linux-kernel - Re: [PATCH 4/5] cpuidle-haltpoll: add a check to ensure grow start value is nonzero

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Message-ID: <7245089f-788e-03d6-9833-6ce4d313f4ce@oracle.com>
Date:   Mon, 4 Nov 2019 10:56:32 +0800
From:   Zhenzhong Duan <zhenzhong.duan@...cle.com>
To:     Marcelo Tosatti <mtosatti@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        joao.m.martins@...cle.com, rafael.j.wysocki@...el.com,
        rkrcmar@...hat.com, pbonzini@...hat.com
Subject: Re: [PATCH 4/5] cpuidle-haltpoll: add a check to ensure grow start
 value is nonzero


On 2019/11/2 5:19, Marcelo Tosatti wrote:
> On Sat, Oct 26, 2019 at 11:23:58AM +0800, Zhenzhong Duan wrote:
>> dev->poll_limit_ns could be zeroed in certain cases (e.g. by
>> guest_halt_poll_shrink). If guest_halt_poll_grow_start is zero,
>> dev->poll_limit_ns will never be larger than zero.
>>
>> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@...cle.com>
>> ---
>>   drivers/cpuidle/governors/haltpoll.c | 15 ++++++++++++---
>>   1 file changed, 12 insertions(+), 3 deletions(-)
> I would rather disallow setting grow_start to zero rather
> than silently setting it to one on the back of the user.

Ok, will do.

Thanks

Zhenzhong