Re: linux-next: build failure after merge of the iommu tree

[Bjorn Helgaas]

On Tue, Oct 12, 2021 at 12:21:58PM +0100, Lorenzo Pieralisi wrote:
> On Tue, Oct 12, 2021 at 09:33:48AM +0100, Marc Zyngier wrote:
> > [+ Sven]
> > 
> > On Tue, 12 Oct 2021 04:46:39 +0100,
> > Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote:
> > > 
> > > Hi all,
> > > 
> > > After merging the iommu tree, today's linux-next build (x86_64
> > > allmodconfig) failed like this:
> > > 
> > > drivers/iommu/apple-dart.c: In function 'apple_dart_get_resv_regions':
> > > drivers/iommu/apple-dart.c:758:2: error: implicit declaration of function 'iommu_dma_get_resv_regions'; did you mean 'iommu_get_resv_regions'? [-Werror=implicit-function-declaration]
> > >   758 |  iommu_dma_get_resv_regions(dev, head);
> > >       |  ^~~~~~~~~~~~~~~~~~~~~~~~~~
> > >       |  iommu_get_resv_regions
> > > cc1: all warnings being treated as errors
> > > 
> > > Caused by commit
> > > 
> > >   b2b2781a9755 ("iommu/dart: Clean up IOVA cookie crumbs")
> > > 
> > > interactig with commit
> > > 
> > >   05dc551614a4 ("iommu/dart: Exclude MSI doorbell from PCIe device IOVA range")
> > > 
> > > from the pci tree.
> > > 
> > > I have applied the following merge fix patch.
> > > 
> > > From: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
> > > Date: Tue, 12 Oct 2021 14:40:49 +1100
> > > Subject: [PATCH] fix for "iommu/dart: Exclude MSI doorbell from PCIe device
> > >  IOVA range"
> > > 
> > > Signed-off-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
> > > ---
> > >  drivers/iommu/apple-dart.c | 1 +
> > >  1 file changed, 1 insertion(+)
> > > 
> > > diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c
> > > index 912be9b7669c..280ff8df728d 100644
> > > --- a/drivers/iommu/apple-dart.c
> > > +++ b/drivers/iommu/apple-dart.c
> > > @@ -15,6 +15,7 @@
> > >  #include <linux/bitfield.h>
> > >  #include <linux/clk.h>
> > >  #include <linux/dev_printk.h>
> > > +#include <linux/dma-iommu.h>
> > >  #include <linux/dma-mapping.h>
> > >  #include <linux/err.h>
> > >  #include <linux/interrupt.h>
> > 
> > Thanks for fixing this. Lorenzo, do you mind slapping this on top of
> > the Apple PCIe series?
> 
> I think this will have to be done by Bjorn at PR time, depending on
> IOMMU<->PCI trees PRs timing, please correct me if I am wrong, we
> have to reintroduce the line above since it is deleted by:
> 
> b2b2781a9755 ("iommu/dart: Clean up IOVA cookie crumbs")
> 
> in the IOMMU tree.

Sure, no problem.  I made a note to check for this when I send the
pull request and fix it up or mention it to Joerg and/or Linus as
necessary.

Thanks for the heads-up!

Bjorn