From: Hannes Frederic Sowa <han...@stressinduktion.org> Date: Thu, 15 Oct 2015 14:07:04 +0200
> The idea of the overflow-arith.h header is to collect overflow checking > functions in one central place. > > If gcc compiler supports the __builtin_overflow_* builtins we use them > because they might give better performance, otherwise the code falls > back to normal overflow checking functions. > > The builtin_overflow functions are supported by gcc-5 and clang. The > matter of supporting clang is to just provide a corresponding > CC_HAVE_BUILTIN_OVERFLOW, because the specific overflow checking builtins > don't differ between gcc and clang. > > I just provide overflow_usub function here as I intend this to get merged > into net, more functions will definitely follow as they are needed. > > Signed-off-by: Hannes Frederic Sowa <han...@stressinduktion.org> I think a global helper interface like this should get a review on linux-kernel, so please at least let it get some exposure there first. You can ask whether it's OK to merge it via my tree since that'll have the first user. Thanks. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
