diff --git a/arch/powerpc/include/asm/pci.h b/arch/powerpc/include/asm/pci.h
index 289f1ec85bc54..f5078a7dd85a5 100644
--- a/arch/powerpc/include/asm/pci.h
+++ b/arch/powerpc/include/asm/pci.h
@@ -82,7 +82,8 @@ extern int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val,
 extern int pci_mmap_legacy_page_range(struct pci_bus *bus,
 				      struct vm_area_struct *vma,
 				      enum pci_mmap_state mmap_state);
-
+extern void pci_adjust_legacy_attr(struct pci_bus *bus,
+				   enum pci_mmap_state mmap_type);
 #define HAVE_PCI_LEGACY	1
 
 extern void pcibios_claim_one_bus(struct pci_bus *b);
diff --git a/arch/powerpc/kernel/audit.c b/arch/powerpc/kernel/audit.c
index 1bcfca5fdf676..92298d6a3a37a 100644
--- a/arch/powerpc/kernel/audit.c
+++ b/arch/powerpc/kernel/audit.c
@@ -4,6 +4,8 @@
 #include <linux/audit.h>
 #include <asm/unistd.h>
 
+#include "audit_32.h"
+
 static unsigned dir_class[] = {
 #include <asm-generic/audit_dir_write.h>
 ~0U
@@ -41,7 +43,6 @@ int audit_classify_arch(int arch)
 int audit_classify_syscall(int abi, unsigned syscall)
 {
 #ifdef CONFIG_PPC64
-	extern int ppc32_classify_syscall(unsigned);
 	if (abi == AUDIT_ARCH_PPC)
 		return ppc32_classify_syscall(syscall);
 #endif
diff --git a/arch/powerpc/kernel/audit_32.h b/arch/powerpc/kernel/audit_32.h
new file mode 100644
index 0000000000000..c6c79c3041ab2
--- /dev/null
+++ b/arch/powerpc/kernel/audit_32.h
@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0
+#ifndef __AUDIT_32_H__
+#define __AUDIT_32_H__
+
+extern int ppc32_classify_syscall(unsigned);
+
+#endif
diff --git a/arch/powerpc/kernel/compat_audit.c b/arch/powerpc/kernel/compat_audit.c
index d92ffe4e5dc1c..57b38c592b9f3 100644
--- a/arch/powerpc/kernel/compat_audit.c
+++ b/arch/powerpc/kernel/compat_audit.c
@@ -3,6 +3,8 @@
 #include <linux/audit_arch.h>
 #include <asm/unistd.h>
 
+#include "audit_32.h"
+
 unsigned ppc32_dir_class[] = {
 #include <asm-generic/audit_dir_write.h>
 ~0U
diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c
index 75b938268b040..0558202103171 100644
--- a/arch/powerpc/mm/book3s64/pgtable.c
+++ b/arch/powerpc/mm/book3s64/pgtable.c
@@ -9,6 +9,7 @@
 #include <linux/memremap.h>
 #include <linux/pkeys.h>
 #include <linux/debugfs.h>
+#include <linux/proc_fs.h>
 #include <misc/cxl-base.h>
 
 #include <asm/pgalloc.h>
diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c
index 6db7a063ba63f..7241b8515f89b 100644
--- a/arch/powerpc/mm/init_64.c
+++ b/arch/powerpc/mm/init_64.c
@@ -315,7 +315,7 @@ static unsigned long vmemmap_list_free(unsigned long start)
 	return vmem_back->phys;
 }
 
-void __ref __vmemmap_free(unsigned long start, unsigned long end,
+static void __ref __vmemmap_free(unsigned long start, unsigned long end,
 			  struct vmem_altmap *altmap)
 {
 	unsigned long page_size = 1 << mmu_psize_defs[mmu_vmemmap_psize].shift;
diff --git a/arch/powerpc/platforms/86xx/pic.c b/arch/powerpc/platforms/86xx/pic.c
index 2c32c3488afbb..7cdb16dc8b936 100644
--- a/arch/powerpc/platforms/86xx/pic.c
+++ b/arch/powerpc/platforms/86xx/pic.c
@@ -12,6 +12,8 @@
 #include <asm/mpic.h>
 #include <asm/i8259.h>
 
+#include "mpc86xx.h"
+
 #ifdef CONFIG_PPC_I8259
 static void mpc86xx_8259_cascade(struct irq_desc *desc)
 {
diff --git a/arch/powerpc/platforms/cell/ras.c b/arch/powerpc/platforms/cell/ras.c
index 98db63b72d56b..f6b87926530cc 100644
--- a/arch/powerpc/platforms/cell/ras.c
+++ b/arch/powerpc/platforms/cell/ras.c
@@ -22,7 +22,7 @@
 #include <asm/cell-regs.h>
 
 #include "ras.h"
-
+#include "pervasive.h"
 
 static void dump_fir(int cpu)
 {
diff --git a/arch/powerpc/platforms/cell/spu_manage.c b/arch/powerpc/platforms/cell/spu_manage.c
index 74567b32c48c2..f464a1f2e5681 100644
--- a/arch/powerpc/platforms/cell/spu_manage.c
+++ b/arch/powerpc/platforms/cell/spu_manage.c
@@ -25,6 +25,7 @@
 
 #include "spufs/spufs.h"
 #include "interrupt.h"
+#include "spu_priv1_mmio.h"
 
 struct device_node *spu_devnode(struct spu *spu)
 {
diff --git a/arch/powerpc/platforms/pasemi/pasemi.h b/arch/powerpc/platforms/pasemi/pasemi.h
index 3f277a200fd87..018c30665e1b3 100644
--- a/arch/powerpc/platforms/pasemi/pasemi.h
+++ b/arch/powerpc/platforms/pasemi/pasemi.h
@@ -4,6 +4,7 @@
 
 extern time64_t pas_get_boot_time(void);
 extern void pas_pci_init(void);
+struct pci_dev;
 extern void pas_pci_irq_fixup(struct pci_dev *dev);
 extern void pas_pci_dma_dev_setup(struct pci_dev *dev);
 
diff --git a/arch/powerpc/platforms/pasemi/time.c b/arch/powerpc/platforms/pasemi/time.c
index ad721882c8b6f..70ac6db027d0e 100644
--- a/arch/powerpc/platforms/pasemi/time.c
+++ b/arch/powerpc/platforms/pasemi/time.c
@@ -9,6 +9,8 @@
 
 #include <asm/time.h>
 
+#include "pasemi.h"
+
 time64_t __init pas_get_boot_time(void)
 {
 	/* Let's just return a fake date right now */
diff --git a/arch/powerpc/platforms/powermac/feature.c b/arch/powerpc/platforms/powermac/feature.c
index ed58928469b5b..ed472b797e28a 100644
--- a/arch/powerpc/platforms/powermac/feature.c
+++ b/arch/powerpc/platforms/powermac/feature.c
@@ -37,6 +37,8 @@
 #include <asm/pci-bridge.h>
 #include <asm/pmac_low_i2c.h>
 
+#include "pmac.h"
+
 #undef DEBUG_FEATURE
 
 #ifdef DEBUG_FEATURE
