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Message-ID: <e0754578-1735-5811-0533-19ef0c6be2b0@linux.ibm.com>
Date:   Mon, 26 Sep 2022 11:17:34 +0200
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Subject: Re: [PATCH v2 2/3] s390/pci: remove unused bus_next field from struct
 zpci_dev
To:     Niklas Schnelle <schnelle@linux.ibm.com>,
        Matthew Rosato <mjrosato@linux.ibm.com>, iommu@lists.linux.dev
Cc:     linux-s390@vger.kernel.org, borntraeger@linux.ibm.com,
        hca@linux.ibm.com, gor@linux.ibm.com,
        gerald.schaefer@linux.ibm.com, agordeev@linux.ibm.com,
        svens@linux.ibm.com, joro@8bytes.org, will@kernel.org,
        robin.murphy@arm.com, jgg@nvidia.com, linux-kernel@vger.kernel.org
References: <20220922095239.2115309-1-schnelle@linux.ibm.com>
 <20220922095239.2115309-3-schnelle@linux.ibm.com>
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From:   Pierre Morel <pmorel@linux.ibm.com>
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On 9/22/22 11:52, Niklas Schnelle wrote:
> This field was added in commit 44510d6fa0c0 ("s390/pci: Handling
> multifunctions") but is an unused remnant of an earlier version where
> the devices on the virtual bus were connected in a linked list instead
> of a fixed 256 entry array of pointers.
> 
> It is also not used for the list of busses as that is threaded through
> struct zpci_bus not through struct zpci_dev.
> 
> Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>

Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>


> ---
>   arch/s390/include/asm/pci.h | 1 -
>   1 file changed, 1 deletion(-)
> 
> diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h
> index 7b4cdadbc023..108e732d7b14 100644
> --- a/arch/s390/include/asm/pci.h
> +++ b/arch/s390/include/asm/pci.h
> @@ -117,7 +117,6 @@ struct zpci_bus {
>   struct zpci_dev {
>   	struct zpci_bus *zbus;
>   	struct list_head entry;		/* list of all zpci_devices, needed for hotplug, etc. */
> -	struct list_head bus_next;
>   	struct kref kref;
>   	struct hotplug_slot hotplug_slot;
>   

-- 
Pierre Morel
IBM Lab Boeblingen