uml: miscellaneous code cleanups

Code tidying -
	the pid field of struct irq_fd isn't used, so it is removed
     	os_set_fd_async needed to read flags before changing them, it
doesn't need a pid passed in because it can call getpid itself, and a
block of unused code needed deleting
	os_get_exec_close was unused, so it is removed
	ptrace_child called _exit for historical reasons which are no
longer valid, so just calls exit instead

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

7 files changed, 18 insertions, 40 deletions

diff --git a/arch/um/include/irq_user.h b/arch/um/include/irq_user.h
index 884a9c17eea0..e60b31873de1 100644
--- a/arch/um/include/irq_user.h
+++ b/arch/um/include/irq_user.h
@@ -14,7 +14,6 @@ struct irq_fd {
         int fd;
         int type;
         int irq;
-        int pid;
         int events;
         int current_events;
 };
diff --git a/arch/um/include/os.h b/arch/um/include/os.h
index 9428d34792ca..fdac1a55d031 100644
--- a/arch/um/include/os.h
+++ b/arch/um/include/os.h
@@ -127,7 +127,6 @@ static inline struct openflags of_cloexec(struct openflags flags)
 extern int os_stat_file(const char *file_name, struct uml_stat *buf);
 extern int os_stat_fd(const int fd, struct uml_stat *buf);
 extern int os_access(const char *file, int mode);
-extern int os_get_exec_close(int fd, int *close_on_exec);
 extern int os_set_exec_close(int fd);
 extern int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg);
 extern int os_get_ifname(int fd, char *namebuf);
@@ -142,7 +141,7 @@ extern int os_write_file(int fd, const void *buf, int count);
 extern int os_file_size(const char *file, unsigned long long *size_out);
 extern int os_file_modtime(const char *file, unsigned long *modtime);
 extern int os_pipe(int *fd, int stream, int close_on_exec);
-extern int os_set_fd_async(int fd, int owner);
+extern int os_set_fd_async(int fd);
 extern int os_clear_fd_async(int fd);
 extern int os_set_fd_block(int fd, int blocking);
 extern int os_accept_connection(int fd);
diff --git a/arch/um/kernel/irq.c b/arch/um/kernel/irq.c
index ba11ccd6a8a3..91587f8db340 100644
--- a/arch/um/kernel/irq.c
+++ b/arch/um/kernel/irq.c
@@ -107,10 +107,9 @@ int activate_fd(int irq, int fd, int type, void *dev_id)
         struct pollfd *tmp_pfd;
         struct irq_fd *new_fd, *irq_fd;
         unsigned long flags;
-        int pid, events, err, n;
+        int events, err, n;
 
-        pid = os_getpid();
-        err = os_set_fd_async(fd, pid);
+        err = os_set_fd_async(fd);
         if (err < 0)
                 goto out;
 
@@ -127,7 +126,6 @@ int activate_fd(int irq, int fd, int type, void *dev_id)
                                      .fd                = fd,
                                      .type              = type,
                                      .irq               = irq,
-                                     .pid               = pid,
                                      .events            = events,
                                      .current_events    = 0 } );
 
diff --git a/arch/um/kernel/ksyms.c b/arch/um/kernel/ksyms.c
index 187a756f3e5b..5311ee93ede3 100644
--- a/arch/um/kernel/ksyms.c
+++ b/arch/um/kernel/ksyms.c
@@ -36,7 +36,6 @@ EXPORT_SYMBOL(uml_strdup);
 EXPORT_SYMBOL(os_stat_fd);
 EXPORT_SYMBOL(os_stat_file);
 EXPORT_SYMBOL(os_access);
-EXPORT_SYMBOL(os_get_exec_close);
 EXPORT_SYMBOL(os_set_exec_close);
 EXPORT_SYMBOL(os_getpid);
 EXPORT_SYMBOL(os_open_file);
diff --git a/arch/um/kernel/smp.c b/arch/um/kernel/smp.c
index a12e5bd15790..869ac6802209 100644
--- a/arch/um/kernel/smp.c
+++ b/arch/um/kernel/smp.c
@@ -74,8 +74,7 @@ static int idle_proc(void *cpup)
         if (err < 0)
                 panic("CPU#%d failed to create IPI pipe, err = %d", cpu, -err);
 
