um: don't bother with passing sp to do_fork() for fork(2)/vfork(2)

copy_thread() on um will do the right thing when getting 0 for sp...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/arch/um/kernel/syscall.c b/arch/um/kernel/syscall.c
index a81f370..3a87522 100644 (file)
--- a/arch/um/kernel/syscall.c
+++ b/arch/um/kernel/syscall.c
@@ -16,23 +16,19 @@
 
 long sys_fork(void)
 {
-       return do_fork(SIGCHLD, UPT_SP(&current->thread.regs.regs),
+       return do_fork(SIGCHLD, 0,
                      &current->thread.regs, 0, NULL, NULL);
 }
 
 long sys_vfork(void)
 {
-       return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
-                     UPT_SP(&current->thread.regs.regs),
+       return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, 0,
                      &current->thread.regs, 0, NULL, NULL);
 }
 
 long sys_clone(unsigned long clone_flags, unsigned long newsp,
               void __user *parent_tid, void __user *child_tid)
 {
-       if (!newsp)
-               newsp = UPT_SP(&current->thread.regs.regs);
-
        return do_fork(clone_flags, newsp, &current->thread.regs, 0, parent_tid,
                      child_tid);
 }