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[Xen-devel] [PATCH v3 3/3] x86/string: Clean up x86/string.h

 * None of the GCC docs mention memmove() in its list of builtins even today,
   but 4.1 does have the builtin, meaning that all currently supported
   compilers have it.
 * Consistently use Xen style, matching the common code, and introduce symbol
   definitions for function pointer use.

No functional change.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CC: Jan Beulich <JBeulich@xxxxxxxx>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=21602 confirms that the builtin
was present in 4.1.0

 * Rebase around the rework in the rest of the series
 xen/arch/x86/string.c        | 11 ++++-------
 xen/include/asm-x86/string.h | 18 ++++++++++++++----
 2 files changed, 18 insertions(+), 11 deletions(-)

diff --git a/xen/arch/x86/string.c b/xen/arch/x86/string.c
index 1387dfb..cd85a38 100644
--- a/xen/arch/x86/string.c
+++ b/xen/arch/x86/string.c
@@ -1,14 +1,13 @@
  * string.c
- * 
+ *
  * These provide something for compiler-emitted string operations to link
  * against.
 #include <xen/lib.h>
-#undef memcpy
-void *memcpy(void *dest, const void *src, size_t n)
+void *(memcpy)(void *dest, const void *src, size_t n)
     long d0, d1, d2;
@@ -23,8 +22,7 @@ void *memcpy(void *dest, const void *src, size_t n)
     return dest;
-#undef memset
-void *memset(void *s, int c, size_t n)
+void *(memset)(void *s, int c, size_t n)
     long d0, d1;
@@ -37,8 +35,7 @@ void *memset(void *s, int c, size_t n)
     return s;
-#undef memmove
-void *memmove(void *dest, const void *src, size_t n)
+void *(memmove)(void *dest, const void *src, size_t n)
     long d0, d1, d2;
diff --git a/xen/include/asm-x86/string.h b/xen/include/asm-x86/string.h
index c48d9c3..6f3c960 100644
--- a/xen/include/asm-x86/string.h
+++ b/xen/include/asm-x86/string.h
@@ -2,13 +2,23 @@
 #define __X86_STRING_H__
-#define memcpy(t,f,n) (__builtin_memcpy((t),(f),(n)))
+void *memcpy(void *dest, const void *src, size_t n);
+#define memcpy(d, s, n) __builtin_memcpy(d, s, n)
-/* Some versions of gcc don't have this builtin. It's non-critical anyway. */
-extern void *memmove(void *dest, const void *src, size_t n);
+void *memmove(void *dest, const void *src, size_t n);
+#define memmove(d, s, n) __builtin_memmove(d, s, n)
-#define memset(s,c,n) (__builtin_memset((s),(c),(n)))
+void *memset(void *dest, int c, size_t n);
+#define memset(s, c, n) __builtin_memset(s, c, n)
 #endif /* __X86_STRING_H__ */
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */

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