vga_set_legacy_decoding() is defined in drivers/gpu/vga/vgaarb.c,
which is only compiled with CONFIG_VGA_ARB. A caller would
therefore get an undefined symbol if the VGA arbiter is not
enabled.
Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
---
I'd like to use this function from vfio-pci to opt-out VGA devices
from arbitration if vfio-pci VGA support is disabled. This helps to
keep DRI2 enabled on the host if additional GPUs are installed for
VMs and used without VGA support. I can pull this change in through
my tree if someone wants to provide just an ack. Thanks!
include/linux/vgaarb.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/include/linux/vgaarb.h b/include/linux/vgaarb.h
index c37bd4d..8c3b412 100644
--- a/include/linux/vgaarb.h
+++ b/include/linux/vgaarb.h
@@ -65,8 +65,13 @@ struct pci_dev;
* out of the arbitration process (and can be safe to take
* interrupts at any time.
*/
+#if defined(CONFIG_VGA_ARB)
extern void vga_set_legacy_decoding(struct pci_dev *pdev,
unsigned int decodes);
+#else
+static inline void vga_set_legacy_decoding(struct pci_dev *pdev,
+ unsigned int decodes) { };
+#endif
/**
* vga_get - acquire & locks VGA resources
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