Re: [tip:locking/core 9/11] include/asm-generic/atomic-instrumented.h:288:24: sparse: cast truncates bits from constant value (100 becomes 0)

[Peter Zijlstra]

On Tue, Mar 13, 2018 at 07:00:17PM +0100, Luc Van Oostenryck wrote:
> The issue here is that sparse has a whole class of warnings that are
> given very early (here at expansion of constant expressions), before
> eliminating code from branches that are never taken (which, surprise,
> need itself to have constant expressions already expanded).
> 
> It's often annoying like the case here.
> OTOH, I don't think it's always a bad thing. Sometimes we want to
> have warnings even from code we know will not be executed (in this
> config but maybe it will in another one).

Is that really a valid concern with all the automated randconfig
building going on today?