I've read kernel-hacking documentation that says you should never
initialize any member of a static struct to zero because it's already zero
from being in the BSS and if you initialize it, it gets pulled back into
the main data segment.
But the current GCC documentation states that the
-fzero-initialized-in-bss flag is on by default, with or without
optimization, and I haven't found -fno-zero-initialized-in-bss in the
build rules. So if a variable being initialized brings it back into data,
being initialized to zero should put it right back into bss.
So do we really need to avoid zero initialization with the modern GCC,
since the kernel source implicitly allows GCC-only extensions anyway?
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