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From: Thomas Gleixner <tglx@linutronix.de>
To: "Liang, Kan" <kan.liang@intel.com>
Cc: "peterz@infradead.org" <peterz@infradead.org>,
	"mingo@redhat.com" <mingo@redhat.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"bp@alien8.de" <bp@alien8.de>,
	"acme@kernel.org" <acme@kernel.org>,
	"eranian@google.com" <eranian@google.com>,
	"jolsa@kernel.org" <jolsa@kernel.org>,
	"ak@linux.intel.com" <ak@linux.intel.com>
Subject: RE: [PATCH V3 1/2] x86/msr: add msr_set/clear_bit_on_cpu/cpus access functions
Date: Tue, 28 Mar 2017 20:34:14 +0200 (CEST)	[thread overview]
Message-ID: <alpine.DEB.2.20.1703282032430.2432@nanos> (raw)
In-Reply-To: <37D7C6CF3E00A74B8858931C1DB2F077536C63BB@SHSMSX103.ccr.corp.intel.com>

On Tue, 28 Mar 2017, Liang, Kan wrote:
> Thanks. It simplify the code very much.
> I think we still need to protect the smp_call_function in the driver, right?

Yes.

> Would be the following code enough?
> 
> get_online_cpus();
> preempt_disable();

Only get_online_cpus(). smp_call_function() disables preemption internaly.

Thanks,

	tglx

  reply	other threads:[~2017-03-28 18:34 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-27 18:30 [PATCH V3 0/2] measure SMI cost (kernel) kan.liang
2017-03-27 18:30 ` [PATCH V3 1/2] x86/msr: add msr_set/clear_bit_on_cpu/cpus access functions kan.liang
2017-03-28  8:36   ` Thomas Gleixner
2017-03-28 17:23     ` Thomas Gleixner
2017-03-28 17:38       ` Liang, Kan
2017-03-28 18:34         ` Thomas Gleixner [this message]
2017-03-27 18:30 ` [PATCH V3 2/2] perf/x86: add sysfs entry to freeze counter on SMI kan.liang
2017-03-28  8:42   ` Thomas Gleixner
2017-03-28 13:23     ` Liang, Kan
2017-03-28 17:03       ` Thomas Gleixner

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