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PCI: Add dummy pci_acs_enabled() for CONFIG_PCI=n build 

If CONFIG_PCI=n and gcc (e.g. 4.1.2) decides not to inline
get_pci_function_alias_group(), the build fails with:

  drivers/iommu/iommu.o: In function `get_pci_function_alias_group':
  iommu.c:(.text+0xfdc): undefined reference to `pci_acs_enabled'

Due to the various dummies for PCI calls in the CONFIG_PCI=n case,
pci_acs_enabled() never called, but not all versions of gcc are smart
enough to realize that.

While explicitly marking get_pci_function_alias_group() inline would fix
the build, this would inflate the code for the CONFIG_PCI=y case, as
get_pci_function_alias_group() is a not-so-small function called from two
places.

Hence fix the issue by introducing a dummy for pci_acs_enabled() instead.

Fixes: 0ae349a0f3 ("iommu/qcom: Add qcom_iommu")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Geert Uytterhoeven 2017-09-11 14:29:15 +02:00 committed by Bjorn Helgaas
parent 749aaf3372
commit fe59493240
1 changed files with 2 additions and 0 deletions
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2
include/linux/pci.h
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@ -1685,6 +1685,8 @@ static inline int pci_get_new_domain_nr(void) { return -ENOSYS; }
#define dev_is_pci(d) (false)
#define dev_is_pf(d) (false)
static inline bool pci_acs_enabled(struct pci_dev *pdev, u16 acs_flags)
{ return false; }
#endif /* CONFIG_PCI */
/* Include architecture-dependent settings and functions */