Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

Pull big execve/kernel_thread/fork unification series from Al Viro:
 "All architectures are converted to new model.  Quite a bit of that
  stuff is actually shared with architecture trees; in such cases it's
  literally shared branch pulled by both, not a cherry-pick.

  A lot of ugliness and black magic is gone (-3KLoC total in this one):

   - kernel_thread()/kernel_execve()/sys_execve() redesign.

     We don't do syscalls from kernel anymore for either kernel_thread()
     or kernel_execve():

     kernel_thread() is essentially clone(2) with callback run before we
     return to userland, the callbacks either never return or do
     successful do_execve() before returning.

     kernel_execve() is a wrapper for do_execve() - it doesn't need to
     do transition to user mode anymore.

     As a result kernel_thread() and kernel_execve() are
     arch-independent now - they live in kernel/fork.c and fs/exec.c
     resp.  sys_execve() is also in fs/exec.c and it's completely
     architecture-independent.

   - daemonize() is gone, along with its parts in fs/*.c

   - struct pt_regs * is no longer passed to do_fork/copy_process/
     copy_thread/do_execve/search_binary_handler/->load_binary/do_coredump.

   - sys_fork()/sys_vfork()/sys_clone() unified; some architectures
     still need wrappers (ones with callee-saved registers not saved in
     pt_regs on syscall entry), but the main part of those suckers is in
     kernel/fork.c now."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal: (113 commits)
  do_coredump(): get rid of pt_regs argument
  print_fatal_signal(): get rid of pt_regs argument
  ptrace_signal(): get rid of unused arguments
  get rid of ptrace_signal_deliver() arguments
  new helper: signal_pt_regs()
  unify default ptrace_signal_deliver
  flagday: kill pt_regs argument of do_fork()
  death to idle_regs()
  don't pass regs to copy_process()
  flagday: don't pass regs to copy_thread()
  bfin: switch to generic vfork, get rid of pointless wrappers
  xtensa: switch to generic clone()
  openrisc: switch to use of generic fork and clone
  unicore32: switch to generic clone(2)
  score: switch to generic fork/vfork/clone
  c6x: sanitize copy_thread(), get rid of clone(2) wrapper, switch to generic clone()
  take sys_fork/sys_vfork/sys_clone prototypes to linux/syscalls.h
  mn10300: switch to generic fork/vfork/clone
  h8300: switch to generic fork/vfork/clone
  tile: switch to generic clone()
  ...

Conflicts:
	arch/microblaze/include/asm/Kbuild

2 files changed, 2 insertions, 26 deletions

diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index b6d699cdd557..b462b13c5bae 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -161,8 +161,7 @@ void fork_handler(void)
 }
 
 int copy_thread(unsigned long clone_flags, unsigned long sp,
-                unsigned long arg, struct task_struct * p,
-                struct pt_regs *regs)
+                unsigned long arg, struct task_struct * p)
 {
         void (*handler)(void);
         int kthread = current->flags & PF_KTHREAD;
@@ -171,7 +170,7 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
         p->thread = (struct thread_struct) INIT_THREAD;
 
         if (!kthread) {
-                memcpy(&p->thread.regs.regs, &regs->regs,
+                memcpy(&p->thread.regs.regs, current_pt_regs(),
                        sizeof(p->thread.regs.regs));
                 PT_REGS_SET_SYSCALL_RETURN(&p->thread.regs, 0);
                 if (sp != 0)
diff --git a/arch/um/kernel/syscall.c b/arch/um/kernel/syscall.c
index a81f3705e90f..c1d0ae069b53 100644
--- a/arch/um/kernel/syscall.c
+++ b/arch/um/kernel/syscall.c
@@ -14,29 +14,6 @@
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
 
-long sys_fork(void)
-{
-        return do_fork(SIGCHLD, UPT_SP(&current->thread.regs.regs),
-                      &current->thread.regs, 0, NULL, NULL);
-}
-
-long sys_vfork(void)
-{
-        return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
-                      UPT_SP(&current->thread.regs.regs),
-                      &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);
-}
-
 long old_mmap(unsigned long addr, unsigned long len,
               unsigned long prot, unsigned long flags,
               unsigned long fd, unsigned long offset)