linux-kernel - Re: [PATCH 03/15] hyperv: use standard bitops

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Date:   Thu, 22 Dec 2016 13:33:54 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Roman Kagan <rkagan@...tuozzo.com>, Olaf Hering <olaf@...fle.de>,
        Radim Krčmář <rkrcmar@...hat.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Haiyang Zhang <haiyangz@...rosoft.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
        "Denis V . Lunev" <den@...nvz.org>
Subject: Re: [PATCH 03/15] hyperv: use standard bitops



On 21/12/2016 14:23, Roman Kagan wrote:
> On Wed, Dec 21, 2016 at 01:00:44PM +0100, Olaf Hering wrote:
>> On Tue, Dec 20, Roman Kagan wrote:
>>
>> Reverting commit 22356585712d ("staging: hv: use sync_bitops when
>> interacting with the hypervisor") is save because .......
>>
>>> -		sync_set_bit(channel->monitor_bit,
>>> +		set_bit(channel->monitor_bit,
> 
> It isn't indeed.  I didn't realize there was a UP case where it made a
> difference, and failed to locate the commit where it changed.
> 
> I'll drop this part, thanks.

Perhaps the sync_bitops should be renamed to virt_bitops.  This would
match virt_* memory barriers and would make their usage much more obvious.

Paolo