[xen staging] lib: move strlen()

[patchbot@xxxxxxx]

commit 9d0c024c2fa9f5e0224edf26febf27feaa757827
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu Apr 22 14:48:01 2021 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Apr 22 14:48:01 2021 +0200

    lib: move strlen()
    
    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 | 15 ---------------
 xen/lib/Makefile    |  1 +
 xen/lib/strlen.c    | 28 ++++++++++++++++++++++++++++
 3 files changed, 29 insertions(+), 15 deletions(-)

diff --git a/xen/common/string.c b/xen/common/string.c
index eae5e2a314..752f65954c 100644
--- a/xen/common/string.c
+++ b/xen/common/string.c
@@ -184,21 +184,6 @@ char *(strrchr)(const char *s, int c)
 }
 #endif
 
-#ifndef __HAVE_ARCH_STRLEN
-/**
- * strlen - Find the length of a string
- * @s: The string to be sized
- */
-size_t (strlen)(const char * s)
-{
-       const char *sc;
-
-       for (sc = s; *sc != '\0'; ++sc)
-               /* nothing */;
-       return sc - s;
-}
-#endif
-
 #ifndef __HAVE_ARCH_STRNLEN
 /**
  * strnlen - Find the length of a length-limited string
diff --git a/xen/lib/Makefile b/xen/lib/Makefile
index ce61fbe3cd..25c6ec62b1 100644
--- a/xen/lib/Makefile
+++ b/xen/lib/Makefile
@@ -14,6 +14,7 @@ lib-y += muldiv64.o
 lib-y += parse-size.o
 lib-y += rbtree.o
 lib-y += sort.o
+lib-y += strlen.o
 lib-$(CONFIG_X86) += xxhash32.o
 lib-$(CONFIG_X86) += xxhash64.o
 
diff --git a/xen/lib/strlen.c b/xen/lib/strlen.c
new file mode 100644
index 0000000000..96f9bea43d
--- /dev/null
+++ b/xen/lib/strlen.c
@@ -0,0 +1,28 @@
+/*
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+#include <xen/string.h>
+
+/**
+ * strlen - Find the length of a string
+ * @s: The string to be sized
+ */
+size_t (strlen)(const char * s)
+{
+       const char *sc;
+
+       for (sc = s; *sc != '\0'; ++sc)
+               /* nothing */;
+       return sc - s;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 8
+ * tab-width: 8
+ * indent-tabs-mode: t
+ * End:
+ */
--
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