fix the UML compilation

Based on patches from Linus' tree.
Signed-off-by: Adrian Bunk <bunk@stusta.de>

arch/um/os-Linux/process.c

@@ -11,6 +11,7 @@
 #include <linux/unistd.h>
 #include <sys/mman.h>
 #include <sys/wait.h>
+#include <sys/syscall.h>
 #include "ptrace_user.h"
 #include "os.h"
 #include "user.h"
@@ -139,11 +140,9 @@ void os_usr1_process(int pid)
  * syscalls, and also breaks with clone(), which does not unshare the TLS.
  */
 
-inline _syscall0(pid_t, getpid)
-
 int os_getpid(void)
 {
-	return(getpid());
+	return(syscall(__NR_getpid));
 }
 
 int os_getpgrp(void)

arch/um/os-Linux/skas/process.c

@@ -17,6 +17,7 @@
 #include <sys/time.h>
 #include <asm/unistd.h>
 #include <asm/types.h>
+#include <asm/page.h>
 #include "user.h"
 #include "sysdep/ptrace.h"
 #include "user_util.h"

arch/um/sys-i386/unmap.c

@@ -5,20 +5,17 @@
 
 #include <linux/mman.h>
 #include <asm/unistd.h>
+#include <sys/syscall.h>
 
-static int errno;
-
-static inline _syscall2(int,munmap,void *,start,size_t,len)
-static inline _syscall6(void *,mmap2,void *,addr,size_t,len,int,prot,int,flags,int,fd,off_t,offset)
 int switcheroo(int fd, int prot, void *from, void *to, int size)
 {
-	if(munmap(to, size) < 0){
+	if (syscall(__NR_munmap, to, size) < 0){
 		return(-1);
 	}
-	if(mmap2(to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) == (void*) -1 ){
+	if (syscall(__NR_mmap2, to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) == (void*) -1 ){
 		return(-1);
 	}
-	if(munmap(from, size) < 0){
+	if (syscall(__NR_munmap, from, size) < 0){
 		return(-1);
 	}
 	return(0);

arch/um/sys-x86_64/unmap.c

@@ -5,20 +5,17 @@
 
 #include <linux/mman.h>
 #include <asm/unistd.h>
+#include <sys/syscall.h>
 
-static int errno;
-
-static inline _syscall2(int,munmap,void *,start,size_t,len)
-static inline _syscall6(void *,mmap,void *,addr,size_t,len,int,prot,int,flags,int,fd,off_t,offset)
 int switcheroo(int fd, int prot, void *from, void *to, int size)
 {
-	if(munmap(to, size) < 0){
+	if (syscall(__NR_munmap, to, size) < 0){
 		return(-1);
 	}
-	if(mmap(to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) == (void*) -1){
+	if (syscall(__NR_mmap, to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) == (void*) -1){
 		return(-1);
 	}
-	if(munmap(from, size) < 0){
+	if (syscall(__NR_munmap, from, size) < 0){
 		return(-1);
 	}
 	return(0);