Commit 216158f063fe for kernel

commit 216158f063fe24fb003bd7da0cd92cd6e2c4d48b
Author: Ankit Khushwaha <ankitkhushwaha.linux@gmail.com>
Date:   Thu Nov 6 15:25:32 2025 +0530

    selftests/user_events: fix type cast for write_index packed member in perf_test

    Accessing 'reg.write_index' directly triggers a -Waddress-of-packed-member
    warning due to potential unaligned pointer access:

    perf_test.c:239:38: warning: taking address of packed member 'write_index'
    of class or structure 'user_reg' may result in an unaligned pointer value
    [-Waddress-of-packed-member]
      239 |         ASSERT_NE(-1, write(self->data_fd, &reg.write_index,
          |                                             ^~~~~~~~~~~~~~~

    Since write(2) works with any alignment. Casting '&reg.write_index'
    explicitly to 'void *' to suppress this warning.

    Link: https://lkml.kernel.org/r/20251106095532.15185-1-ankitkhushwaha.linux@gmail.com
    Fixes: 42187bdc3ca4 ("selftests/user_events: Add perf self-test for empty arguments events")
    Signed-off-by: Ankit Khushwaha <ankitkhushwaha.linux@gmail.com>
    Cc: Beau Belgrave <beaub@linux.microsoft.com>
    Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    Cc: sunliming <sunliming@kylinos.cn>
    Cc: Wei Yang <richard.weiyang@gmail.com>
    Cc: Shuah Khan <shuah@kernel.org>
    Cc: <stable@vger.kernel.org>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/tools/testing/selftests/user_events/perf_test.c b/tools/testing/selftests/user_events/perf_test.c
index 5288e768b207..68625362add2 100644
--- a/tools/testing/selftests/user_events/perf_test.c
+++ b/tools/testing/selftests/user_events/perf_test.c
@@ -236,7 +236,7 @@ TEST_F(user, perf_empty_events) {
 	ASSERT_EQ(1 << reg.enable_bit, self->check);

 	/* Ensure write shows up at correct offset */
-	ASSERT_NE(-1, write(self->data_fd, &reg.write_index,
+	ASSERT_NE(-1, write(self->data_fd, (void *)&reg.write_index,
 					sizeof(reg.write_index)));
 	val = (void *)(((char *)perf_page) + perf_page->data_offset);
 	ASSERT_EQ(PERF_RECORD_SAMPLE, *val);