x86, boot: Move memset() definition in compressed/string.c

Currently compressed/misc.c needs to link against memset(). I think one of
the reasons of this need is inclusion of various header files which define
static inline functions and use memset() inside these. For example,
include/linux/bitmap.h

I think trying to include "../string.h" and using builtin version of memset
does not work because by the time "#define memset" shows up, it is too
late. Some other header file has already used memset() and expects to
find a definition during link phase.

Currently we have a C definitoin of memset() in misc.c. Move it to
compressed/string.c so that others can use it if need be.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Link: http://lkml.kernel.org/r/1395170800-11059-6-git-send-email-vgoyal@redhat.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

1 files changed, 7 insertions, 13 deletions

diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index 3100092b1346..17684615374b 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -98,8 +98,14 @@
  */
 #define STATIC          static
 
-#undef memset
 #undef memcpy
+
+/*
+ * Use a normal definition of memset() from string.c. There are already
+ * included header files which expect a definition of memset() and by
+ * the time we define memset macro, it is too late.
+ */
+#undef memset
 #define memzero(s, n)   memset((s), 0, (n))
 
 
@@ -110,8 +116,6 @@ static void error(char *m);
  */
 struct boot_params *real_mode;          /* Pointer to real-mode data */
 
-void *memset(void *s, int c, size_t n);
-
 memptr free_mem_ptr;
 memptr free_mem_end_ptr;
 
@@ -216,16 +220,6 @@ void __putstr(const char *s)
         outb(0xff & (pos >> 1), vidport+1);
 }
 
-void *memset(void *s, int c, size_t n)
-{
-        int i;
-        char *ss = s;
-
-        for (i = 0; i < n; i++)
-                ss[i] = c;
-        return s;
-}
-
 static void error(char *x)
 {
         error_putstr("\n\n");