1 files changed, 39 insertions, 52 deletions

diff --git a/drivers/oprofile/cpu_buffer.c b/drivers/oprofile/cpu_buffer.c
index 7ba39fe20a8a..01d38e78cde1 100644
--- a/drivers/oprofile/cpu_buffer.c
+++ b/drivers/oprofile/cpu_buffer.c
@@ -22,7 +22,7 @@
 #include <linux/oprofile.h>
 #include <linux/vmalloc.h>
 #include <linux/errno.h>
- 
+
 #include "event_buffer.h"
 #include "cpu_buffer.h"
 #include "buffer_sync.h"
@@ -39,7 +39,7 @@ void free_cpu_buffers(void)
 {
         int i;
 
-        for_each_online_cpu(i) {
+        for_each_possible_cpu(i) {
                 vfree(per_cpu(cpu_buffer, i).buffer);
                 per_cpu(cpu_buffer, i).buffer = NULL;
         }
@@ -61,17 +61,17 @@ void oprofile_cpu_buffer_inc_smpl_lost(void)
 int alloc_cpu_buffers(void)
 {
         int i;
- 
+
         unsigned long buffer_size = fs_cpu_buffer_size;
- 
-        for_each_online_cpu(i) {
+
+        for_each_possible_cpu(i) {
                 struct oprofile_cpu_buffer *b = &per_cpu(cpu_buffer, i);
- 
+
                 b->buffer = vmalloc_node(sizeof(struct op_sample) * buffer_size,
                         cpu_to_node(i));
                 if (!b->buffer)
                         goto fail;
- 
+
                 b->last_task = NULL;
                 b->last_is_kernel = -1;
                 b->tracing = 0;
@@ -125,7 +125,7 @@ void end_cpu_work(void)
 }
 
 /* Resets the cpu buffer to a sane state. */
-void cpu_buffer_reset(struct oprofile_cpu_buffer * cpu_buf)
+void cpu_buffer_reset(struct oprofile_cpu_buffer *cpu_buf)
 {
         /* reset these to invalid values; the next sample
          * collected will populate the buffer with proper
@@ -136,7 +136,7 @@ void cpu_buffer_reset(struct oprofile_cpu_buffer * cpu_buf)
 }
 
 /* compute number of available slots in cpu_buffer queue */
-static unsigned long nr_available_slots(struct oprofile_cpu_buffer const * b)
+static unsigned long nr_available_slots(struct oprofile_cpu_buffer const *b)
 {
         unsigned long head = b->head_pos;
         unsigned long tail = b->tail_pos;
@@ -147,7 +147,7 @@ static unsigned long nr_available_slots(struct oprofile_cpu_buffer const * b)
         return tail + (b->buffer_size - head) - 1;
 }
 
-static void increment_head(struct oprofile_cpu_buffer * b)
+static void increment_head(struct oprofile_cpu_buffer *b)
 {
         unsigned long new_head = b->head_pos + 1;
 
@@ -162,17 +162,17 @@ static void increment_head(struct oprofile_cpu_buffer * b)
 }
 
 static inline void
-add_sample(struct oprofile_cpu_buffer * cpu_buf,
-           unsigned long pc, unsigned long event)
+add_sample(struct oprofile_cpu_buffer *cpu_buf,
+           unsigned long pc, unsigned long event)
 {
-        struct op_sample * entry = &cpu_buf->buffer[cpu_buf->head_pos];
+        struct op_sample *entry = &cpu_buf->buffer[cpu_buf->head_pos];
         entry->eip = pc;
         entry->event = event;
         increment_head(cpu_buf);
 }
 
 static inline void
-add_code(struct oprofile_cpu_buffer * buffer, unsigned long value)
+add_code(struct oprofile_cpu_buffer *buffer, unsigned long value)
 {
         add_sample(buffer, ESCAPE_CODE, value);
 }
@@ -186,10 +186,10 @@ add_code(struct oprofile_cpu_buffer * buffer, unsigned long value)
  * pc. We tag this in the buffer by generating kernel enter/exit
  * events whenever is_kernel changes
  */
-static int log_sample(struct oprofile_cpu_buffer * cpu_buf, unsigned long pc,
+static int log_sample(struct oprofile_cpu_buffer *cpu_buf, unsigned long pc,
                       int is_kernel, unsigned long event)
 {
-        struct task_struct * task;
+        struct task_struct *task;
 
         cpu_buf->sample_received++;
 
@@ -218,7 +218,7 @@ static int log_sample(struct oprofile_cpu_buffer * cpu_buf, unsigned long pc,
                 cpu_buf->last_task = task;
                 add_code(cpu_buf, (unsigned long)task);
         }
- 
+
         add_sample(cpu_buf, pc, event);
         return 1;
 }
@@ -235,7 +235,7 @@ static int oprofile_begin_trace(struct oprofile_cpu_buffer *cpu_buf)
         return 1;
 }
 
