On Mon, 6 Jan 2014, Johannes Berg wrote:

On Tue, 2013-12-31 at 17:40 +0100, Julia Lawall wrote:

quoted

quoted

If nothing else, then some run-time code that calculates the offset off
and asserts if it is broken in module initialization or similar might
be good enough.

Could be OK.  Something right in or after the structure declaration would
be nicest.

I don't think you can put a BUILD_BUG_ON() into the structure
declaration (it's code, not declarations), but I think you could just
put

BUILD_BUG_ON(sizeof(struct foo) - offsetof(struct foo, addr) < 8);

with the user(s?) and that should catch the scenario I was worrying
about?

OK, thanks.  That is what I had in mind.  But I was hoping to be able to
put it with the structure.  Perhaps there is a way to make a macro that
expands to a dummy function that contains the BUILD_BUG_ON?  But I guess
that would waste space?

I think that 8 should be 16?

julia
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