linux-kernel - [PATCH 5.10 053/238] bpftool: Silence build warning about calloc()

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Message-ID: <20240324234027.1354210-54-sashal@kernel.org>
Date: Sun, 24 Mar 2024 19:37:21 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Tiezhu Yang <yangtiezhu@...ngson.cn>,
	Daniel Borkmann <daniel@...earbox.net>,
	Quentin Monnet <quentin@...valent.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 053/238] bpftool: Silence build warning about calloc()

From: Tiezhu Yang <yangtiezhu@...ngson.cn>

[ Upstream commit f5f30386c78105cba520e443a6a9ee945ec1d066 ]

There exists the following warning when building bpftool:

  CC      prog.o
prog.c: In function ‘profile_open_perf_events’:
prog.c:2301:24: warning: ‘calloc’ sizes specified with ‘sizeof’ in the earlier argument and not in the later argument [-Wcalloc-transposed-args]
 2301 |                 sizeof(int), obj->rodata->num_cpu * obj->rodata->num_metric);
      |                        ^~~
prog.c:2301:24: note: earlier argument should specify number of elements, later size of each element

Tested with the latest upstream GCC which contains a new warning option
-Wcalloc-transposed-args. The first argument to calloc is documented to
be number of elements in array, while the second argument is size of each
element, just switch the first and second arguments of calloc() to silence
the build warning, compile tested only.

Fixes: 47c09d6a9f67 ("bpftool: Introduce "prog profile" command")
Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
Reviewed-by: Quentin Monnet <quentin@...valent.com>
Link: https://lore.kernel.org/bpf/20240116061920.31172-1-yangtiezhu@loongson.cn
Signed-off-by: Alexei Starovoitov <ast@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/bpf/bpftool/prog.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
index d2bcce627b320..d07996e7952f3 100644
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -1946,7 +1946,7 @@ static int profile_open_perf_events(struct profiler_bpf *obj)
 	int map_fd;
 
 	profile_perf_events = calloc(
-		sizeof(int), obj->rodata->num_cpu * obj->rodata->num_metric);
+		obj->rodata->num_cpu * obj->rodata->num_metric, sizeof(int));
 	if (!profile_perf_events) {
 		p_err("failed to allocate memory for perf_event array: %s",
 		      strerror(errno));
-- 
2.43.0