On Fri, Mar 9, 2018 at 4:32 PM, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> I wonder which gcc versions actually accept Kees's addition.
Note that we already do have this pattern, as seen by:
git grep -2 __builtin_choose_expr | grep -2 __builtin_constant_p
which show drivers/pinctrl/intel/pinctrl-intel.h, so the pattern
already exists current kernels and _works_ - it apparently just
doesn't work in slightly more complicated cases.
It's one reason why I wondered if simplifying the expression to have
just that single __builtin_constant_p() might not end up working..
Linus
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