doc?

[wangyanqing]

Hello, all!
Today when I look into dumpstack of x86,
I get %pB format specifier, and I don't
know what it is. But I can't find the information
from Documentation/printk-formats.txt. Yes, I
get the introduce from "git annotate and git log",
but I thinks It will be better if patches authors will 
add some documentation, right?
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