linux-kernel - [PATCH] tracing: Use vmalloc

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Message-Id: <20250817084725.59477-1-rongqianfeng@vivo.com>
Date: Sun, 17 Aug 2025 16:47:25 +0800
From: Qianfeng Rong <rongqianfeng@...o.com>
To: Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org
Cc: Qianfeng Rong <rongqianfeng@...o.com>
Subject: [PATCH] tracing: Use vmalloc_array() to improve code

Remove array_size() calls and replace vmalloc() with vmalloc_array() in
tracing_map_sort_entries().  vmalloc_array() is optimized better, uses
fewer instructions, and handles overflow more concisely[1].

[1]: https://lore.kernel.org/lkml/abc66ec5-85a4-47e1-9759-2f60ab111971@vivo.com/

Signed-off-by: Qianfeng Rong <rongqianfeng@...o.com>
---
 kernel/trace/tracing_map.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/tracing_map.c b/kernel/trace/tracing_map.c
index 1921ade45be3..7f8da4dab69d 100644
--- a/kernel/trace/tracing_map.c
+++ b/kernel/trace/tracing_map.c
@@ -1076,7 +1076,7 @@ int tracing_map_sort_entries(struct tracing_map *map,
 	struct tracing_map_sort_entry *sort_entry, **entries;
 	int i, n_entries, ret;
 
-	entries = vmalloc(array_size(sizeof(sort_entry), map->max_elts));
+	entries = vmalloc_array(map->max_elts, sizeof(sort_entry));
 	if (!entries)
 		return -ENOMEM;
 
-- 
2.34.1