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SubjectRe: powerpc/sysrq: Fix oops whem ppmu is not registered
Date
On Tue, 2017-09-19 at 06:17:06 UTC, Ravi Bangoria wrote:
> 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
>
> Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
> Reviewed-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/4917fcb58cc73f6b81455e3c5f9601

cheers

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