[tip: x86/cleanups] x86/pat: Do not compile stubbed functions when X86_PAT is off

[tip-bot2 for Jan Kiszka]

The following commit has been merged into the x86/cleanups branch of tip:

Commit-ID:     16854b567dff767e5ec5e6dc23021271136733a5
Gitweb:        https://git.kernel.org/tip/16854b567dff767e5ec5e6dc23021271136733a5
Author:        Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
AuthorDate:    Mon, 26 Oct 2020 18:39:06 +01:00
Committer:     Borislav Petkov <bp@xxxxxxx>
CommitterDate: Wed, 14 Apr 2021 08:21:41 +02:00

x86/pat: Do not compile stubbed functions when X86_PAT is off

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

The conflict remains invisible until someone would pull linux/io.h into
memtype.c. This fixes a build error when this file is used outside of
the kernel tree.

  [ bp: Massage commit message. ]

Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Link: https://lkml.kernel.org/r/a9351615-7a0d-9d47-af65-d9e2fffe8192@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 6084d14..3112ca7 100644
--- a/arch/x86/mm/pat/memtype.c
+++ b/arch/x86/mm/pat/memtype.c
@@ -800,6 +800,7 @@ 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;
@@ -813,6 +814,7 @@ 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)