linux-kernel - Re: [PATCH 3/3] early_printk: Add simple serialization to early

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Message-ID: <20171004145247.4tp6r6ds6e5pkut5@hirez.programming.kicks-ass.net>
Date:   Wed, 4 Oct 2017 16:52:47 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, pmladek@...e.com,
        sergey.senozhatsky@...il.com, linux-kernel@...r.kernel.org,
        mingo@...nel.org, tglx@...utronix.de
Subject: Re: [PATCH 3/3] early_printk: Add simple serialization to
 early_vprintk()

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.