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SubjectRe: UBSAN: Undefined behaviour in arch/x86/events/intel/p6.c:116:29
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> Does something like so fix it?

Unfortunately not (tested on top of todays git):

[ 0.000000] Linux version 5.4.0-11180-g76bb8b05960c-dirty (mroos@d600) (gcc version 9.2.1 20191109 (Debian 9.2.1-19)) #20 Tue Dec 3 15:14:51 EET 2019
[...]
[ 8.774201] ================================================================================
[ 8.774256] UBSAN: Undefined behaviour in arch/x86/events/intel/p6.c:116:29
[ 8.774297] index 8 is out of range for type 'u64 [8]'
[ 8.774341] CPU: 0 PID: 1 Comm: swapper Not tainted 5.4.0-11180-g76bb8b05960c-dirty #20
[ 8.774345] Hardware name: Dell Computer Corporation Latitude D600 /0X2034, BIOS A16 06/29/2005
[ 8.774349] Call Trace:
[ 8.774368] dump_stack+0x16/0x19
[ 8.774377] ubsan_epilogue+0xb/0x29
[ 8.774384] __ubsan_handle_out_of_bounds.cold+0x43/0x48
[ 8.774396] ? sysfs_add_file_mode_ns+0xad/0x180
[ 8.774406] p6_pmu_event_map+0x3b/0x50
[ 8.774413] is_visible+0x25/0x30
[ 8.774419] ? collect_events+0x150/0x150
[ 8.774425] internal_create_group+0xd8/0x3e0
[ 8.774431] ? collect_events+0x150/0x150
[ 8.774438] internal_create_groups.part.0+0x34/0x80
[ 8.774444] sysfs_create_groups+0x10/0x20
[ 8.774454] device_add+0x62a/0x710
[ 8.774463] ? kvasprintf_const+0x59/0x90
[ 8.774471] ? kfree_const+0xf/0x30
[ 8.774479] ? kobject_set_name_vargs+0x6a/0xa0
[ 8.774489] pmu_dev_alloc+0x8e/0xe0
[ 8.774497] perf_event_sysfs_init+0x40/0x78
[ 8.774503] ? stack_map_init+0x17/0x17
[ 8.774508] do_one_initcall+0x7a/0x1b3
[ 8.774519] ? do_early_param+0x75/0x75
[ 8.774528] kernel_init_freeable+0x1ae/0x230
[ 8.774537] ? rest_init+0x6d/0x6d
[ 8.774544] kernel_init+0x9/0xf3
[ 8.774550] ? rest_init+0x6d/0x6d
[ 8.774556] ret_from_fork+0x2e/0x38
[ 8.774562] ================================================================================
[ 8.774606] ================================================================================
[ 8.774649] UBSAN: Undefined behaviour in arch/x86/events/intel/p6.c:116:29
[ 8.774690] load of address (ptrval) with insufficient space
[ 8.774727] for an object of type 'const u64'
[ 8.774765] CPU: 0 PID: 1 Comm: swapper Not tainted 5.4.0-11180-g76bb8b05960c-dirty #20
[ 8.774768] Hardware name: Dell Computer Corporation Latitude D600 /0X2034, BIOS A16 06/29/2005
[ 8.774771] Call Trace:
[ 8.774777] dump_stack+0x16/0x19
[ 8.774783] ubsan_epilogue+0xb/0x29
[ 8.774789] ubsan_type_mismatch_common.cold+0xd6/0xdb
[ 8.774797] __ubsan_handle_type_mismatch_v1+0x2d/0x40
[ 8.774804] p6_pmu_event_map+0x4b/0x50
[ 8.774809] is_visible+0x25/0x30
[ 8.774815] ? collect_events+0x150/0x150
[ 8.774820] internal_create_group+0xd8/0x3e0
[ 8.774826] ? collect_events+0x150/0x150
[ 8.774833] internal_create_groups.part.0+0x34/0x80
[ 8.774839] sysfs_create_groups+0x10/0x20
[ 8.774846] device_add+0x62a/0x710
[ 8.774854] ? kvasprintf_const+0x59/0x90
[ 8.774859] ? kfree_const+0xf/0x30
[ 8.774865] ? kobject_set_name_vargs+0x6a/0xa0
[ 8.774873] pmu_dev_alloc+0x8e/0xe0
[ 8.774879] perf_event_sysfs_init+0x40/0x78
[ 8.774884] ? stack_map_init+0x17/0x17
[ 8.774890] do_one_initcall+0x7a/0x1b3
[ 8.774897] ? do_early_param+0x75/0x75
[ 8.774906] kernel_init_freeable+0x1ae/0x230
[ 8.774913] ? rest_init+0x6d/0x6d
[ 8.774920] kernel_init+0x9/0xf3
[ 8.774926] ? rest_init+0x6d/0x6d
[ 8.774932] ret_from_fork+0x2e/0x38
[ 8.774937] ================================================================================

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