Peter, Hendrik,
commit 26657848502b ("perf/core: Verify we have a single perf_hw_context PMU") seems to
trigger the newly created warning on a z196.
[ 2.202363] ------------[ cut here ]------------
[ 2.202372] WARNING: CPU: 5 PID: 1 at kernel/events/core.c:8485 perf_pmu_register+0x420/0x428
[ 2.202373] Modules linked in:
[ 2.202377] CPU: 5 PID: 1 Comm: swapper/0 Not tainted 4.7.0-rc1+ #2
[ 2.202379] task: 00000009c5240000 ti: 00000009c5234000 task.ti: 00000009c5234000
[ 2.202381] Krnl PSW : 0704c00180000000 0000000000220c50 (perf_pmu_register+0x420/0x428)
[ 2.202385] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 RI:0 EA:3
Krnl GPRS: ffffffffffffffff 0000000000b15ac6 0000000000000000 00000009cb440000
[ 2.202388] 000000000022087a 0000000000000000 0000000000b78fa0 0000000000000000
[ 2.202390] 0000000000a9aa90 0000000000000084 0000000000000005 000000000088a97a
[ 2.202405] 0000000000000004 0000000000749dd0 000000000022087a 00000009c5237cc0
[ 2.202415] Krnl Code: 0000000000220c44: a7f4ff54 brc 15,220aec
0000000000220c48: 92011000 mvi 0(%r1),1
#0000000000220c4c: a7f40001 brc 15,220c4e
>0000000000220c50: a7f4ff12 brc 15,220a74
0000000000220c54: 0707 bcr 0,%r7
0000000000220c56: 0707 bcr 0,%r7
0000000000220c58: ebdff0800024 stmg %r13,%r15,128(%r15)
0000000000220c5e: a7f13fe0 tmll %r15,16352
[ 2.202431] Call Trace:
[ 2.202433] ([<000000000022087a>] perf_pmu_register+0x4a/0x428)
[ 2.202438] ([<0000000000b2c25c>] init_cpum_sampling_pmu+0x14c/0x1f8)
[ 2.202441] ([<0000000000100248>] do_one_initcall+0x48/0x140)
[ 2.202444] ([<0000000000b25d26>] kernel_init_freeable+0x1e6/0x2a0)
[ 2.202449] ([<000000000072bda4>] kernel_init+0x24/0x138)
[ 2.202453] ([<000000000073495e>] kernel_thread_starter+0x6/0xc)
[ 2.202455] ([<0000000000734958>] kernel_thread_starter+0x0/0xc)
[ 2.202456] Last Breaking-Event-Address:
[ 2.202458] [<0000000000220c4c>] perf_pmu_register+0x41c/0x428
[ 2.202460] ---[ end trace 0c6ef9f5b771ad97 ]---
Looks like perf_pmu_register does not like to be called twice (once for the counter
and once for the sampling facility).
Christian
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