linux-kernel - Re: [PATCH v2] xen: Fix implicit type conversion

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Date:   Wed, 27 Oct 2021 09:21:55 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Jiamei Xie <Jiamei.Xie@....com>, Juergen Gross <jgross@...e.com>,
        Jiasheng Jiang <jiasheng@...as.ac.cn>,
        "sstabellini@...nel.org" <sstabellini@...nel.org>
Cc:     "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] xen: Fix implicit type conversion


On 10/26/21 5:59 AM, Jiamei Xie wrote:
>
>> -----Original Message-----
>> From: Xen-devel <xen-devel-bounces@...ts.xenproject.org> On Behalf Of
>> Juergen Gross
>> Sent: 2021年10月26日 15:36
>> To: Jiasheng Jiang <jiasheng@...as.ac.cn>; boris.ostrovsky@...cle.com;
>> sstabellini@...nel.org
>> Cc: xen-devel@...ts.xenproject.org; linux-kernel@...r.kernel.org
>> Subject: Re: [PATCH v2] xen: Fix implicit type conversion
>>
>> On 26.10.21 09:32, Jiasheng Jiang wrote:
>>> The variable 'i' is defined as UINT.
>>> However in the for_each_possible_cpu, its value is assigned to -1.
>>> That doesn't make sense and in the cpumask_next() it is implicitly
>>> type conversed to INT.
>>> It is universally accepted that the implicit type conversion is
>>> terrible.
>>> Also, having the good programming custom will set an example for
>>> others.
>>> Thus, it might be better to change the definition of 'i' from UINT
>>> to INT.
>>>
>>> Fixes: 3fac101 ("xen: Re-upload processor PM data to hypervisor after S3
>> resume (v2)")
>>> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
>> Reviewed-by: Juergen Gross <jgross@...e.com>
>>
>>
>> Juergen
> [Jiamei Xie]
> Reviewed-by: Jiamei Xie <jiamei.xie@....com>



Applied to for-linus-5.16


-boris