linux-kernel - Re: [PATCH] KVM: s390: pci: fix plain integer as NULL pointer warnings

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Message-ID: <68b0e84f-38fd-fdca-f2f0-ba664b44d1d3@linux.ibm.com>
Date:   Thu, 15 Sep 2022 18:28:32 +0200
From:   Christian Borntraeger <borntraeger@...ux.ibm.com>
To:     Matthew Rosato <mjrosato@...ux.ibm.com>,
        linux-s390@...r.kernel.org, frankja@...ux.ibm.com
Cc:     farman@...ux.ibm.com, schnelle@...ux.ibm.com, pmorel@...ux.ibm.com,
        imbrenda@...ux.ibm.com, david@...hat.com, hca@...ux.ibm.com,
        gor@...ux.ibm.com, gerald.schaefer@...ux.ibm.com,
        agordeev@...ux.ibm.com, svens@...ux.ibm.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] KVM: s390: pci: fix plain integer as NULL pointer
 warnings



Am 15.09.22 um 18:16 schrieb Christian Borntraeger:
> Am 23.08.22 um 21:18 schrieb Matthew Rosato:
>> On 8/23/22 3:15 PM, Matthew Rosato wrote:
>>> Fix some sparse warnings that a plain integer 0 is being used instead of
>>> NULL.
>>>
>>> Reported-by: kernel test robot <lkp@...el.com>
>>> Signed-off-by: Matthew Rosato <mjrosato@...ux.ibm.com>
>>
>> @Janosch, since you are taking the other PCI fix can you also take this small cleanup through KVM?
> 
> Queued now for the kvm tree. Will have to look if we have other things for 6.0. Otherwise it will go with 6.1.

Hmmm, checkpatch --strict has this:

CHECK: Comparison to NULL could be written "!aift->kzdev"
#52: FILE: arch/s390/kvm/pci.h:49:
+	if (!IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM) || aift->kzdev == NULL ||

CHECK: Comparison to NULL could be written "!aift->kzdev[si]"
#53: FILE: arch/s390/kvm/pci.h:50:
+	    aift->kzdev[si] == NULL)

total: 0 errors, 0 warnings, 2 checks, 28 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
       mechanically convert to the typical style using --fix or --fix-inplace.


Can you maybe redo this so that we avoid followup patches?