[PATCH] HWPOISON: add a pr_err message when forcibly send a sigbus

[Luck, Tony]

> + @Tony for ERST
> I found that after /dev/mcelog driver deprecated, both x86 and ARM64 platform does not
> support to collect MCE record of previous boot in persistent storage via APEI ERST.
> I propose to add a mechanism to do it for rasdaemon. Do you have any suggestion?

APEI ERST stored records should be available in /sys/fs/pstore after the system reboots.

Can rasdaemon collect them from there?

-Tony