[PATCH 1/2] kexec: add a dummy note for each offline cpu

Xunlei Pang xpang at redhat.com
Wed Dec 14 15:49:15 PST 2016

On 12/14/2016 at 05:13 PM, Liu ping fan wrote:
> [...]
>>> No. This patch just place a mark on these offline cpu. The next patch
>>> for capture kernel will recognize this case, and ignore this kind of
>>> pt_note by the code:
>>> real_sz = 0; // although the size of this kind of PT_NOTE is not zero,
>>> but it contains nothing useful, so just ignore it
>>> phdr_ptr->p_memsz = real_sz
>> If there is any other vmcore functional issue besides throwing "Warning: Zero PT_NOTE entries found"?
> Not at present when I debugged.

Well, agree that we should fix it given that it produces many unnecessary warnings on some machines.

> I just think we can not suppose the behaviour of different archs, so
> just mark out the dummy pt_note. If some archs want to use these notes
> memory,
> they will just overwrite the dummy.

For cpu crash_notes, it should be arch-independent, and related to elf format.

> Thx,
> Pingfan
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