[POWERPC] Fix section mismatch in PCI code

Create a helper function (alloc_maybe_bootmem) that is marked __init_refok
to limit the chances of mistakenly referring to other __init routines.

WARNING: vmlinux.o(.text+0x2a9c4): Section mismatch: reference to .init.text:.__alloc_bootmem (between '.update_dn_pci_info' and '.pci_dn_reconfig_notifier')
WARNING: vmlinux.o(.text+0x36430): Section mismatch: reference to .init.text:.__alloc_bootmem (between '.mpic_msi_init_allocator' and '.find_ht_magic_addr')
WARNING: vmlinux.o(.text+0x5e804): Section mismatch: reference to .init.text:.__alloc_bootmem (between '.celleb_setup_phb' and '.celleb_fake_pci_write_config')
WARNING: vmlinux.o(.text+0x5e8e8): Section mismatch: reference to .init.text:.__alloc_bootmem (between '.celleb_setup_phb' and '.celleb_fake_pci_write_config')
WARNING: vmlinux.o(.text+0x5e968): Section mismatch: reference to .init.text:.__alloc_bootmem (between '.celleb_setup_phb' and '.celleb_fake_pci_write_config')

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/kernel/pci_dn.c b/arch/powerpc/kernel/pci_dn.c
index d7d36df..b483903 100644
--- a/arch/powerpc/kernel/pci_dn.c
+++ b/arch/powerpc/kernel/pci_dn.c
@@ -23,8 +23,6 @@
 #include <linux/pci.h>
 #include <linux/string.h>
 #include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/bootmem.h>
 
 #include <asm/io.h>
 #include <asm/prom.h>
@@ -45,10 +43,7 @@
 	const u32 *regs;
 	struct pci_dn *pdn;
 
-	if (mem_init_done)
-		pdn = kmalloc(sizeof(*pdn), GFP_KERNEL);
-	else
-		pdn = alloc_bootmem(sizeof(*pdn));
+	pdn = alloc_maybe_bootmem(sizeof(*pdn), GFP_KERNEL);
 	if (pdn == NULL)
 		return NULL;
 	memset(pdn, 0, sizeof(*pdn));