building kernel with -O

[Valdis.Kletnieks at vt.edu]

On Wed, 30 Jul 2014 11:59:46 -0500, Xin Tong said:

> why can not __builtin_return_address() be made *never* inline and use

That's actually harder to accomplish than you might think.  And as a lot
of kernel developers like to say, -ENOPATCH.
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