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From: Minfei Huang <mnghuan@gmail.com>
To: Borislav Petkov <bp@suse.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
	luto@kernel.org, hpa@zytor.com, mingo@redhat.com,
	tglx@linutronix.de, x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/3 V2] pvclock: Get rid of __pvclock_read_cycles in function pvclock_read_flags
Date: Sun, 12 Jun 2016 19:46:47 +0800	[thread overview]
Message-ID: <20160612114643.GA24066@localhost> (raw)
In-Reply-To: <20160609112807.GB12860@pd.tnic>

On 06/09/16 at 01:28P, Borislav Petkov wrote:
> On Thu, Jun 09, 2016 at 01:21:18PM +0200, Paolo Bonzini wrote:
> > This is basically implementing a seqcount.  It needs two barriers and,
> 
> Why does it need the two barriers? More details please.

Hi, Borislav.

It's a seqcount-like. We should confirm that reading flags occurs
between two reading version. To make complier do not reorder, two
barriers are necessary.

Thanks
Minfei

  parent reply	other threads:[~2016-06-12 11:46 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-27  6:17 [PATCH 1/3] pvclock: Add CPU barries to get correct version value Minfei Huang
2016-05-27  6:17 ` [PATCH 2/3] pvclock: Cleanup to remove function pvclock_get_nsec_offset Minfei Huang
2016-05-27 15:40   ` Andy Lutomirski
2016-05-27  6:17 ` [PATCH 3/3] pvclock: Add a new wrapper function to only get variable flags Minfei Huang
2016-05-27 15:40   ` Andy Lutomirski
2016-05-27 16:06     ` Paolo Bonzini
2016-05-28 12:02       ` Minfei Huang
2016-05-28 12:27   ` [PATCH 3/3 V2] pvclock: Get rid of __pvclock_read_cycles in function pvclock_read_flags Minfei Huang
2016-06-07 13:16     ` Minfei Huang
2016-06-09 11:17       ` Paolo Bonzini
2016-06-08  8:17     ` Borislav Petkov
2016-06-09 11:21       ` Paolo Bonzini
2016-06-09 11:28         ` Borislav Petkov
2016-06-09 12:31           ` Paolo Bonzini
2016-06-12 11:46           ` Minfei Huang [this message]
2016-06-09 12:16     ` Peter Zijlstra
2016-06-09 12:24       ` Peter Zijlstra
2016-06-09 12:26       ` Paolo Bonzini
2016-06-09 12:35         ` Peter Zijlstra
2016-05-27 15:39 ` [PATCH 1/3] pvclock: Add CPU barries to get correct version value Andy Lutomirski

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