Re: [PATCH 3/3] early_printk: Add simple serialization to early_vprintk()

From: Peter Zijlstra
Date: Wed Oct 04 2017 - 10:53:02 EST

On Wed, Oct 04, 2017 at 10:43:54AM -0400, Steven Rostedt wrote:
> My question is not about ordering, but about coherency. Can you have
> one CPU read a variable that goes into cache, and keep using the cached
> variable every time the program asks to read it, instead of going out
> to memory.

No, not on a coherent system.