diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/oprofile/cpu_buffer.c | 18 | ||||
| -rw-r--r-- | drivers/oprofile/cpu_buffer.h | 17 |
2 files changed, 18 insertions, 17 deletions
diff --git a/drivers/oprofile/cpu_buffer.c b/drivers/oprofile/cpu_buffer.c index 7e5e650e409f..d6f5de686363 100644 --- a/drivers/oprofile/cpu_buffer.c +++ b/drivers/oprofile/cpu_buffer.c @@ -148,22 +148,6 @@ 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) -{ - unsigned long new_head = b->head_pos + 1; - - /* - * Ensure anything written to the slot before we increment is - * visible - */ - wmb(); - - if (new_head < b->buffer_size) - b->head_pos = new_head; - else - b->head_pos = 0; -} - static inline void add_sample(struct oprofile_cpu_buffer *cpu_buf, unsigned long pc, unsigned long event) @@ -171,7 +155,7 @@ add_sample(struct oprofile_cpu_buffer *cpu_buf, struct op_sample *entry = cpu_buffer_write_entry(cpu_buf); entry->eip = pc; entry->event = event; - increment_head(cpu_buf); + cpu_buffer_write_commit(cpu_buf); } static inline void diff --git a/drivers/oprofile/cpu_buffer.h b/drivers/oprofile/cpu_buffer.h index 08706991fdd2..e6089768ae66 100644 --- a/drivers/oprofile/cpu_buffer.h +++ b/drivers/oprofile/cpu_buffer.h @@ -59,6 +59,23 @@ struct op_sample *cpu_buffer_write_entry(struct oprofile_cpu_buffer *cpu_buf) } static inline +void cpu_buffer_write_commit(struct oprofile_cpu_buffer *b) +{ + unsigned long new_head = b->head_pos + 1; + + /* + * Ensure anything written to the slot before we increment is + * visible + */ + wmb(); + + if (new_head < b->buffer_size) + b->head_pos = new_head; + else + b->head_pos = 0; +} + +static inline struct op_sample *cpu_buffer_read_entry(struct oprofile_cpu_buffer *cpu_buf) { return &cpu_buf->buffer[cpu_buf->tail_pos]; |