Sanity checks cost instructions.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <
20100521090710.
852926930@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
struct perf_output_handle {
struct perf_event *event;
struct perf_mmap_data *data;
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;
unsigned long wakeup;
unsigned long size;
void *addr;
-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)
{
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;
-
- unsigned long size = min(handle->size, len);
+ unsigned long size = min_t(unsigned long, handle->size, len);
memcpy(handle->addr, buf, size);
memcpy(handle->addr, buf, size);
goto fail;
} while (local_cmpxchg(&data->head, offset, head) != offset);
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);
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->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;
handle->addr = data->data_pages[handle->page];
handle->addr += handle->size;
handle->size = (PAGE_SIZE << page_order(data)) - handle->size;