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init.c

#include <linux/pci.h>
#include <linux/init.h>
#include "pci.h"

/* arch_initcall has too random ordering, so call the initializers
   in the right sequence from here. */
static __init int pci_access_init(void)
{
      int type __maybe_unused = 0;

#ifdef CONFIG_PCI_DIRECT
      type = pci_direct_probe();
#endif
#ifdef CONFIG_PCI_MMCONFIG
      pci_mmcfg_init(type);
#endif
      if (raw_pci_ops)
            return 0;
#ifdef CONFIG_PCI_BIOS
      pci_pcbios_init();
#endif
      /*
       * don't check for raw_pci_ops here because we want pcbios as last
       * fallback, yet it's needed to run first to set pcibios_last_bus
       * in case legacy PCI probing is used. otherwise detecting peer busses
       * fails.
       */
#ifdef CONFIG_PCI_DIRECT
      pci_direct_init(type);
#endif
      if (!raw_pci_ops)
            printk(KERN_ERR
            "PCI: Fatal: No config space access function found\n");

      return 0;
}
arch_initcall(pci_access_init);

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