Re: [PATCH v3 3/3] printk: use the lockless ringbuffer

[lijiang]

å 2020å07æ03æ 19:54, John Ogness åé:
> On 2020-07-02, lijiang <lijiang@xxxxxxxxxx> wrote:
>> About the VMCOREINFO part, I made some tests based on the kernel patch
>> v3, the makedumpfile and crash-utility can work as expected with your
>> patch(userspace patch), but, unfortunately, the
>> vmcore-dmesg(kexec-tools) can't correctly read the printk ring buffer
>> information, and get the following error:
>>
>> "Missing the log_buf symbol"
>>
>> The kexec-tools(vmcore-dmesg) should also have a similar patch, just like
>> in the makedumpfile and crash-utility.
> 
> A patched kexec-tools is available here [0].
> 
> I did not test using 32-bit dumps on 64-bit machines and vice versa. But
> it should work.
> 
> John Ogness
> 
> [0] https://github.com/Linutronix/kexec-tools.git (printk branch)
> 

After applying this patch, the vmcore-dmesg can work.

Thank you, John Ogness.