Re: [PATCH v4 9/9] Documentation: tracing: Add a note about argument and retval access
From: Florent Revest <hidden>
Date: 2023-08-25 16:13:42
Also in:
bpf, lkml
On Wed, Aug 23, 2023 at 5:17 PM Masami Hiramatsu (Google) [off-list ref] wrote:
quoted hunk ↗ jump to hunk
diff --git a/Documentation/trace/fprobetrace.rst b/Documentation/trace/fprobetrace.rst index 8e9bebcf0a2e..e35e6b18df40 100644 --- a/Documentation/trace/fprobetrace.rst +++ b/Documentation/trace/fprobetrace.rst@@ -59,8 +59,12 @@ Synopsis of fprobe-events and bitfield are supported. (\*1) This is available only when BTF is enabled. - (\*2) only for the probe on function entry (offs == 0). - (\*3) only for return probe. + (\*2) only for the probe on function entry (offs == 0). Note, this argument access + is best effort, because depending on the argument type, it may be passed on + the stack. But this only support the arguments via registers.
supports* Otherwise: Acked-by: Florent Revest <redacted>