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Message-ID: <b01130f4-0f9c-9fe4-639b-0dcece4ca09a@iogearbox.net>
Date: Tue, 8 Mar 2022 16:00:22 +0100
From: Daniel Borkmann <daniel@...earbox.net>
To: Guo Zhengkui <guozhengkui@...o.com>, Shuah Khan <shuah@...nel.org>,
Alexei Starovoitov <ast@...nel.org>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...nel.org>,
Dave Marchevsky <davemarchevsky@...com>,
Yucong Sun <sunyucong@...il.com>,
Christy Lee <christylee@...com>,
Delyan Kratunov <delyank@...com>,
Toke Høiland-Jørgensen
<toke@...hat.com>,
"open list:KERNEL SELFTEST FRAMEWORK"
<linux-kselftest@...r.kernel.org>,
"open list:BPF (Safe dynamic programs and tools)"
<netdev@...r.kernel.org>,
"open list:BPF (Safe dynamic programs and tools)"
<bpf@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>
Cc: zhengkui_guo@...look.com
Subject: Re: [PATCH] selftests/bpf: fix array_size.cocci warning
On 3/8/22 3:59 PM, Daniel Borkmann wrote:
> On 3/8/22 10:17 AM, Guo Zhengkui wrote:
>> Fix the array_size.cocci warning in tools/testing/selftests/bpf/
>>
>> Use `ARRAY_SIZE(arr)` instead of forms like `sizeof(arr)/sizeof(arr[0])`.
>>
>> syscall.c and test_rdonly_maps.c don't contain header files which
>> implement ARRAY_SIZE() macro. So I add `#include <linux/kernel.h>`,
>> in which ARRAY_SIZE(arr) not only calculates the size of `arr`, but also
>> checks that `arr` is really an array (using __must_be_array(arr)).
>>
>> Signed-off-by: Guo Zhengkui <guozhengkui@...o.com>
> [...]
>> diff --git a/tools/testing/selftests/bpf/progs/syscall.c b/tools/testing/selftests/bpf/progs/syscall.c
>> index e550f728962d..85c6e7849463 100644
>> --- a/tools/testing/selftests/bpf/progs/syscall.c
>> +++ b/tools/testing/selftests/bpf/progs/syscall.c
>> @@ -6,6 +6,7 @@
>> #include <bpf/bpf_tracing.h>
>> #include <../../../tools/include/linux/filter.h>
>> #include <linux/btf.h>
>> +#include <linux/kernel.h>
>> char _license[] SEC("license") = "GPL";
>> @@ -82,7 +83,7 @@ int bpf_prog(struct args *ctx)
>> static __u64 value = 34;
>> static union bpf_attr prog_load_attr = {
>> .prog_type = BPF_PROG_TYPE_XDP,
>> - .insn_cnt = sizeof(insns) / sizeof(insns[0]),
>> + .insn_cnt = ARRAY_SIZE(insns),
>> };
>> int ret;
>> diff --git a/tools/testing/selftests/bpf/progs/test_rdonly_maps.c b/tools/testing/selftests/bpf/progs/test_rdonly_maps.c
>> index fc8e8a34a3db..ca75aac745a4 100644
>> --- a/tools/testing/selftests/bpf/progs/test_rdonly_maps.c
>> +++ b/tools/testing/selftests/bpf/progs/test_rdonly_maps.c
>> @@ -3,6 +3,7 @@
>> #include <linux/ptrace.h>
>> #include <linux/bpf.h>
>> +#include <linux/kernel.h>
>> #include <bpf/bpf_helpers.h>
>> const struct {
>> @@ -64,7 +65,7 @@ int full_loop(struct pt_regs *ctx)
>> {
>> /* prevent compiler to optimize everything out */
>> unsigned * volatile p = (void *)&rdonly_values.a;
>> - int i = sizeof(rdonly_values.a) / sizeof(rdonly_values.a[0]);
>> + int i = ARRAY_SIZE(rdonly_values.a);
>> unsigned iters = 0, sum = 0;
>
> There's bpf_util.h with ARRAY_SIZE definition which is used in selftests, pls change to
> reuse that one.
Also, CI failed with your patch:
https://github.com/kernel-patches/bpf/runs/5462211251?check_suite_focus=true
In file included from progs/test_rdonly_maps.c:6:
In file included from /usr/include/linux/kernel.h:5:
/usr/include/linux/sysinfo.h:9:2: error: unknown type name '__kernel_long_t'
__kernel_long_t uptime; /* Seconds since boot */
^
/usr/include/linux/sysinfo.h:10:2: error: unknown type name '__kernel_ulong_t'
__kernel_ulong_t loads[3]; /* 1, 5, and 15 minute load averages */
^
/usr/include/linux/sysinfo.h:11:2: error: unknown type name '__kernel_ulong_t'
__kernel_ulong_t totalram; /* Total usable main memory size */
^
/usr/include/linux/sysinfo.h:12:2: error: unknown type name '__kernel_ulong_t'
__kernel_ulong_t freeram; /* Available memory size */
^
/usr/include/linux/sysinfo.h:13:2: error: unknown type name '__kernel_ulong_t'
__kernel_ulong_t sharedram; /* Amount of shared memory */
^
/usr/include/linux/sysinfo.h:14:2: error: unknown type name '__kernel_ulong_t'
__kernel_ulong_t bufferram; /* Memory used by buffers */
^
/usr/include/linux/sysinfo.h:15:2: error: unknown type name '__kernel_ulong_t'
__kernel_ulong_t totalswap; /* Total swap space size */
^
/usr/include/linux/sysinfo.h:16:2: error: unknown type name '__kernel_ulong_t'
__kernel_ulong_t freeswap; /* swap space still available */
^
/usr/include/linux/sysinfo.h:19:2: error: unknown type name '__kernel_ulong_t'
__kernel_ulong_t totalhigh; /* Total high memory size */
^
/usr/include/linux/sysinfo.h:20:2: error: unknown type name '__kernel_ulong_t'
__kernel_ulong_t freehigh; /* Available high memory size */
^
/usr/include/linux/sysinfo.h:22:22: error: use of undeclared identifier '__kernel_ulong_t'
char _f[20-2*sizeof(__kernel_ulong_t)-sizeof(__u32)]; /* Padding: libc5 uses this.. */
^
progs/test_rdonly_maps.c:68:10: error: implicit declaration of function 'ARRAY_SIZE' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
int i = ARRAY_SIZE(rdonly_values.a);
^
12 errors generated.
make: *** [Makefile:488: /tmp/runner/work/bpf/bpf/tools/testing/selftests/bpf/test_rdonly_maps.o] Error 1
make: *** Waiting for unfinished jobs....
Error: Process completed with exit code 2.
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