diff options
| author | Rosen Penev <rosenp@gmail.com> | 2026-06-01 23:35:21 +0900 |
|---|---|---|
| committer | Masami Hiramatsu (Google) <mhiramat@kernel.org> | 2026-06-01 23:35:21 +0900 |
| commit | cf24cbb4e5861caacfdb5bface90b80eaa26e649 (patch) | |
| tree | 98c2aac9c34699d9d9622d94dd65a6cfc2a38076 | |
| parent | 4304c8165281fe730b6861d37a30b567d3c57832 (diff) | |
tracing: Use flexible array for entry fetch code
Store probe entry fetch instructions in the probe_entry_arg
allocation instead of allocating a separate instruction array.
This keeps the entry fetch code tied to the entry argument lifetime while
leaving regular probe_arg instruction arrays separately allocated and
freed.
Assisted-by: Codex:GPT-5.5
Link: https://lore.kernel.org/all/20260520215817.16560-1-rosenp@gmail.com/
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
| -rw-r--r-- | kernel/trace/trace_probe.c | 8 | ||||
| -rw-r--r-- | kernel/trace/trace_probe.h | 2 |
2 files changed, 2 insertions, 8 deletions
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c index 44c22d4e7881..695310571b08 100644 --- a/kernel/trace/trace_probe.c +++ b/kernel/trace/trace_probe.c @@ -838,15 +838,10 @@ static int __store_entry_arg(struct trace_probe *tp, int argnum) int i, offset, last_offset = 0; if (!earg) { - earg = kzalloc_obj(*tp->entry_arg); + earg = kzalloc_flex(*earg, code, 2 * tp->nr_args + 1); if (!earg) return -ENOMEM; earg->size = 2 * tp->nr_args + 1; - earg->code = kzalloc_objs(struct fetch_insn, earg->size); - if (!earg->code) { - kfree(earg); - return -ENOMEM; - } /* Fill the code buffer with 'end' to simplify it */ for (i = 0; i < earg->size; i++) earg->code[i].op = FETCH_OP_END; @@ -2049,7 +2044,6 @@ void trace_probe_cleanup(struct trace_probe *tp) traceprobe_free_probe_arg(&tp->args[i]); if (tp->entry_arg) { - kfree(tp->entry_arg->code); kfree(tp->entry_arg); tp->entry_arg = NULL; } diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h index 262d8707a3df..1076f1df347b 100644 --- a/kernel/trace/trace_probe.h +++ b/kernel/trace/trace_probe.h @@ -238,8 +238,8 @@ struct probe_arg { }; struct probe_entry_arg { - struct fetch_insn *code; unsigned int size; /* The entry data size */ + struct fetch_insn code[] __counted_by(size); }; struct trace_uprobe_filter { |