[PATCH] selftests/bpf: Fix procmap_query()'s params mismatch and compilation warning

[PATCH] selftests/bpf: Fix procmap_query()'s params mismatch and compilation warning

[Yuan Chen]

From: Yuan Chen <chenyuan@kylinos.cn>

When the PROCMAP_QUERY is not defined, a compilation error occurs due to the
mismatch of the procmap_query()'s params, procmap_query() only be called in
the file where the function is defined, modify the params so they can match.

We get a warning when build samples/bpf:
    trace_helpers.c:252:5: warning: no previous prototype for ‘procmap_query’ [-Wmissing-prototypes]
      252 | int procmap_query(int fd, const void *addr, __u32 query_flags, size_t *start, size_t *offset, int *flags)
          |     ^~~~~~~~~~~~~
As this function is only used in the file, mark it as 'static'.

Signed-off-by: Yuan Chen <chenyuan@kylinos.cn>
---
 tools/testing/selftests/bpf/trace_helpers.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/bpf/trace_helpers.c b/tools/testing/selftests/bpf/trace_helpers.c
index 1bfd881c0e07..2d742fdac6b9 100644
--- a/tools/testing/selftests/bpf/trace_helpers.c
+++ b/tools/testing/selftests/bpf/trace_helpers.c
@@ -249,7 +249,7 @@ int kallsyms_find(const char *sym, unsigned long long *addr)
 #ifdef PROCMAP_QUERY
 int env_verbosity __weak = 0;
 
-int procmap_query(int fd, const void *addr, __u32 query_flags, size_t *start, size_t *offset, int *flags)
+static int procmap_query(int fd, const void *addr, __u32 query_flags, size_t *start, size_t *offset, int *flags)
 {
 	char path_buf[PATH_MAX], build_id_buf[20];
 	struct procmap_query q;
@@ -293,7 +293,7 @@ int procmap_query(int fd, const void *addr, __u32 query_flags, size_t *start, si
 	return 0;
 }
 #else
-int procmap_query(int fd, const void *addr, size_t *start, size_t *offset, int *flags)
+static int procmap_query(int fd, const void *addr, __u32 query_flags, size_t *start, size_t *offset, int *flags)
 {
 	return -EOPNOTSUPP;
 }
-- 
2.46.0

Re: [PATCH] selftests/bpf: Fix procmap_query()'s params mismatch and compilation warning

[Jiri Olsa]

On Mon, Sep 02, 2024 at 05:32:48PM +0800, Yuan Chen wrote:
> From: Yuan Chen <chenyuan@kylinos.cn>
> 
> When the PROCMAP_QUERY is not defined, a compilation error occurs due to the
> mismatch of the procmap_query()'s params, procmap_query() only be called in
> the file where the function is defined, modify the params so they can match.
> 
> We get a warning when build samples/bpf:
>     trace_helpers.c:252:5: warning: no previous prototype for ‘procmap_query’ [-Wmissing-prototypes]
>       252 | int procmap_query(int fd, const void *addr, __u32 query_flags, size_t *start, size_t *offset, int *flags)
>           |     ^~~~~~~~~~~~~
> As this function is only used in the file, mark it as 'static'.
> 
> Signed-off-by: Yuan Chen <chenyuan@kylinos.cn>

perhaps also 

Fixes: 4e9e07603ecd ("selftests/bpf: make use of PROCMAP_QUERY ioctl if available")

Acked-by: Jiri Olsa <jolsa@kernel.org>

jirka

> ---
>  tools/testing/selftests/bpf/trace_helpers.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/testing/selftests/bpf/trace_helpers.c b/tools/testing/selftests/bpf/trace_helpers.c
> index 1bfd881c0e07..2d742fdac6b9 100644
> --- a/tools/testing/selftests/bpf/trace_helpers.c
> +++ b/tools/testing/selftests/bpf/trace_helpers.c
> @@ -249,7 +249,7 @@ int kallsyms_find(const char *sym, unsigned long long *addr)
>  #ifdef PROCMAP_QUERY
>  int env_verbosity __weak = 0;
>  
> -int procmap_query(int fd, const void *addr, __u32 query_flags, size_t *start, size_t *offset, int *flags)
> +static int procmap_query(int fd, const void *addr, __u32 query_flags, size_t *start, size_t *offset, int *flags)
>  {
>  	char path_buf[PATH_MAX], build_id_buf[20];
>  	struct procmap_query q;
> @@ -293,7 +293,7 @@ int procmap_query(int fd, const void *addr, __u32 query_flags, size_t *start, si
>  	return 0;
>  }
>  #else
> -int procmap_query(int fd, const void *addr, size_t *start, size_t *offset, int *flags)
> +static int procmap_query(int fd, const void *addr, __u32 query_flags, size_t *start, size_t *offset, int *flags)
>  {
>  	return -EOPNOTSUPP;
>  }
> -- 
> 2.46.0
> 
>