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.

Fixes: 97d06802d10a ("sysfs: constify bin_attribute argument of 
bin_attribute::read/write()")
Reported-by: Venkat Rao Bagalkote <[email protected]>
Closes: 
https://lore.kernel.org/all/[email protected]/
Tested-by: Venkat Rao Bagalkote <[email protected]>
Signed-off-by: Saket Kumar Bhaskar <[email protected]>
---

[RESEND]:
 - Added Fixes and Tested-by tag.
 - Added Greg as receipent for driver-core tree.

Original patch: 
https://lore.kernel.org/all/[email protected]/

 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)
 {
        struct bpf_testmod_test_read_ctx ctx = {
@@ -465,7 +465,7 @@ ALLOW_ERROR_INJECTION(bpf_testmod_test_read, ERRNO);
 
 noinline ssize_t
 bpf_testmod_test_write(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)
 {
        struct bpf_testmod_test_write_ctx ctx = {
-- 
2.43.5


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