4.19-stable review patch. If anyone has any objections, please let me know.
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From: Tony Ambardar tony.ambardar@gmail.com
[ 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@gmail.com Signed-off-by: Andrii Nakryiko andrii@kernel.org Link: https://lore.kernel.org/bpf/22993dfb11ccf27925a626b32672fd3324cb76c4.1722244... Signed-off-by: Sasha Levin sashal@kernel.org --- 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 781c7de343be0..a9ed4b58c0879 100644 --- a/tools/testing/selftests/bpf/test_lru_map.c +++ b/tools/testing/selftests/bpf/test_lru_map.c @@ -76,7 +76,8 @@ 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;