[PATCH 2/2] ftrace: don't allocate ftrace module map
From: Ye Bin <hidden>
Date: 2025-05-23 08:39:56
Also in:
lkml
Subsystem:
function hooks (ftrace), the rest, tracing · Maintainers:
Steven Rostedt, Masami Hiramatsu, Linus Torvalds
From: Ye Bin <redacted> If the ftrace is disabled, it is meaningless to allocate module map. So add check in ftrace_free_mem(). Signed-off-by: Ye Bin <redacted> --- kernel/trace/ftrace.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index ff5d9d73a4a7..56adf45de92e 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c@@ -7824,6 +7824,11 @@ void ftrace_free_mem(struct module *mod, void *start_ptr, void *end_ptr) mutex_lock(&ftrace_lock); + if (ftrace_disabled || (mod && !mod->num_ftrace_callsites)) { + mutex_unlock(&ftrace_lock); + return; + } + /* * If we are freeing module init memory, then check if * any tracer is active. If so, we need to save a mapping of
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2.34.1