[PATCH] x86: fix build failure

[Andrey Ryabinin]

With KMEMCHECK=y, KASAN=n:

arch/x86/platform/efi/efi.c:673:3: error: implicit declaration of function âmemcpyâ [-Werror=implicit-function-declaration]
arch/x86/platform/efi/efi_64.c:139:2: error: implicit declaration of function âmemcpyâ [-Werror=implicit-function-declaration]
arch/x86/include/asm/desc.h:121:2: error: implicit declaration of function âmemcpyâ [-Werror=implicit-function-declaration]

Don't #undef memcpy if KASAN=n.

Reported-by: Ingo Molnar <mingo@xxxxxxxxxx>
Reported-by: Sedat Dilek <sedat.dilek@xxxxxxxxx>
Fixes: 769a8089c1fd ("x86, efi, kasan: #undef memset/memcpy/memmove per arch")
Signed-off-by: Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx>
---
 arch/x86/include/asm/efi.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
index ab5f1d4..ae68be9 100644
--- a/arch/x86/include/asm/efi.h
+++ b/arch/x86/include/asm/efi.h
@@ -86,6 +86,7 @@ extern u64 asmlinkage efi_call(void *fp, ...);
 extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size,
 					u32 type, u64 attribute);
 
+#ifdef CONFIG_KASAN
 /*
  * CONFIG_KASAN may redefine memset to __memset.  __memset function is present
  * only in kernel binary.  Since the EFI stub linked into a separate binary it
@@ -95,6 +96,7 @@ extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size,
 #undef memcpy
 #undef memset
 #undef memmove
+#endif
 
 #endif /* CONFIG_X86_32 */
 
-- 
2.4.6

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