On Mon, Jan 20, 2025 at 01:00:15PM +0100, Niklas Cassel wrote:
> Hello Bjorn,
>
> On Sat, Jan 18, 2025 at 02:34:21PM -0600, Bjorn Helgaas wrote:
> > On Tue, Dec 03, 2024 at 07:38:53AM +0100, Niklas Cassel wrote:
> > > The test BAR is on the EP side is allocated using pci_epf_alloc_space(),
> > > which allocates the backing memory using dma_alloc_coherent(), which will
> > > return zeroed memory regardless of __GFP_ZERO was set or not.
> >
> > > +static void pci_epf_test_set_capabilities(struct pci_epf *epf)
> > > +{
> > > + struct pci_epf_test *epf_test = epf_get_drvdata(epf);
> > > + enum pci_barno test_reg_bar = epf_test->test_reg_bar;
> > > + struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar];
> > > + struct pci_epc *epc = epf->epc;
> > > + u32 caps = 0;
> > > +
> > > + if (epc->ops->align_addr)
> > > + caps |= CAP_UNALIGNED_ACCESS;
> > > +
> > > + reg->caps = cpu_to_le32(caps);
> >
> > "make C=2 drivers/pci/" complains about this:
> >
> > drivers/pci/endpoint/functions/pci-epf-test.c:756:19: warning: incorrect type in assignment (different base types)
> > drivers/pci/endpoint/functions/pci-epf-test.c:756:19: expected unsigned int [usertype] caps
> > drivers/pci/endpoint/functions/pci-epf-test.c:756:19: got restricted __le32 [usertype]
>
> Yes, pci-epf-test is broken when it comes to endianness, as reported here:
> https://lore.kernel.org/linux-pci/ZxYHoi4mv-4eg0TK@xxxxxxxxx/
>
>
> Nice to see that sparse is complaining about it! :)
>
> Mani said that he was going to work on it, but I guess that it fell through
> the cracks.
>
It doesn't but I put it in the back burner due to other high priority issues to
fix.
> I sent patch for it here:
> https://lore.kernel.org/linux-pci/20250120115009.2748899-2-cassel@xxxxxxxxxx/T/#u
>
Thanks a lot!
- Mani
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