[xen staging] lib: move memcmp()

[patchbot@xxxxxxx]

commit 880d89fbfe7ea4229f58d87ad5959acca41d5d12
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu Apr 22 14:45:06 2021 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Apr 22 14:45:06 2021 +0200

    lib: move memcmp()
    
    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 | 19 -------------------
 xen/lib/Makefile    |  1 +
 xen/lib/memcmp.c    | 32 ++++++++++++++++++++++++++++++++
 3 files changed, 33 insertions(+), 19 deletions(-)

diff --git a/xen/common/string.c b/xen/common/string.c
index 4171d67f04..f40b65f630 100644
--- a/xen/common/string.c
+++ b/xen/common/string.c
@@ -311,25 +311,6 @@ char *(strstr)(const char *s1, const char *s2)
 }
 #endif
 
-#ifndef __HAVE_ARCH_MEMCMP
-/**
- * memcmp - Compare two areas of memory
- * @cs: One area of memory
- * @ct: Another area of memory
- * @count: The size of the area.
- */
-int (memcmp)(const void *cs, const void *ct, size_t count)
-{
-       const unsigned char *su1, *su2;
-       int res = 0;
-
-       for( su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
-               if ((res = *su1 - *su2) != 0)
-                       break;
-       return res;
-}
-#endif
-
 #ifndef __HAVE_ARCH_MEMCHR
 /**
  * memchr - Find a character in an area of memory.
diff --git a/xen/lib/Makefile b/xen/lib/Makefile
index abb78b956f..2667bb2d53 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 += memcmp.o
 lib-y += memcpy.o
 lib-y += memmove.o
 lib-y += memset.o
diff --git a/xen/lib/memcmp.c b/xen/lib/memcmp.c
new file mode 100644
index 0000000000..df0e9be8c5
--- /dev/null
+++ b/xen/lib/memcmp.c
@@ -0,0 +1,32 @@
+/*
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+#include <xen/string.h>
+
+/**
+ * memcmp - Compare two areas of memory
+ * @cs: One area of memory
+ * @ct: Another area of memory
+ * @count: The size of the area.
+ */
+int (memcmp)(const void *cs, const void *ct, size_t count)
+{
+       const unsigned char *su1, *su2;
+       int res = 0;
+
+       for( su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
+               if ((res = *su1 - *su2) != 0)
+                       break;
+       return res;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 8
+ * tab-width: 8
+ * indent-tabs-mode: t
+ * End:
+ */
--
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