Re: [PATCH v2 04/10] PCI/P2PDMA: Clear ACS P2P flags for all devices behind switches

Logan Gunthorpe
2018-03-01T19:13:10Z

On 01/03/18 11:02 AM, Bjorn Helgaas wrote:
>> void pci_enable_acs(struct pci_dev *dev)
>> {
>> + if (pci_p2pdma_disable_acs(dev))
>> + return;
>
> This doesn't read naturally to me. I do see that when
> CONFIG_PCI_P2PDMA is not set, pci_p2pdma_disable_acs() does nothing
> and returns 0, so we'll go ahead and try to enable ACS as before.
>
> But I think it would be clearer to have an #ifdef CONFIG_PCI_P2PDMA
> right here so it's more obvious that we only disable ACS when it's
> selected.

I could do this... however, I wrote it this way because I've read Linus
dislikes using #ifdef's inside function bodies and I personally agree
with that sentiment.

Logan