[PATCH] tracing: Use kstrdup_const() for constant hist field type
From: Yu Peng <hidden>
Date: 2026-05-26 09:51:16
Also in:
lkml
Subsystem:
the rest, tracing · Maintainers:
Linus Torvalds, Steven Rostedt, Masami Hiramatsu
The HIST_FIELD_FL_CONST path duplicates the literal "u64" type with kstrdup(), then releases it through kfree_const(). Use kstrdup_const() instead, avoiding the allocation for a .rodata string while keeping the matching free helper. Signed-off-by: Yu Peng <redacted> --- kernel/trace/trace_events_hist.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index eb2c2bc8bc3d..6ffe9f4720a0 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c@@ -1992,7 +1992,7 @@ static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data, if (flags & HIST_FIELD_FL_CONST) { hist_field->fn_num = HIST_FIELD_FN_CONST; hist_field->size = sizeof(u64); - hist_field->type = kstrdup("u64", GFP_KERNEL); + hist_field->type = kstrdup_const("u64", GFP_KERNEL); if (!hist_field->type) goto free; goto out;
--
2.43.0