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Subject[sparc64] ftrace: kernel startup-tests unaligned access
Hello!

Enabled ftrace startup tests on a sparc64 test VM/LDOM:

$ diff -u <(gzip -dc ~/dmesg/config-5.10.0.gz) <(gzip -dc /proc/config.gz)
--- /dev/fd/63 2020-12-14 16:19:38.239372599 +0300
+++ /dev/fd/62 2020-12-14 16:19:38.235372433 +0300
@@ -2842,7 +2842,10 @@
# CONFIG_TRACEPOINT_BENCHMARK is not set
# CONFIG_RING_BUFFER_BENCHMARK is not set
# CONFIG_TRACE_EVAL_MAP_FILE is not set
-# CONFIG_FTRACE_STARTUP_TEST is not set
+CONFIG_FTRACE_SELFTEST=y
+CONFIG_FTRACE_STARTUP_TEST=y
+CONFIG_EVENT_TRACE_STARTUP_TEST=y
+# CONFIG_EVENT_TRACE_TEST_SYSCALLS is not set
# CONFIG_RING_BUFFER_STARTUP_TEST is not set
# CONFIG_PREEMPTIRQ_DELAY_TEST is not set
# CONFIG_KPROBE_EVENT_GEN_TEST is not set

Got the following results with kernel boot logs:

Dec 14 13:48:15 kernel: clocksource: jiffies: mask: 0xffffffff
max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns
Dec 14 13:48:15 kernel: futex hash table entries: 65536 (order: 9,
4194304 bytes, linear)
Dec 14 13:48:15 kernel: Running postponed tracer tests:
Dec 14 13:48:15 kernel: Testing tracer function:
Dec 14 13:48:15 kernel: Kernel unaligned access at TPC[552a20]
trace_function+0x40/0x140
Dec 14 13:48:15 kernel: Kernel unaligned access at TPC[552a24]
trace_function+0x44/0x140
Dec 14 13:48:15 kernel: Kernel unaligned access at TPC[552a20]
trace_function+0x40/0x140
Dec 14 13:48:15 kernel: Kernel unaligned access at TPC[552a24]
trace_function+0x44/0x140
Dec 14 13:48:15 kernel: Kernel unaligned access at TPC[552a20]
trace_function+0x40/0x140
Dec 14 13:48:15 kernel: PASSED
Dec 14 13:48:15 kernel: Testing dynamic ftrace: PASSED
...
Dec 14 13:48:15 kernel: Testing event workqueue_execute_end:
Dec 14 13:48:15 kernel: log_unaligned: 194175 callbacks suppressed
Dec 14 13:48:15 kernel: Kernel unaligned access at TPC[47faa4]
trace_event_raw_event_workqueue_execute_end+0x44/0xa0
Dec 14 13:48:15 kernel: Kernel unaligned access at TPC[47fab0]
trace_event_raw_event_workqueue_execute_end+0x50/0xa0
Dec 14 13:48:15 kernel: Kernel unaligned access at TPC[47faa4]
trace_event_raw_event_workqueue_execute_end+0x44/0xa0
Dec 14 13:48:15 kernel: Kernel unaligned access at TPC[47fab0]
trace_event_raw_event_workqueue_execute_end+0x50/0xa0
Dec 14 13:48:15 kernel: Kernel unaligned access at TPC[47faa4]
trace_event_raw_event_workqueue_execute_end+0x44/0xa0
Dec 14 13:48:15 kernel: OK
...
Dec 14 13:48:15 kernel: Testing event sched_waking: OK
Dec 14 13:48:15 kernel: Testing event sched_kthread_stop_ret:
Dec 14 13:48:15 kernel: log_unaligned: 401755 callbacks suppressed
Dec 14 13:48:15 kernel: Kernel unaligned access at TPC[f4c538]
function_test_events_call+0x84/0x188
Dec 14 13:48:15 kernel: Kernel unaligned access at TPC[f4c53c]
function_test_events_call+0x88/0x188
Dec 14 13:48:15 kernel: Kernel unaligned access at TPC[f4c538]
function_test_events_call+0x84/0x188
Dec 14 13:48:15 kernel: Kernel unaligned access at TPC[f4c53c]
function_test_events_call+0x88/0x188
Dec 14 13:48:15 kernel: Kernel unaligned access at TPC[f4c538]
function_test_events_call+0x84/0x188
Dec 14 13:48:15 kernel: OK
Dec 14 13:48:15 kernel: Testing event sched_kthread_stop: OK
...
full log is at https://gist.github.com/mator/a44eb39d5103aaaea2f1b2f3856c391d

Looking at the most encountered function list in dmesg (journalctl -b
-k) output:

$ zgrep 'Kernel unaligned access at TPC' kernel-ftrace.log.gz | awk
'{print $NF}' | cut -f1 -d'+' | sort | uniq -c
313 function_test_events_call
4 trace_event_raw_event_kmem_alloc
4 trace_event_raw_event_kmem_free
1 trace_event_raw_event_mm_page
1 trace_event_raw_event_mm_page_alloc
2 trace_event_raw_event_rcu_utilization
5 trace_event_raw_event_sched_switch
3 trace_event_raw_event_timer_class
2 trace_event_raw_event_timer_expire_entry
8 trace_event_raw_event_workqueue_execute_end
2 trace_event_raw_event_workqueue_execute_start
5 trace_function
Can someone look for unaligned access at least in
function_test_events_call() to fix it?

Thanks.

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