From: Di Zhu zhudi21@huawei.com
[ Upstream commit 275b1e88cabb34dbcbe99756b67e9939d34a99b6 ]
pktgen create threads for all online cpus and bond these threads to relevant cpu repecivtily. when this thread firstly be woken up, it will compare cpu currently running with the cpu specified at the time of creation and if the two cpus are not equal, BUG_ON() will take effect causing panic on the system. Notice that these threads could be migrated to other cpus before start running because of the cpu hotplug after these threads have created. so the BUG_ON() used here seems unreasonable and we can replace it with WARN_ON() to just printf a warning other than panic the system.
Signed-off-by: Di Zhu zhudi21@huawei.com Link: https://lore.kernel.org/r/20210125124229.19334-1-zhudi21@huawei.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/core/pktgen.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/core/pktgen.c b/net/core/pktgen.c index 092fa3d75b32..3714cd9e3111 100644 --- a/net/core/pktgen.c +++ b/net/core/pktgen.c @@ -3471,7 +3471,7 @@ static int pktgen_thread_worker(void *arg) struct pktgen_dev *pkt_dev = NULL; int cpu = t->cpu;
- BUG_ON(smp_processor_id() != cpu); + WARN_ON(smp_processor_id() != cpu);
init_waitqueue_head(&t->queue); complete(&t->start_done);