[PATCH] selftests/bpf: Fix bpf selftest build error

[Alexei Starovoitov]

On Fri, May 9, 2025 at 5:24 AM Saket Kumar Bhaskar <skb99 at linux.ibm.com> wrote:
>
> On linux-next, build for bpf selftest displays an error due to
> mismatch in the expected function signature of bpf_testmod_test_read
> and bpf_testmod_test_write.
>
> Commit 97d06802d10a ("sysfs: constify bin_attribute argument of bin_attribute::read/write()")
> changed the required type for struct bin_attribute to const struct bin_attribute.
>
> To resolve the error, update corresponding signature for the callback.
>
> Reported-by: Venkat Rao Bagalkote <venkat88 at linux.ibm.com>
> Closes: https://lore.kernel.org/all/e915da49-2b9a-4c4c-a34f-877f378129f6@linux.ibm.com/
> Signed-off-by: Saket Kumar Bhaskar <skb99 at linux.ibm.com>
> ---
>  tools/testing/selftests/bpf/test_kmods/bpf_testmod.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/test_kmods/bpf_testmod.c b/tools/testing/selftests/bpf/test_kmods/bpf_testmod.c
> index 2e54b95ad898..194c442580ee 100644
> --- a/tools/testing/selftests/bpf/test_kmods/bpf_testmod.c
> +++ b/tools/testing/selftests/bpf/test_kmods/bpf_testmod.c
> @@ -385,7 +385,7 @@ int bpf_testmod_fentry_ok;
>
>  noinline ssize_t
>  bpf_testmod_test_read(struct file *file, struct kobject *kobj,
> -                     struct bin_attribute *bin_attr,
> +                     const struct bin_attribute *bin_attr,
>                       char *buf, loff_t off, size_t len)

You didn't even compile it :(

Instead of fixing the build, it breaks the build.

pw-bot: cr