linux-kernel - Re: [PATCH v1 1/3] cpufreq: intel_pstate: Always read hwp_cap_cached with READ

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Date:   Fri, 8 Jan 2021 15:02:11 +0800
From:   Chen Yu <yu.c.chen@...el.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Linux PM <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: Re: [PATCH v1 1/3] cpufreq: intel_pstate: Always read hwp_cap_cached
 with READ_ONCE()

On Thu, Jan 07, 2021 at 07:42:15PM +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Because intel_pstate_get_hwp_max() which updates hwp_cap_cached
> may run in parallel with the readers of it, annotate all of the
> read accesses to it with READ_ONCE().
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Tested-by: Chen Yu <yu.c.chen@...el.com>

thanks,
Chenyu