umount: make umount2 depend on UCLIBC_LINUX_SPECIFIC

Add hidden umount2 to be used in umount eventually.
Rework umount to either use directly umount2 syscall or function.

docs say, that mount and umount are also Linux specific

Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

include/sys/mount.h

@@ -115,8 +115,11 @@ extern int mount (__const char *__special_file, __const char *__dir,
 /* Unmount a filesystem.  */
 extern int umount (__const char *__special_file) __THROW;
 
+#ifdef __UCLIBC_LINUX_SPECIFIC__
 /* Unmount a filesystem.  Force unmounting if FLAGS is set to MNT_FORCE.  */
 extern int umount2 (__const char *__special_file, int __flags) __THROW;
+libc_hidden_proto(umount2)
+#endif
 
 __END_DECLS
 

libc/sysdeps/linux/common/umount.c

@@ -9,24 +9,15 @@
 
 #include <sys/syscall.h>
 
-#if defined __USE_GNU
 #include <sys/mount.h>
-
-/* arch provides umount() syscall */
 #ifdef __NR_umount
-
 _syscall1(int, umount, const char *, specialfile)
-
-/* arch provides umount2() syscall */
 #elif defined __NR_umount2
-
-# define __NR___syscall_umount2 __NR_umount2
-static __inline__ _syscall2(int, __syscall_umount2, const char *, special_file, int, flags)
-
+# ifndef  __UCLIBC_LINUX_SPECIFIC__
+static __always_inline _syscall2(int, umount2, const char *, special_file, int, flags)
+# endif
 int umount(const char *special_file)
 {
-	return (__syscall_umount2(special_file, 0));
+	return umount2(special_file, 0);
 }
-
-#endif
 #endif

libc/sysdeps/linux/common/umount2.c

@@ -9,9 +9,8 @@
 
 #include <sys/syscall.h>
 
-#if defined __USE_GNU
-#include <sys/mount.h>
-#ifdef __NR_umount2	/* Old kernels don't have umount2 */
+#if defined __UCLIBC_LINUX_SPECIFIC__ && defined __NR_umount2
+# include <sys/mount.h>
 _syscall2(int, umount2, const char *, special_file, int, flags)
-#endif
+libc_hidden_def(umount2)
 #endif