On Thu, May 12, 2016 at 12:24:25PM +0530, Vineet Gupta wrote: > On Thursday 12 May 2016 12:12 PM, Peter Zijlstra wrote: > >> Tried that and doesn't even compile. Reconfirms what Vince said, ENOTSUPP is not > >> > exposed to userspace (being in include/linux and not include/uapi/linux) > > Durr, so what does userspace see? > > It sees the "value" of ENOTSUPP, i.e. 524 but there is no symbolic reference to it :-) Ah.. which might be a hint that nobody is actually explicitly testing for this and we might just get away with changing the ABI. Vince, what say you; shall we try and get away with it? ;-)
