extreme RTAS printks

[Nathan Lynch]

Hollis Blanchard wrote:
> Could we *please* kill printk_log_rtas()? This data is available via
> /proc files; there is no need to spam our boot logs with it.

How about making it a config option?  Patch attached.  I'm not sure the
help text is 100% correct - do RAS tools depend on the messages being in
dmesg output or do they look at the /proc files?

Another idea is changing the log level of these messages from KERN_ERR
to something lower priority like KERN_INFO or KERN_DEBUG.  At least that
way the console doesn't get spammed in default configurations.

Nathan
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