[PATCH] x86: pat: Do not compile stubbed functions when X86_PAT is off

[Jan Kiszka]

From: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>

Those are already provided by linux/io.h as stubs.

The conflict remains invisible until someone would pull {linux,asm}/io.h
into memtype.c.

Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
---
 arch/x86/mm/pat/memtype.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/mm/pat/memtype.c b/arch/x86/mm/pat/memtype.c
index 394be8611748..a695e17bd4c7 100644
--- a/arch/x86/mm/pat/memtype.c
+++ b/arch/x86/mm/pat/memtype.c
@@ -801,6 +801,7 @@ void memtype_free_io(resource_size_t start, resource_size_t end)
 	memtype_free(start, end);
 }
 
+#ifdef CONFIG_X86_PAT
 int arch_io_reserve_memtype_wc(resource_size_t start, resource_size_t size)
 {
 	enum page_cache_mode type = _PAGE_CACHE_MODE_WC;
@@ -814,6 +815,7 @@ void arch_io_free_memtype_wc(resource_size_t start, resource_size_t size)
 	memtype_free_io(start, start + size);
 }
 EXPORT_SYMBOL(arch_io_free_memtype_wc);
+#endif
 
 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 				unsigned long size, pgprot_t vma_prot)
-- 
2.16.4