On 02/14/2017 04:39 AM, Peter Zijlstra wrote: > On Mon, Feb 13, 2017 at 05:34:01PM -0500, Waiman Long wrote: >> It is the address of &steal_time that will exceed the 32-bit limit. > That seems extremely unlikely. That would mean we have more than 4G > worth of per-cpu variables declared in the kernel. I have some doubt about if the compiler is able to properly use RIP-relative addressing for this. Anyway, it seems like constraints aren't allowed for asm() when not in the function context, at least for the the compiler that I am using (4.8.5). So it is a moot point. Cheers, Longman
