diff options
| -rw-r--r-- | include/linux/perf_event.h | 2 | ||||
| -rw-r--r-- | kernel/perf_event.c | 20 |
2 files changed, 4 insertions, 18 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 09cd9c1abfd..fb6c91eac7e 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -803,8 +803,6 @@ struct perf_cpu_context { struct perf_output_handle { struct perf_event *event; struct perf_mmap_data *data; - unsigned long head; - unsigned long offset; unsigned long wakeup; unsigned long size; void *addr; diff --git a/kernel/perf_event.c b/kernel/perf_event.c index 953ce46d7b2..d25c864cadb 100644 --- a/kernel/perf_event.c +++ b/kernel/perf_event.c @@ -2967,20 +2967,11 @@ again: preempt_enable(); } -void perf_output_copy(struct perf_output_handle *handle, +__always_inline void perf_output_copy(struct perf_output_handle *handle, const void *buf, unsigned int len) { - handle->offset += len; - - /* - * Check we didn't copy past our reservation window, taking the - * possible unsigned int wrap into account. - */ - if (WARN_ON_ONCE(((long)(handle->head - handle->offset)) < 0)) - return; - do { - unsigned long size = min(handle->size, len); + unsigned long size = min_t(unsigned long, handle->size, len); memcpy(handle->addr, buf, size); @@ -3055,15 +3046,12 @@ int perf_output_begin(struct perf_output_handle *handle, goto fail; } while (local_cmpxchg(&data->head, offset, head) != offset); - handle->offset = offset; - handle->head = head; - if (head - local_read(&data->wakeup) > data->watermark) local_add(data->watermark, &data->wakeup); - handle->page = handle->offset >> (PAGE_SHIFT + page_order(data)); + handle->page = offset >> (PAGE_SHIFT + page_order(data)); handle->page &= data->nr_pages - 1; - handle->size = handle->offset & ((PAGE_SIZE << page_order(data)) - 1); + handle->size = offset & ((PAGE_SIZE << page_order(data)) - 1); handle->addr = data->data_pages[handle->page]; handle->addr += handle->size; handle->size = (PAGE_SIZE << page_order(data)) - handle->size; |