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Date: Fri, 18 Nov 2022 23:29:07 +0100
From: Daniel Borkmann <daniel@...earbox.net>
To: Liao Chang <liaochang1@...wei.com>, ast@...nel.org,
andrii@...nel.org, martin.lau@...ux.dev, song@...nel.org,
yhs@...com, john.fastabend@...il.com, kpsingh@...nel.org,
sdf@...gle.com, haoluo@...gle.com, jolsa@...nel.org
Cc: bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] samples/bpf: Fix duplicate struct define in test_lru_dist
sample
On 11/18/22 1:47 AM, Liao Chang wrote:
> Build sample/bpf report error as follow:
>
> CC ./samples/bpf/test_lru_dist
> ./samples/bpf/test_lru_dist.c:35:8: error: redefinition of ‘struct list_head’
> 35 | struct list_head {
> | ^~~~~~~~~
> In file included from ./samples/bpf/test_lru_dist.c:6:
> ./tools/include/linux/types.h:84:8: note: originally defined here
> 84 | struct list_head {
>
> Remove the duplicate definition of struct list_head in test_lru_dist.c
>
> Signed-off-by: Liao Chang <liaochang1@...wei.com>
> ---
> samples/bpf/test_lru_dist.c | 4 ----
> 1 file changed, 4 deletions(-)
>
> diff --git a/samples/bpf/test_lru_dist.c b/samples/bpf/test_lru_dist.c
> index 5efb91763d65..2e7341044090 100644
> --- a/samples/bpf/test_lru_dist.c
> +++ b/samples/bpf/test_lru_dist.c
> @@ -32,10 +32,6 @@ static int nr_cpus;
> static unsigned long long *dist_keys;
> static unsigned int dist_key_counts;
>
> -struct list_head {
> - struct list_head *next, *prev;
> -};
> -
This will actually break it, see CI:
https://github.com/kernel-patches/bpf/actions/runs/3500019006/jobs/5862316961
[...]
CLANG-bpf /tmp/work/bpf/bpf/samples/bpf/lathist_kern.o
CLANG-bpf /tmp/work/bpf/bpf/samples/bpf/offwaketime_kern.o
CLANG-bpf /tmp/work/bpf/bpf/samples/bpf/spintest_kern.o
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:35:42: warning: ‘struct list_head’ declared inside parameter list will not be visible outside of this definition or declaration
35 | static inline void INIT_LIST_HEAD(struct list_head *list)
| ^~~~~~~~~
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c: In function ‘INIT_LIST_HEAD’:
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:37:6: error: dereferencing pointer to incomplete type ‘struct list_head’
37 | list->next = list;
| ^~
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c: At top level:
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:41:43: warning: ‘struct list_head’ declared inside parameter list will not be visible outside of this definition or declaration
41 | static inline int list_empty(const struct list_head *head)
| ^~~~~~~~~
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c: In function ‘list_empty’:
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:43:13: error: dereferencing pointer to incomplete type ‘const struct list_head’
43 | return head->next == head;
| ^~
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c: At top level:
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:46:38: warning: ‘struct list_head’ declared inside parameter list will not be visible outside of this definition or declaration
46 | static inline void __list_add(struct list_head *new,
| ^~~~~~~~~
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c: In function ‘__list_add’:
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:50:6: error: dereferencing pointer to incomplete type ‘struct list_head’
50 | next->prev = new;
| ^~
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c: At top level:
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:56:36: warning: ‘struct list_head’ declared inside parameter list will not be visible outside of this definition or declaration
56 | static inline void list_add(struct list_head *new, struct list_head *head)
| ^~~~~~~~~
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c: In function ‘list_add’:
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:58:28: error: dereferencing pointer to incomplete type ‘struct list_head’
58 | __list_add(new, head, head->next);
CLANG-bpf /tmp/work/bpf/bpf/samples/bpf/map_perf_test_kern.o
| ^~
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:58:13: warning: passing argument 1 of ‘__list_add’ from incompatible pointer type [-Wincompatible-pointer-types]
58 | __list_add(new, head, head->next);
| ^~~
| |
| struct list_head *
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:46:49: note: expected ‘struct list_head *’ but argument is of type ‘struct list_head *’
46 | static inline void __list_add(struct list_head *new,
| ~~~~~~~~~~~~~~~~~~^~~
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:58:18: warning: passing argument 2 of ‘__list_add’ from incompatible pointer type [-Wincompatible-pointer-types]
58 | __list_add(new, head, head->next);
| ^~~~
| |
| struct list_head *
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:47:28: note: expected ‘struct list_head *’ but argument is of type ‘struct list_head *’
