[Syllable-kernel] patch to fix crash when kernel compiled with -O2 or less

[Jake H. <jh...@an...>]

One more patch for today.  I tried building the kernel with "-O2" 
instead of "-O3" and got an illegal instruction crash at the beginning 
of the init process (before it prints anything).  I looked at the 
difference in assembly output in kernel/init.c and noticed that the 
Fork() function is inlined under -O3.  Since Fork() doesn't seem to be 
used anywhere outside of init.c, I changed it to a static inline 
function and commented out the prototype in include/atheos/kernel.h. 
This fixed the problem, and makes things cleaner since the function 
consists of only a single line of inline asm.

BTW, I would suggest using CFLAGS of "-O2 -mpreferred-stack-boundary=2", 
as Linux and FreeBSD do, instead of "-O3" when building the kernel 
because smaller code size is generally more important than the 
additional inlining.  Using the "size" command on kernel.so, I get a 
text size (data and bss sizes are the same) of:

378602 bytes for -O3
363546 bytes for -O2 -mpreferred-stack-boundary=2

for a savings of 15K or about 4%.  Anyway, here's the patch.

--
Jake Hamby