tools headers: Update the uapi/linux/perf_event.h copy with the kernel sources

To pick up the changes in:

  c53e14f1ea4a8f8d perf: Extend per event callchain limit to branch stack

Addressing this perf tools build warning:

  Warning: Kernel ABI header differences:
    diff -u tools/include/uapi/linux/perf_event.h include/uapi/linux/perf_event.h

Please see tools/include/uapi/README for further details.

Acked-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Link: https://lore.kernel.org/r/20250410001125.391820-4-namhyung@kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

diff --git a/tools/include/uapi/linux/perf_event.h b/tools/include/uapi/linux/perf_event.h
index 0524d541d4e3d50150da03186467382bc60bdf50..5fc753c23734dfc4bf944b9edda802dca0d5deb9 100644 (file)
--- a/tools/include/uapi/linux/perf_event.h
+++ b/tools/include/uapi/linux/perf_event.h
@@ -385,6 +385,8 @@ enum perf_event_read_format {
  *
  * @sample_max_stack: Max number of frame pointers in a callchain,
  *                   should be < /proc/sys/kernel/perf_event_max_stack
+ *                   Max number of entries of branch stack
+ *                   should be < hardware limit
  */
 struct perf_event_attr {