diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/perf_counter.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c index 5ecd9981c03..3f11a2bc6c7 100644 --- a/kernel/perf_counter.c +++ b/kernel/perf_counter.c @@ -2067,8 +2067,8 @@ __weak struct perf_callchain_entry *perf_callchain(struct pt_regs *regs) struct perf_output_handle { struct perf_counter *counter; struct perf_mmap_data *data; - unsigned int offset; - unsigned int head; + unsigned long head; + unsigned long offset; int nmi; int overflow; int locked; @@ -2122,7 +2122,8 @@ static void perf_output_lock(struct perf_output_handle *handle) static void perf_output_unlock(struct perf_output_handle *handle) { struct perf_mmap_data *data = handle->data; - int head, cpu; + unsigned long head; + int cpu; data->done_head = data->head; @@ -2135,7 +2136,7 @@ again: * before we publish the new head, matched by a rmb() in userspace when * reading this position. */ - while ((head = atomic_xchg(&data->done_head, 0))) + while ((head = atomic_long_xchg(&data->done_head, 0))) data->user_page->data_head = head; /* @@ -2148,7 +2149,7 @@ again: /* * Therefore we have to validate we did not indeed do so. */ - if (unlikely(atomic_read(&data->done_head))) { + if (unlikely(atomic_long_read(&data->done_head))) { /* * Since we had it locked, we can lock it again. */ @@ -2195,7 +2196,7 @@ static int perf_output_begin(struct perf_output_handle *handle, do { offset = head = atomic_read(&data->head); head += size; - } while (atomic_cmpxchg(&data->head, offset, head) != offset); + } while (atomic_long_cmpxchg(&data->head, offset, head) != offset); handle->offset = offset; handle->head = head; @@ -2246,7 +2247,7 @@ static void perf_output_copy(struct perf_output_handle *handle, * Check we didn't copy past our reservation window, taking the * possible unsigned int wrap into account. */ - WARN_ON_ONCE(((int)(handle->head - handle->offset)) < 0); + WARN_ON_ONCE(((long)(handle->head - handle->offset)) < 0); } #define perf_output_put(handle, x) \ |