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

1 files changed, 12 insertions, 39 deletions

diff --git a/arch/alpha/kernel/entry.S b/arch/alpha/kernel/entry.S
index a7607832dd4..f62a994ef12 100644
--- a/arch/alpha/kernel/entry.S
+++ b/arch/alpha/kernel/entry.S
@@ -612,47 +612,24 @@ ret_from_kernel_thread:
  * Special system calls.  Most of these are special in that they either
  * have to play switch_stack games or in some way use the pt_regs struct.
  */
-	.align	4
-	.globl	sys_fork
-	.ent	sys_fork
-sys_fork:
-	.prologue 0
-	mov	$sp, $21
-	bsr	$1, do_switch_stack
-	bis	$31, SIGCHLD, $16
-	mov	$31, $17
-	mov	$31, $18
-	mov	$31, $19
-	mov	$31, $20
-	jsr	$26, alpha_clone
-	bsr	$1, undo_switch_stack
-	ret
-.end sys_fork
 
+.macro	fork_like name
 	.align	4
-	.globl	sys_clone
-	.ent	sys_clone
-sys_clone:
+	.globl	alpha_\name
+	.ent	alpha_\name
+alpha_\name:
 	.prologue 0
-	mov	$sp, $21
 	bsr	$1, do_switch_stack
-	/* $16, $17, $18, $19, $20 come from the user.  */
-	jsr	$26, alpha_clone
-	bsr	$1, undo_switch_stack
+	jsr	$26, sys_\name
+	ldq	$26, 56($sp)
+	lda	$sp, SWITCH_STACK_SIZE($sp)
 	ret
-.end sys_clone
+.end	alpha_\name
+.endm
 
-	.align	4
-	.globl	sys_vfork
-	.ent	sys_vfork
-sys_vfork:
-	.prologue 0
-	mov	$sp, $16
-	bsr	$1, do_switch_stack
-	jsr	$26, alpha_vfork
-	bsr	$1, undo_switch_stack
-	ret
-.end sys_vfork
+fork_like fork
+fork_like vfork
+fork_like clone
 
 	.align	4
 	.globl	sys_sigreturn
@@ -661,8 +638,6 @@ sys_sigreturn:
 	.prologue 0
 	lda	$9, ret_from_straced
 	cmpult	$26, $9, $9
-	mov	$sp, $17
-	lda	$18, -SWITCH_STACK_SIZE($sp)
 	lda	$sp, -SWITCH_STACK_SIZE($sp)
 	jsr	$26, do_sigreturn
 	bne	$9, 1f
@@ -678,8 +653,6 @@ sys_rt_sigreturn:
 	.prologue 0
 	lda	$9, ret_from_straced
 	cmpult	$26, $9, $9
-	mov	$sp, $17
-	lda	$18, -SWITCH_STACK_SIZE($sp)
 	lda	$sp, -SWITCH_STACK_SIZE($sp)
 	jsr	$26, do_rt_sigreturn
 	bne	$9, 1f