From: Vineeth Vijayan <vneethv@linux.ibm.com>
To: Heiko Carstens <hca@linux.ibm.com>, jing yangyang <cgel.zte@gmail.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Jiapeng Zhong <abaci-bugfix@linux.alibaba.com>,
linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
jing yangyang <jing.yangyang@zte.com.cn>,
Zeal Robot <zealci@zte.com.cn>
Subject: Re: [PATCH linux-next] s390:fix Coccinelle warnings
Date: Tue, 31 Aug 2021 08:15:48 +0200 [thread overview]
Message-ID: <afd3887e-11e2-1f03-4d40-bae38b28991f@linux.ibm.com> (raw)
In-Reply-To: <YSPj/YRDlGqoVu26@osiris>
I am a fan of Coccinelle fixes. But, here i think we need to do more
work than just fixing it to
get rid of the warnings. I agree with Heiko. May be we should re-write
this entire function and
make it readable.
Nack.
On 8/23/21 8:07 PM, Heiko Carstens wrote:
> On Thu, Aug 19, 2021 at 07:51:59PM -0700, jing yangyang wrote:
>> WARNING !A || A && B is equivalent to !A || B
>>
>> This issue was detected with the help of Coccinelle.
>>
>> Reported-by: Zeal Robot <zealci@zte.com.cn>
>> Signed-off-by: jing yangyang <jing.yangyang@zte.com.cn>
>> ---
>> arch/s390/include/asm/scsw.h | 5 ++---
>> 1 file changed, 2 insertions(+), 3 deletions(-)
>>
>> diff --git a/arch/s390/include/asm/scsw.h b/arch/s390/include/asm/scsw.h
>> index a7c3ccf..754122d 100644
>> --- a/arch/s390/include/asm/scsw.h
>> +++ b/arch/s390/include/asm/scsw.h
>> @@ -691,9 +691,8 @@ static inline int scsw_tm_is_valid_pno(union scsw *scsw)
>> {
>> return (scsw->tm.fctl != 0) &&
>> (scsw->tm.stctl & SCSW_STCTL_STATUS_PEND) &&
>> - (!(scsw->tm.stctl & SCSW_STCTL_INTER_STATUS) ||
>> - ((scsw->tm.stctl & SCSW_STCTL_INTER_STATUS) &&
>> - (scsw->tm.actl & SCSW_ACTL_SUSPENDED)));
>> + (!(scsw->tm.stctl & SCSW_STCTL_INTER_STATUS) ||
>> + (scsw->tm.actl & SCSW_ACTL_SUSPENDED));
> This turns something unreadable into something else which is
> unreadable. It's up to Vineeth to decide what to do with this.
>
> However I'd prefer if this would be changed into something readable,
> maybe as addon patch, like e.g.:
>
> static inline bool scsw_tm_is_valid_pno(union scsw *scsw)
> {
> if (scsw->tm.fctl == 0)
> return false;
> if (!(scsw->tm.stctl & SCSW_STCTL_STATUS_PEND))
> return false;
> if (!(scsw->tm.stctl & SCSW_STCTL_INTER_STATUS))
> return false;
> if (scsw->tm.actl & SCSW_ACTL_SUSPENDED)
> return false;
> return true;
> }
>
> Chances are that the above is wrong... it's just to illustrate ;)
prev parent reply other threads:[~2021-08-31 6:15 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-20 2:51 [PATCH linux-next] s390:fix Coccinelle warnings jing yangyang
2021-08-23 18:07 ` Heiko Carstens
2021-08-31 6:15 ` Vineeth Vijayan [this message]
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