[xen staging] lib: move memset()

[patchbot@xxxxxxx]

commit 8bd9c8d50315d5f3eb146c889ce629e5fcb18efa
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu Apr 22 14:42:31 2021 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Apr 22 14:42:31 2021 +0200

    lib: move memset()
    
    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          | 20 --------------------
 xen/include/asm-x86/string.h |  3 ---
 xen/lib/Makefile             |  1 +
 xen/lib/memset.c             | 33 +++++++++++++++++++++++++++++++++
 4 files changed, 34 insertions(+), 23 deletions(-)

diff --git a/xen/common/string.c b/xen/common/string.c
index af3d96ad0f..3c83736d6b 100644
--- a/xen/common/string.c
+++ b/xen/common/string.c
@@ -311,26 +311,6 @@ char *(strstr)(const char *s1, const char *s2)
 }
 #endif
 
-#ifndef __HAVE_ARCH_MEMSET
-/**
- * memset - Fill a region of memory with the given value
- * @s: Pointer to the start of the area.
- * @c: The byte to fill the area with
- * @count: The size of the area.
- *
- * Do not use memset() to access IO space, use memset_io() instead.
- */
-void *(memset)(void *s, int c, size_t count)
-{
-       char *xs = (char *) s;
-
-       while (count--)
-               *xs++ = c;
-
-       return s;
-}
-#endif
-
 #ifndef __HAVE_ARCH_MEMCPY
 /**
  * memcpy - Copy one area of memory to another
diff --git a/xen/include/asm-x86/string.h b/xen/include/asm-x86/string.h
index 4f1e1d4daf..3102d91f13 100644
--- a/xen/include/asm-x86/string.h
+++ b/xen/include/asm-x86/string.h
@@ -7,9 +7,6 @@
 #define __HAVE_ARCH_MEMMOVE
 #define memmove(d, s, n) __builtin_memmove(d, s, n)
 
-#define __HAVE_ARCH_MEMSET
-#define memset(s, c, n) __builtin_memset(s, c, n)
-
 #endif /* __X86_STRING_H__ */
 /*
  * Local variables:
diff --git a/xen/lib/Makefile b/xen/lib/Makefile
index a5dc1442a4..98e5747ca7 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 += memset.o
 lib-y += muldiv64.o
 lib-y += parse-size.o
 lib-y += rbtree.o
diff --git a/xen/lib/memset.c b/xen/lib/memset.c
new file mode 100644
index 0000000000..e86afafd02
--- /dev/null
+++ b/xen/lib/memset.c
@@ -0,0 +1,33 @@
+/*
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+#include <xen/string.h>
+
+/**
+ * memset - Fill a region of memory with the given value
+ * @s: Pointer to the start of the area.
+ * @c: The byte to fill the area with
+ * @count: The size of the area.
+ *
+ * Do not use memset() to access IO space, use memset_io() instead.
+ */
+void *(memset)(void *s, int c, size_t count)
+{
+       char *xs = (char *) s;
+
+       while (count--)
+               *xs++ = c;
+
+       return 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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