-        os_set_fd_async(cpu_data[cpu].ipi_pipe[0],
-                     current->thread.mode.tt.extern_pid);
+        os_set_fd_async(cpu_data[cpu].ipi_pipe[0]);
 
         wmb();
         if (cpu_test_and_set(cpu, cpu_callin_map)) {
@@ -128,8 +127,7 @@ void smp_prepare_cpus(unsigned int maxcpus)
         if (err < 0)
                 panic("CPU#0 failed to create IPI pipe, errno = %d", -err);
 
-        os_set_fd_async(cpu_data[me].ipi_pipe[0],
-                     current->thread.mode.tt.extern_pid);
+        os_set_fd_async(cpu_data[me].ipi_pipe[0]);
 
         for (cpu = 1; cpu < ncpus; cpu++) {
                 printk(KERN_INFO "Booting processor %d...\n", cpu);
diff --git a/arch/um/os-Linux/file.c b/arch/um/os-Linux/file.c
index 9387cb11c0ad..4f547d75b17e 100644
--- a/arch/um/os-Linux/file.c
+++ b/arch/um/os-Linux/file.c
@@ -328,19 +328,6 @@ int os_file_modtime(const char *file, unsigned long *modtime)
         return 0;
 }
 
-int os_get_exec_close(int fd, int *close_on_exec)
-{
-        int ret;
-
-        CATCH_EINTR(ret = fcntl(fd, F_GETFD));
-
-        if(ret < 0)
-                return -errno;
-
-        *close_on_exec = (ret & FD_CLOEXEC) ? 1 : 0;
-        return ret;
-}
-
 int os_set_exec_close(int fd)
 {
         int err;
@@ -380,30 +367,27 @@ int os_pipe(int *fds, int stream, int close_on_exec)
         return err;
 }
 
-int os_set_fd_async(int fd, int owner)
+int os_set_fd_async(int fd)
 {
-        int err;
+        int err, flags;
+
+        flags = fcntl(fd, F_GETFL);
+        if (flags < 0)
+                return -errno;
 
-        /* XXX This should do F_GETFL first */
-        if(fcntl(fd, F_SETFL, O_ASYNC | O_NONBLOCK) < 0){
+        flags |= O_ASYNC | O_NONBLOCK;
+        if (fcntl(fd, F_SETFL, flags) < 0) {
                 err = -errno;
                 printk("os_set_fd_async : failed to set O_ASYNC and "
                        "O_NONBLOCK on fd # %d, errno = %d\n", fd, errno);
                 return err;
         }
-#ifdef notdef
-        if(fcntl(fd, F_SETFD, 1) < 0){
-                printk("os_set_fd_async : Setting FD_CLOEXEC failed, "
-                       "errno = %d\n", errno);
-        }
-#endif
 
-        if((fcntl(fd, F_SETSIG, SIGIO) < 0) ||
-           (fcntl(fd, F_SETOWN, owner) < 0)){
+        if ((fcntl(fd, F_SETSIG, SIGIO) < 0) ||
+            (fcntl(fd, F_SETOWN, os_getpid()) < 0)) {
                 err = -errno;
                 printk("os_set_fd_async : Failed to fcntl F_SETOWN "
-                       "(or F_SETSIG) fd %d to pid %d, errno = %d\n", fd,
-                       owner, errno);
+                       "(or F_SETSIG) fd %d, errno = %d\n", fd, errno);
                 return err;
         }
 
diff --git a/arch/um/os-Linux/start_up.c b/arch/um/os-Linux/start_up.c
index 6d56d15884fd..bcf0c9b86b10 100644
--- a/arch/um/os-Linux/start_up.c
+++ b/arch/um/os-Linux/start_up.c
@@ -60,7 +60,8 @@ static int ptrace_child(void)
                  * the UML code itself.
                  */
                 ret = 2;
-        _exit(ret);
+
+        exit(ret);
 }
 
 static void fatal_perror(const char *str)