[xen staging] lib: move memcpy()

[patchbot@xxxxxxx]

commit 54febb419b1749535bf2f462e9a3eb3086e35d0a
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu Apr 22 14:44:35 2021 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Apr 22 14:44:35 2021 +0200

    lib: move memcpy()
    
    By moving the function into an archive, x86 doesn't need to announce
    anymore that is has its own implementation - symbol resolution by the
    linker will now guarantee that the generic function remains unused, and
    the forwarding to the compiler built-in gets done by the common header
    anyway.
    
    Allow the function to be individually linkable, discardable, and
    overridable.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 xen/common/string.c          | 21 ---------------------
 xen/include/asm-x86/string.h |  3 ---
 xen/lib/Makefile             |  1 +
 xen/lib/memcpy.c             | 34 ++++++++++++++++++++++++++++++++++
 4 files changed, 35 insertions(+), 24 deletions(-)

diff --git a/xen/common/string.c b/xen/common/string.c
index 3c83736d6b..3989cd8f3d 100644
--- a/xen/common/string.c
+++ b/xen/common/string.c
@@ -311,27 +311,6 @@ char *(strstr)(const char *s1, const char *s2)
 }
 #endif
 
-#ifndef __HAVE_ARCH_MEMCPY
-/**
- * memcpy - Copy one area of memory to another
- * @dest: Where to copy to
- * @src: Where to copy from
- * @count: The size of the area.
- *
- * You should not use this function to access IO space, use memcpy_toio()
- * or memcpy_fromio() instead.
- */
-void *(memcpy)(void *dest, const void *src, size_t count)
-{
-       char *tmp = (char *) dest, *s = (char *) src;
-
-       while (count--)
-               *tmp++ = *s++;
-
-       return dest;
-}
-#endif
-
 #ifndef __HAVE_ARCH_MEMMOVE
 /**
  * memmove - Copy one area of memory to another
diff --git a/xen/include/asm-x86/string.h b/xen/include/asm-x86/string.h
index 3102d91f13..b45e48ce33 100644
--- a/xen/include/asm-x86/string.h
+++ b/xen/include/asm-x86/string.h
@@ -1,9 +1,6 @@
 #ifndef __X86_STRING_H__
 #define __X86_STRING_H__
 
-#define __HAVE_ARCH_MEMCPY
-#define memcpy(d, s, n) __builtin_memcpy(d, s, n)
-
 #define __HAVE_ARCH_MEMMOVE
 #define memmove(d, s, n) __builtin_memmove(d, s, n)
 
diff --git a/xen/lib/Makefile b/xen/lib/Makefile
index 98e5747ca7..7116de61b2 100644
--- a/xen/lib/Makefile
+++ b/xen/lib/Makefile
@@ -4,6 +4,7 @@ lib-y += bsearch.o
 lib-y += ctors.o
 lib-y += ctype.o
 lib-y += list-sort.o
+lib-y += memcpy.o
 lib-y += memset.o
 lib-y += muldiv64.o
 lib-y += parse-size.o
diff --git a/xen/lib/memcpy.c b/xen/lib/memcpy.c
new file mode 100644
index 0000000000..afb322797d
--- /dev/null
+++ b/xen/lib/memcpy.c
@@ -0,0 +1,34 @@
+/*
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+#include <xen/string.h>
+
+/**
+ * memcpy - Copy one area of memory to another
+ * @dest: Where to copy to
+ * @src: Where to copy from
+ * @count: The size of the area.
+ *
+ * You should not use this function to access IO space, use memcpy_toio()
+ * or memcpy_fromio() instead.
+ */
+void *(memcpy)(void *dest, const void *src, size_t count)
+{
+       char *tmp = (char *) dest, *s = (char *) src;
+
+       while (count--)
+               *tmp++ = *s++;
+
+       return dest;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 8
+ * tab-width: 8
+ * indent-tabs-mode: t
+ * End:
+ */
--
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