pktgen: fix misuse of BUG_ON() in pktgen_thread_worker()

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>

diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 105978604ffdb3d191571bc50bf8861c8d4b8d1a..3fba429f1f57b04c54389699e25b1eb060a3bd45 100644 (file)
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -3464,7 +3464,7 @@ 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);