x86: Remove never-called arch_setup_msi_irq()

Since commit 75c46fa, "x64, x2apic/intr-remap: MSI and MSI-X
support for interrupt remapping infrastructure", x86 has had an
implementation of arch_setup_msi_irqs().

That implementation does not call arch_setup_msi_irq(), instead it calls
setup_irq(). No other x86 code calls arch_setup_msi_irq().

That leaves only arch_setup_msi_irqs() in drivers/pci/msi.c, but that
routine is overridden by the x86 version of arch_setup_msi_irqs().

So arch_setup_msi_irq() is dead code, remove it.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 0 insertions, 34 deletions

diff --git a/arch/x86/kernel/io_apic.c b/arch/x86/kernel/io_apic.c
index 79b8c0c72d34..157aafa45583 100644
--- a/arch/x86/kernel/io_apic.c
+++ b/arch/x86/kernel/io_apic.c
@@ -3462,40 +3462,6 @@ static int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int irq)
         return 0;
 }
 
-int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc)
-{
-        unsigned int irq;
-        int ret;
-        unsigned int irq_want;
-
-        irq_want = nr_irqs_gsi;
-        irq = create_irq_nr(irq_want);
-        if (irq == 0)
-                return -1;
-
-#ifdef CONFIG_INTR_REMAP
-        if (!intr_remapping_enabled)
-                goto no_ir;
-
-        ret = msi_alloc_irte(dev, irq, 1);
-        if (ret < 0)
-                goto error;
-no_ir:
-#endif
-        ret = setup_msi_irq(dev, msidesc, irq);
-        if (ret < 0) {
-                destroy_irq(irq);
-                return ret;
-        }
-        return 0;
-
-#ifdef CONFIG_INTR_REMAP
-error:
-        destroy_irq(irq);
-        return ret;
-#endif
-}
-
 int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 {
         unsigned int irq;