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

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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>
This commit is contained in:
Zhao Mengmeng 2026-03-03 15:23:17 +08:00 • committed by Tejun Heo
parent 01a867c2e0
commit 75ad518259
1 changed files with 2 additions and 2 deletions
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4
tools/testing/selftests/sched_ext/peek_dsq.bpf.c
View file

@ -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;