47 | struct list_head *prev,
| ~~~~~~~~~~~~~~~~~~^~~~
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c: At top level:
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:61:38: warning: ‘struct list_head’ declared inside parameter list will not be visible outside of this definition or declaration
61 | static inline void __list_del(struct list_head *prev, struct list_head *next)
| ^~~~~~~~~
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c: In function ‘__list_del’:
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:63:6: error: dereferencing pointer to incomplete type ‘struct list_head’
63 | next->prev = prev;
| ^~
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c: At top level:
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:67:44: warning: ‘struct list_head’ declared inside parameter list will not be visible outside of this definition or declaration
67 | static inline void __list_del_entry(struct list_head *entry)
| ^~~~~~~~~
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c: In function ‘__list_del_entry’:
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:69:18: error: dereferencing pointer to incomplete type ‘struct list_head’
69 | __list_del(entry->prev, entry->next);
| ^~
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c: At top level:
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:72:37: warning: ‘struct list_head’ declared inside parameter list will not be visible outside of this definition or declaration
72 | static inline void list_move(struct list_head *list, struct list_head *head)
| ^~~~~~~~~
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c: In function ‘list_move’:
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:74:19: warning: passing argument 1 of ‘__list_del_entry’ from incompatible pointer type [-Wincompatible-pointer-types]
74 | __list_del_entry(list);
| ^~~~
| |
| struct list_head *
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:67:55: note: expected ‘struct list_head *’ but argument is of type ‘struct list_head *’
67 | static inline void __list_del_entry(struct list_head *entry)
| ~~~~~~~~~~~~~~~~~~^~~~~
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:75:11: warning: passing argument 1 of ‘list_add’ from incompatible pointer type [-Wincompatible-pointer-types]
75 | list_add(list, head);
| ^~~~
| |
| struct list_head *
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:56:47: note: expected ‘struct list_head *’ but argument is of type ‘struct list_head *’
56 | static inline void list_add(struct list_head *new, struct list_head *head)
| ~~~~~~~~~~~~~~~~~~^~~
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:75:17: warning: passing argument 2 of ‘list_add’ from incompatible pointer type [-Wincompatible-pointer-types]
75 | list_add(list, head);
| ^~~~
| |
| struct list_head *
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:56:70: note: expected ‘struct list_head *’ but argument is of type ‘struct list_head *’
56 | static inline void list_add(struct list_head *new, struct list_head *head)
| ~~~~~~~~~~~~~~~~~~^~~~
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c: At top level:
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:85:19: error: field ‘list’ has incomplete type
85 | struct list_head list;
| ^~~~
/tmp/work/bpf/bpf/samples/bpf/test_lru_dist.c:90:19: error: field ‘list’ has incomplete type
90 | struct list_head list;
| ^~~~
CLANG-bpf /tmp/work/bpf/bpf/samples/bpf/test_overhead_tp_kern.o
make[3]: *** [/tmp/work/bpf/bpf/samples/bpf/Makefile.target:58: /tmp/work/bpf/bpf/samples/bpf/test_lru_dist] Error 1
make[3]: *** Waiting for unfinished jobs....
LD /tmp/work/bpf/bpf/samples/bpf/bpftool/bootstrap/libbpf/staticobjs/libbpf-in.o
LINK /tmp/work/bpf/bpf/samples/bpf/bpftool/bootstrap/libbpf/libbpf.a
CC /tmp/work/bpf/bpf/samples/bpf/bpftool/bootstrap/main.o
CC /tmp/work/bpf/bpf/samples/bpf/bpftool/bootstrap/common.o
CC /tmp/work/bpf/bpf/samples/bpf/bpftool/bootstrap/json_writer.o
CC /tmp/work/bpf/bpf/samples/bpf/bpftool/bootstrap/gen.o
CC /tmp/work/bpf/bpf/samples/bpf/bpftool/bootstrap/btf.o
CC /tmp/work/bpf/bpf/samples/bpf/bpftool/bootstrap/xlated_dumper.o
CC /tmp/work/bpf/bpf/samples/bpf/bpftool/bootstrap/btf_dumper.o
CC /tmp/work/bpf/bpf/samples/bpf/bpftool/bootstrap/disasm.o
LINK /tmp/work/bpf/bpf/samples/bpf/bpftool/bootstrap/bpftool
make[2]: *** [/tmp/work/bpf/bpf/Makefile:1992: /tmp/work/bpf/bpf/samples/bpf] Error 2
make[2]: Leaving directory '/tmp/work/bpf/bpf/kbuild-output'
make[1]: *** [Makefile:231: __sub-make] Error 2
make[1]: Leaving directory '/tmp/work/bpf/bpf'
make: *** [Makefile:269: all] Error 2
make: Leaving directory '/tmp/work/bpf/bpf/samples/bpf'
Error: Process completed with exit code 2.
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