
- *                  Copyright (C) 2002 - 2007 Paul Mundt
+ *                  Copyright (C) 2002 - 2010 Paul Mundt
  *
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
@@ -26,6 +26,7 @@
 #include <linux/limits.h>
 #include <linux/sysfs.h>
 #include <linux/uaccess.h>
+#include <linux/perf_event.h>
 #include <asm/system.h>
 #include <asm/alignment.h>
 #include <asm/fpu.h>
@@ -369,7 +370,8 @@ static inline int handle_delayslot(struct pt_regs *regs,
 #define SH_PC_12BIT_OFFSET(instr) ((((signed short)(instr<<4))>>3) + 4)
 
 int handle_unaligned_access(insn_size_t instruction, struct pt_regs *regs,
-                            struct mem_access *ma, int expected)
+                            struct mem_access *ma, int expected,
+                            unsigned long address)
 {
         u_int rm;
         int ret, index;
@@ -383,9 +385,18 @@ int handle_unaligned_access(insn_size_t instruction, struct pt_regs *regs,
         index = (instruction>>8)&15;    /* 0x0F00 */
         rm = regs->regs[index];
 
-        /* shout about fixups */
-        if (!expected)
+        /*
+         * Log the unexpected fixups, and then pass them on to perf.
+         *
+         * We intentionally don't report the expected cases to perf as
+         * otherwise the trapped I/O case will skew the results too much
+         * to be useful.
+         */
+        if (!expected) {
                 unaligned_fixups_notify(current, instruction, regs);
+                perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, 0,
+                              regs, address);
+        }
 
         ret = -EFAULT;
         switch (instruction&0xF000) {
@@ -574,7 +585,8 @@ fixup:
 
                 set_fs(USER_DS);
                 tmp = handle_unaligned_access(instruction, regs,
-                                              &user_mem_access, 0);
+                                              &user_mem_access, 0,
+                                              address);
                 set_fs(oldfs);
 
                 if (tmp == 0)
@@ -607,8 +619,8 @@ uspace_segv:
 
                 unaligned_fixups_notify(current, instruction, regs);
 
-                handle_unaligned_access(instruction, regs,
-                                        &user_mem_access, 0);
+                handle_unaligned_access(instruction, regs, &user_mem_access,
+                                        0, address);
                 set_fs(oldfs);
         }
 }
@@ -802,6 +814,9 @@ void __cpuinit per_cpu_trap_init(void)
                      : /* no output */
                      : "r" (&vbr_base)
                      : "memory");
+
+        /* disable exception blocking now when the vbr has been setup */
+        clear_bl_bit();
 }
 
 void *set_exception_table_vec(unsigned int vec, void *handler)