On Thu, 25 Feb 2016, Huacai Chen wrote: > Yes, we can probe whether the platform support ei/di or not. But > whether use ei/di is not depend on runtime flag, but depend on > CONFIG_* in current kernel. So I have no idea how to use ei/di by > probing. OK, I think I have a full picture now. There's no need to probe, but I think the commit description and config text option are a bit misleading. This looks like the next architecture revision to me, much like MIPS32r1 vs MIPS32r2 for example, and it is quite normal that you don't probe for the new features it provides (even though -- sticking to the example -- we could probe for MIPS32r2 additions), but you just require whoever configures the kernel to choose the intended setup. IOW it's a design decision rather than a technical limitation. So may I suggest that you rewrite the relevant part of the help text to read: "This option enables those enhancements which are not probed at run time." or suchlike? And then similarly in the commit description. Thanks, Maciej
