Re: [PATCH] sched: Align rq->avg_idle and rq->avg_scan_cost

[Peter Zijlstra]

On Mon, Mar 30, 2020 at 10:01:27AM +0100, Valentin Schneider wrote:
> 
> """
> The result of E1 >> E2 is E1 right-shifted E2 bit positions. [...] If E1
> has a signed type and a negative value, the resulting value is
> implementation-defined.

True; but the kernel uses -fwrapv, which would mandate 2s complement,
which then gets us to the next point:

> """
> 
> Not only this, but (arithmetic) right shifting a negative value (using 2's
> complement) is *not* equivalent to dividing it by the corresponding power
> of 2. 

True; good catch.