Re: [Xen-devel] [PATCH] domain.c idle_loop declaration (take 2)

[Adam Sulmicki <adam@xxxxxxxxxxxx>]

> Some further analysis, with much help from Jimmy Xenidis of IBM
> research, shows that the problem was not the declaration of the function
> as static void, but that the compiler is optimizing the function out of
> the assembled code.
> The compiler is probably correct in optimizing out the function. It is 
> only called through inline assembly, and it is static void. Further 
> experiments with -02 -01 and -0s also cause idle_loop to be optimized 
> out.
interesting analysis

> It is a good idea to keep idle_loop declared static void. The patch
> simply includes a declaration using __attribute__ ((used)) that prevents
> the compiler from optimizing out the function.
ah, using "__attribute__ used" was able to find it on google. if anyone 
cares the url is
http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function-Attributes

Still I wonder how it will interact with plan9 since I think plan9 uses 
own compile some part of the code.. not totally sure though.
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