4917fcb58c
Kernel crashes if power pmu is not registered and user tries to dump
regs with 'echo p > /proc/sysrq-trigger'. Sample log:
Unable to handle kernel paging request for data at address 0x00000008
Faulting instruction address: 0xc0000000000d52f0
NIP [c0000000000d52f0] perf_event_print_debug+0x10/0x230
LR [c00000000058a938] sysrq_handle_showregs+0x38/0x50
Call Trace:
printk+0x38/0x4c (unreliable)
__handle_sysrq+0xe4/0x270
write_sysrq_trigger+0x64/0x80
proc_reg_write+0x80/0xd0
__vfs_write+0x40/0x200
vfs_write+0xc8/0x240
SyS_write+0x60/0x110
system_call+0x58/0x6c
Fixes:
|
||
---|---|---|
.. | ||
req-gen | ||
8xx-pmu.c | ||
Makefile | ||
bhrb.S | ||
callchain.c | ||
core-book3s.c | ||
core-fsl-emb.c | ||
e500-pmu.c | ||
e6500-pmu.c | ||
hv-24x7-catalog.h | ||
hv-24x7-domains.h | ||
hv-24x7.c | ||
hv-24x7.h | ||
hv-common.c | ||
hv-common.h | ||
hv-gpci-requests.h | ||
hv-gpci.c | ||
hv-gpci.h | ||
imc-pmu.c | ||
isa207-common.c | ||
isa207-common.h | ||
mpc7450-pmu.c | ||
perf_regs.c | ||
power4-pmu.c | ||
power5+-pmu.c | ||
power5-pmu.c | ||
power6-pmu.c | ||
power7-events-list.h | ||
power7-pmu.c | ||
power8-events-list.h | ||
power8-pmu.c | ||
power9-events-list.h | ||
power9-pmu.c | ||
ppc970-pmu.c |