Re: [PATCH v2] mm: hwpoison: coredump: support recovery from dump_user_range()

[Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>]

On 2023/4/27 10:31, HORIGUCHI NAOYA(堀口 直也) wrote:
> On Thu, Apr 27, 2023 at 09:06:46AM +0800, Kefeng Wang wrote:
> >
...
> > For coredump，the task work will be called too, see following code,
> >
> > get_signal
> > 	sig_kernel_coredump
> > 		elf_core_dump
> > 			dump_user_range
> > 				_copy_from_iter // with MC-safe copy, return without panic
> > 	do_group_exit(ksig->info.si_signo);
> > 		do_exit
> > 			exit_task_work
> > 				task_work_run
> > 					kill_me_never
> > 						memory_failure
> >
> > I also add debug print to check the memory_failure() processing after
> > add MCE_IN_KERNEL_COPYIN to MCE_SAFE exception type, also tested CoW of
> > normal page and huge page, it works too.
>
> Sounds nice to me.
> Maybe this information is worth documenting in the patch description.

Sure, will make a formal patch and send out, thanks.

> Thanks,
> Naoya Horiguchi