6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Tony Ambardar <tony.ambardar@xxxxxxxxx>
[ Upstream commit cacf2a5a78cd1f5f616eae043ebc6f024104b721 ]
Although the post-increment in macro 'CPU_SET(next++, &cpuset)' seems safe,
the sequencing can raise compile errors, so move the increment outside the
macro. This avoids an error seen using gcc 12.3.0 for mips64el/musl-libc:
In file included from test_lru_map.c:11:
test_lru_map.c: In function 'sched_next_online':
test_lru_map.c:129:29: error: operation on 'next' may be undefined [-Werror=sequence-point]
129 | CPU_SET(next++, &cpuset);
| ^
cc1: all warnings being treated as errors
Fixes: 3fbfadce6012 ("bpf: Fix test_lru_sanity5() in test_lru_map.c")
Signed-off-by: Tony Ambardar <tony.ambardar@xxxxxxxxx>
Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
Link: https://lore.kernel.org/bpf/22993dfb11ccf27925a626b32672fd3324cb76c4.1722244708.git.tony.ambardar@xxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
tools/testing/selftests/bpf/test_lru_map.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/bpf/test_lru_map.c b/tools/testing/selftests/bpf/test_lru_map.c
index 4d0650cfb5cd8..fda7589c50236 100644
--- a/tools/testing/selftests/bpf/test_lru_map.c
+++ b/tools/testing/selftests/bpf/test_lru_map.c
@@ -126,7 +126,8 @@ static int sched_next_online(int pid, int *next_to_try)
while (next < nr_cpus) {
CPU_ZERO(&cpuset);
- CPU_SET(next++, &cpuset);
+ CPU_SET(next, &cpuset);
+ next++;
if (!sched_setaffinity(pid, sizeof(cpuset), &cpuset)) {
ret = 0;
break;
--
2.43.0
