linux-kernel - Re: [PATCH v6 03/11] stop_machine: Add stop_core

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Date:   Fri, 06 May 2022 10:20:23 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Tony Luck <tony.luck@...el.com>, hdegoede@...hat.com,
        markgross@...nel.org
Cc:     mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        x86@...nel.org, hpa@...or.com, corbet@....net,
        gregkh@...uxfoundation.org, andriy.shevchenko@...ux.intel.com,
        jithu.joseph@...el.com, ashok.raj@...el.com, tony.luck@...el.com,
        rostedt@...dmis.org, dan.j.williams@...el.com,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, patches@...ts.linux.dev,
        ravi.v.shankar@...el.com, Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v6 03/11] stop_machine: Add stop_core_cpuslocked() for
 per-core operations

On Thu, May 05 2022 at 18:40, Tony Luck wrote:
> From: Peter Zijlstra <peterz@...radead.org>
>
> Hardware core level testing features require near simultaneous execution
> of WRMSR instructions on all threads of a core to initiate a test.
>
> Provide a customized cut down version of stop_machine_cpuslocked() that
> just operates on the threads of a single core.
>
> Suggested-by: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> Signed-off-by: Tony Luck <tony.luck@...el.com>

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