-static void oprofile_end_trace(struct oprofile_cpu_buffer * cpu_buf)
+static void oprofile_end_trace(struct oprofile_cpu_buffer *cpu_buf)
 {
         cpu_buf->tracing = 0;
 }
@@ -270,21 +270,23 @@ void oprofile_add_sample(struct pt_regs * const regs, unsigned long event)
 
 #ifdef CONFIG_OPROFILE_IBS
 
-#define MAX_IBS_SAMPLE_SIZE     14
-static int log_ibs_sample(struct oprofile_cpu_buffer *cpu_buf,
-        unsigned long pc, int is_kernel, unsigned  int *ibs, int ibs_code)
+#define MAX_IBS_SAMPLE_SIZE 14
+
+void oprofile_add_ibs_sample(struct pt_regs *const regs,
+                             unsigned int *const ibs_sample, int ibs_code)
 {
+        int is_kernel = !user_mode(regs);
+        struct oprofile_cpu_buffer *cpu_buf = &__get_cpu_var(cpu_buffer);
         struct task_struct *task;
 
         cpu_buf->sample_received++;
 
         if (nr_available_slots(cpu_buf) < MAX_IBS_SAMPLE_SIZE) {
+                /* we can't backtrace since we lost the source of this event */
                 cpu_buf->sample_lost_overflow++;
-                return 0;
+                return;
         }
 
-        is_kernel = !!is_kernel;
-
         /* notice a switch from user->kernel or vice versa */
         if (cpu_buf->last_is_kernel != is_kernel) {
                 cpu_buf->last_is_kernel = is_kernel;
@@ -294,7 +296,6 @@ static int log_ibs_sample(struct oprofile_cpu_buffer *cpu_buf,
         /* notice a task switch */
         if (!is_kernel) {
                 task = current;
-
                 if (cpu_buf->last_task != task) {
                         cpu_buf->last_task = task;
                         add_code(cpu_buf, (unsigned long)task);
@@ -302,36 +303,17 @@ static int log_ibs_sample(struct oprofile_cpu_buffer *cpu_buf,
         }
 
         add_code(cpu_buf, ibs_code);
-        add_sample(cpu_buf, ibs[0], ibs[1]);
-        add_sample(cpu_buf, ibs[2], ibs[3]);
-        add_sample(cpu_buf, ibs[4], ibs[5]);
+        add_sample(cpu_buf, ibs_sample[0], ibs_sample[1]);
+        add_sample(cpu_buf, ibs_sample[2], ibs_sample[3]);
+        add_sample(cpu_buf, ibs_sample[4], ibs_sample[5]);
 
         if (ibs_code == IBS_OP_BEGIN) {
-        add_sample(cpu_buf, ibs[6], ibs[7]);
-        add_sample(cpu_buf, ibs[8], ibs[9]);
-        add_sample(cpu_buf, ibs[10], ibs[11]);
-        }
-
-        return 1;
-}
-
-void oprofile_add_ibs_sample(struct pt_regs *const regs,
-                                unsigned int * const ibs_sample, u8 code)
-{
-        int is_kernel = !user_mode(regs);
-        unsigned long pc = profile_pc(regs);
-
-        struct oprofile_cpu_buffer *cpu_buf =
-                         &per_cpu(cpu_buffer, smp_processor_id());
-
-        if (!backtrace_depth) {
-                log_ibs_sample(cpu_buf, pc, is_kernel, ibs_sample, code);
-                return;
+                add_sample(cpu_buf, ibs_sample[6], ibs_sample[7]);
+                add_sample(cpu_buf, ibs_sample[8], ibs_sample[9]);
+                add_sample(cpu_buf, ibs_sample[10], ibs_sample[11]);
         }
 
-        /* if log_sample() fails we can't backtrace since we lost the source
-        * of this event */
-        if (log_ibs_sample(cpu_buf, pc, is_kernel, ibs_sample, code))
+        if (backtrace_depth)
                 oprofile_ops.backtrace(regs, backtrace_depth);
 }
 
@@ -376,11 +358,16 @@ void oprofile_add_trace(unsigned long pc)
  */
 static void wq_sync_buffer(struct work_struct *work)
 {
-        struct oprofile_cpu_buffer * b =
+        struct oprofile_cpu_buffer *b =
                 container_of(work, struct oprofile_cpu_buffer, work.work);
         if (b->cpu != smp_processor_id()) {
                 printk(KERN_DEBUG "WQ on CPU%d, prefer CPU%d\n",
                        smp_processor_id(), b->cpu);
+
+                if (!cpu_online(b->cpu)) {
+                        cancel_delayed_work(&b->work);
+                        return;
+                }
         }
         sync_buffer(b->cpu);