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From:   Thomas Gleixner <tglx@linutronix.de>
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To:     Peter Zijlstra <peterz@infradead.org>
Cc:     "Luck, Tony" <tony.luck@intel.com>, hdegoede@redhat.com,
        markgross@kernel.org, mingo@redhat.com, bp@alien8.de,
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        corbet@lwn.net, gregkh@linuxfoundation.org,
        andriy.shevchenko@linux.intel.com, jithu.joseph@intel.com,
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        linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
        platform-driver-x86@vger.kernel.org, patches@lists.linux.dev,
        ravi.v.shankar@intel.com
Subject: Re: [PATCH v5 07/10] platform/x86/intel/ifs: Add scan test support
In-Reply-To: <20220505082824.GD2501@worktop.programming.kicks-ass.net>
References: <20220422200219.2843823-1-tony.luck@intel.com>
 <20220428153849.295779-1-tony.luck@intel.com>
 <20220428153849.295779-8-tony.luck@intel.com> <87r159jxaq.ffs@tglx>
 <YnLLekoripdY2oQU@agluck-desk3.sc.intel.com> <87tua4j3es.ffs@tglx>
 <20220505082824.GD2501@worktop.programming.kicks-ass.net>
Date:   Thu, 05 May 2022 11:01:27 +0200
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On Thu, May 05 2022 at 10:28, Peter Zijlstra wrote:
> On Thu, May 05, 2022 at 01:15:07AM +0200, Thomas Gleixner wrote:
>> We don't have stomp_cpumask() today, but that's trivial enough to
>> implement.
>
> I don't think we want to gift people a random cpumask stop_machine(),

Fair enough.

> but here's one that stops a core. It runs the @fn on every cpu since I
> thought to have understood that was the requirement for this muck.

Yes.

> *completely* untestededed.

Looks about right neverthelessesseess.