From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Bjorn Helgaas <bhelgaas@google.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
Alex Williamson <alex.williamson@redhat.com>,
Joerg Roedel <jroedel@suse.de>,
linux-pci@vger.kernel.org, iommu@lists.linux-foundation.org,
linux-kernel@vger.kernel.org,
Geert Uytterhoeven <geert@linux-m68k.org>
Subject: [PATCH] pci: Add dummy for pci_acs_enabled() if CONFIG_PCI=n to fix iommmu build
Date: Mon, 11 Sep 2017 14:29:15 +0200 [thread overview]
Message-ID: <1505132955-9517-1-git-send-email-geert@linux-m68k.org> (raw)
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() isn't actually ever 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.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
---
include/linux/pci.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/include/linux/pci.h b/include/linux/pci.h
index f68c58a93dd045b9..f4f8ee5a7362e982 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -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 */
--
2.7.4
next reply other threads:[~2017-09-11 12:29 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-11 12:29 Geert Uytterhoeven [this message]
2017-09-20 12:12 ` [PATCH] pci: Add dummy for pci_acs_enabled() if CONFIG_PCI=n to fix iommmu build Joerg Roedel
2017-09-20 16:14 ` Alex Williamson
2017-09-22 15:56 ` Bjorn Helgaas
2017-09-22 17:51 ` Joerg Roedel
2017-09-22 18:12 ` Geert Uytterhoeven
2017-09-25 16:13 ` Bjorn Helgaas
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