diff options
Diffstat (limited to 'drivers/oprofile/cpu_buffer.h')
| -rw-r--r-- | drivers/oprofile/cpu_buffer.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/oprofile/cpu_buffer.h b/drivers/oprofile/cpu_buffer.h index 0870699..e608976 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]; |
