linux-kernel - Re: [Patch v4 08/18] sched: Deprecate sched_smt_present and use cpu_smt

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Date:   Sat, 3 Nov 2018 19:20:09 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Tim Chen <tim.c.chen@...ux.intel.com>
cc:     Jiri Kosina <jikos@...nel.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Casey Schaufler <casey.schaufler@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Jon Masters <jcm@...hat.com>,
        Waiman Long <longman9394@...il.com>,
        linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [Patch v4 08/18] sched: Deprecate sched_smt_present and use
 cpu_smt_enabled static key

Tim,

On Tue, 30 Oct 2018, Tim Chen wrote:

> The cpu_smt_enabled static key serves identical purpose as cpu_smt_enabled

That doesn't make any sense.

> to enable SMT specific code.
> 
> This patch replaces sched_smt_present in the scheduler with
> cpu_smt_enabled and deprecate sched_smt_present.

It's not deprecating it, it's replacing and removing it and thereby
breaking all architectures which select SCHED_SMT except x86.

Thanks,

	tglx