optimization in kernel compile

[Valdis.Kletnieks at vt.edu]

On Fri, 22 Mar 2013 13:41:25 +0800, ishare said:
>   Is it  needed or must to compile fs and driver with -O2 option when compiling kernel ?

It's not strictly mandatory to use -O2 (for a while, -Os was the default). There
are a few places that for correctness, you *cannot* use -O0. For instance, a
few places where we use builtin_return_address() inside an inline (-O0
won't inline so builtin_return_address() ends up returning a pointer to
a function when we want the function's parent).

Since gdb and friends are able to deal with -O2 compiled code just fine,
there's really no reason *not* to optimize the kernel.
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