linux-kernel - Re: [PATCH for 4.16 07/10] x86: Introduce sync_core_before

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Date:   Tue, 16 Jan 2018 19:28:07 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
cc:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        Andy Lutomirski <luto@...nel.org>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Andrew Hunter <ahh@...gle.com>,
        Maged Michael <maged.michael@...il.com>,
        Avi Kivity <avi@...lladb.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Dave Watson <davejwatson@...com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Andrea Parri <parri.andrea@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Greg Hackmann <ghackmann@...gle.com>,
        Will Deacon <will.deacon@....com>,
        David Sehr <sehr@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>, x86@...nel.org,
        linux-arch@...r.kernel.org
Subject: Re: [PATCH for 4.16 07/10] x86: Introduce sync_core_before_usermode
 (v2)

On Mon, 15 Jan 2018, Mathieu Desnoyers wrote:

> Introduce an architecture function that ensures the current CPU
> issues a core serializing instruction before returning to usermode.
> 
> This is needed for the membarrier "sync_core" command.
> 
> Architectures defining the sync_core_before_usermode() static inline
> need to select ARCH_HAS_SYNC_CORE_BEFORE_USERMODE.

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>