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

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Date:   Thu, 15 Sep 2022 18:16:00 +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 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.

> 
>> ---
>>   arch/s390/kvm/pci.c | 4 ++--
>>   arch/s390/kvm/pci.h | 6 +++---
>>   2 files changed, 5 insertions(+), 5 deletions(-)
>>
>> diff --git a/arch/s390/kvm/pci.c b/arch/s390/kvm/pci.c
>> index bb8c335d17b9..3c12637ce08c 100644
>> --- a/arch/s390/kvm/pci.c
>> +++ b/arch/s390/kvm/pci.c
>> @@ -58,7 +58,7 @@ static int zpci_setup_aipb(u8 nisc)
>>   	if (!zpci_aipb)
>>   		return -ENOMEM;
>>   
>> -	aift->sbv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC, 0);
>> +	aift->sbv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC, NULL);
>>   	if (!aift->sbv) {
>>   		rc = -ENOMEM;
>>   		goto free_aipb;
>> @@ -373,7 +373,7 @@ static int kvm_s390_pci_aif_disable(struct zpci_dev *zdev, bool force)
>>   		gaite->gisc = 0;
>>   		gaite->aisbo = 0;
>>   		gaite->gisa = 0;
>> -		aift->kzdev[zdev->aisb] = 0;
>> +		aift->kzdev[zdev->aisb] = NULL;
>>   		/* Clear zdev info */
>>   		airq_iv_free_bit(aift->sbv, zdev->aisb);
>>   		airq_iv_release(zdev->aibv);
>> diff --git a/arch/s390/kvm/pci.h b/arch/s390/kvm/pci.h
>> index 3a3606c3a0fe..7be5568d8bd2 100644
>> --- a/arch/s390/kvm/pci.h
>> +++ b/arch/s390/kvm/pci.h
>> @@ -46,9 +46,9 @@ extern struct zpci_aift *aift;
>>   static inline struct kvm *kvm_s390_pci_si_to_kvm(struct zpci_aift *aift,
>>   						 unsigned long si)
>>   {
>> -	if (!IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM) || aift->kzdev == 0 ||
>> -	    aift->kzdev[si] == 0)
>> -		return 0;
>> +	if (!IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM) || aift->kzdev == NULL ||
>> +	    aift->kzdev[si] == NULL)
>> +		return NULL;
>>   	return aift->kzdev[si]->kvm;
>>   };
>>   
>