Commit 75ad51825933 for kernel

commit 75ad51825933575906394d0d5db04586b02db00a
Author: Zhao Mengmeng <zhaomengmeng@kylinos.cn>
Date:   Tue Mar 3 15:23:17 2026 +0800

    selftests/sched_ext: Fix peek_dsq.bpf.c compile error for clang 17

    When compiling sched_ext selftests using clang 17.0.6, it raised
    compiler crash and build error:

    Error at line 68: Unsupport signed division for DAG: 0x55b2f9a60240:
    i64 = sdiv 0x55b2f9a609b0, Constant:i64<100>, peek_dsq.bpf.c:68:25 @[
    peek_dsq.bpf.c:95:4 @[ peek_dsq.bpf.c:169:8 @[ peek
    _dsq.bpf.c:140:6 ] ] ]Please convert to unsigned div/mod

    After digging, it's not a compiler error, clang supported Signed division
    only when using -mcpu=v4, while we use -mcpu=v3 currently, the better way
    is to use unsigned div, see [1] for details.

    [1] https://github.com/llvm/llvm-project/issues/70433

    Signed-off-by: Zhao Mengmeng <zhaomengmeng@kylinos.cn>
    Reviewed-by: Andrea Righi <arighi@nvidia.com>
    Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/tools/testing/selftests/sched_ext/peek_dsq.bpf.c b/tools/testing/selftests/sched_ext/peek_dsq.bpf.c
index a3faf5bb49d6..784f2f6c1af9 100644
--- a/tools/testing/selftests/sched_ext/peek_dsq.bpf.c
+++ b/tools/testing/selftests/sched_ext/peek_dsq.bpf.c
@@ -58,14 +58,14 @@ static void record_peek_result(long pid)
 {
 	u32 slot_key;
 	long *slot_pid_ptr;
-	int ix;
+	u32 ix;

 	if (pid <= 0)
 		return;

 	/* Find an empty slot or one with the same PID */
 	bpf_for(ix, 0, 10) {
-		slot_key = (pid + ix) % MAX_SAMPLES;
+		slot_key = ((u64)pid + ix) % MAX_SAMPLES;
 		slot_pid_ptr = bpf_map_lookup_elem(&peek_results, &slot_key);
 		if (!slot_pid_ptr)
 			continue;