Thread (11 messages) 11 messages, 1 author, 2d ago
WARM2d

[PATCH 09/10] tracing/kprobe: Remove redundant memset in kprobe_perf_func()

From: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Date: 2026-07-20 10:45:00
Also in: lkml
Subsystem: the rest, tracing · Maintainers: Linus Torvalds, Steven Rostedt, Masami Hiramatsu

From: Masami Hiramatsu (Google) <mhiramat@kernel.org>

kprobe_perf_func() calls memset(&entry[1], 0, dsize) prior to calling
store_trace_args(). store_trace_args() populates the entry buffer and
handles dynamic data fields.

Remove this redundant memset call to align with kretprobe_perf_func() and
other probe perf functions.

Assisted-by: Antigravity:gemini-3.5-flash
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
---
 kernel/trace/trace_kprobe.c |    1 -
 1 file changed, 1 deletion(-)
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index cc24e992732c..c25f902aa1a6 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1721,7 +1721,6 @@ kprobe_perf_func(struct trace_kprobe *tk, struct pt_regs *regs)
 		return 0;
 
 	entry->ip = (unsigned long)tk->rp.kp.addr;
-	memset(&entry[1], 0, dsize);
 	store_trace_args(&entry[1], &tk->tp, regs, NULL, sizeof(*entry), dsize);
 	perf_trace_buf_submit(entry, size, rctx, call->event.type, 1, regs,
 			      head, NULL);
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