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

Pull pile 2 of execve and kernel_thread unification work from Al Viro:
 "Stuff in there: kernel_thread/kernel_execve/sys_execve conversions for
  several more architectures plus assorted signal fixes and cleanups.

  There'll be more (in particular, real fixes for the alpha
  do_notify_resume() irq mess)..."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal: (43 commits)
  alpha: don't open-code trace_report_syscall_{enter,exit}
  Uninclude linux/freezer.h
  m32r: trim masks
  avr32: trim masks
  tile: don't bother with SIGTRAP in setup_frame
  microblaze: don't bother with SIGTRAP in setup_rt_frame()
  mn10300: don't bother with SIGTRAP in setup_frame()
  frv: no need to raise SIGTRAP in setup_frame()
  x86: get rid of duplicate code in case of CONFIG_VM86
  unicore32: remove pointless test
  h8300: trim _TIF_WORK_MASK
  parisc: decide whether to go to slow path (tracesys) based on thread flags
  parisc: don't bother looping in do_signal()
  parisc: fix double restarts
  bury the rest of TIF_IRET
  sanitize tsk_is_polling()
  bury _TIF_RESTORE_SIGMASK
  unicore32: unobfuscate _TIF_WORK_MASK
  mips: NOTIFY_RESUME is not needed in TIF masks
  mips: merge the identical "return from syscall" per-ABI code
  ...

Conflicts:
	arch/arm/include/asm/thread_info.h

arch/powerpc/kernel/entry_32.S

@@ -435,6 +435,22 @@ ret_from_fork:
 	li	r3,0
 	b	ret_from_syscall
 
+	.globl	ret_from_kernel_thread
+ret_from_kernel_thread:
+	REST_NVGPRS(r1)
+	bl	schedule_tail
+	mtlr	r14
+	mr	r3,r15
+	PPC440EP_ERR42
+	blrl
+	li	r3,0
+	b	do_exit		# no return
+
+	.globl	__ret_from_kernel_execve
+__ret_from_kernel_execve:
+	addi	r1,r3,-STACK_FRAME_OVERHEAD
+	b	ret_from_syscall
+
 /* Traced system call support */
 syscall_dotrace:
 	SAVE_NVGPRS(r1)

arch/powerpc/kernel/entry_64.S

@@ -370,6 +370,22 @@ _GLOBAL(ret_from_fork)
 	li	r3,0
 	b	syscall_exit
 
+_GLOBAL(ret_from_kernel_thread)
+	bl	.schedule_tail
+	REST_NVGPRS(r1)
+	REST_GPR(2,r1)
+	mtlr	r14
+	mr	r3,r15
+	blrl
+	li	r3,0
+	b	.do_exit	# no return
+
+_GLOBAL(__ret_from_kernel_execve)
+	addi	r1,r3,-STACK_FRAME_OVERHEAD
+	li	r10,1
+	std	r10,SOFTE(r1)
+	b	syscall_exit
+
 	.section	".toc","aw"
 DSCR_DEFAULT:
 	.tc dscr_default[TC],dscr_default

arch/powerpc/kernel/misc.S

@@ -54,13 +54,6 @@ _GLOBAL(add_reloc_offset)
 	.align	3
 2:	PPC_LONG 1b
 
-_GLOBAL(kernel_execve)
-	li	r0,__NR_execve
-	sc
-	bnslr
-	neg	r3,r3
-	blr
-
 _GLOBAL(setjmp)
 	mflr	r0
 	PPC_STL	r0,0(r3)

arch/powerpc/kernel/misc_32.S

@@ -663,39 +663,6 @@ _GLOBAL(abs)
 	sub	r3,r3,r4
 	blr
 
-/*
- * Create a kernel thread
- *   kernel_thread(fn, arg, flags)
- */
-_GLOBAL(kernel_thread)
-	stwu	r1,-16(r1)
-	stw	r30,8(r1)
-	stw	r31,12(r1)
-	mr	r30,r3		/* function */
-	mr	r31,r4		/* argument */
-	ori	r3,r5,CLONE_VM	/* flags */
-	oris	r3,r3,CLONE_UNTRACED>>16
-	li	r4,0		/* new sp (unused) */
-	li	r0,__NR_clone
-	sc
-	bns+	1f		/* did system call indicate error? */
-	neg	r3,r3		/* if so, make return code negative */
-1:	cmpwi	0,r3,0		/* parent or child? */
-	bne	2f		/* return if parent */
-	li	r0,0		/* make top-level stack frame */
-	stwu	r0,-16(r1)
-	mtlr	r30		/* fn addr in lr */
-	mr	r3,r31		/* load arg and call fn */
-	PPC440EP_ERR42
-	blrl
-	li	r0,__NR_exit	/* exit if function returns */
-	li	r3,0
-	sc
-2:	lwz	r30,8(r1)
-	lwz	r31,12(r1)
-	addi	r1,r1,16
-	blr
-
 #ifdef CONFIG_SMP
 _GLOBAL(start_secondary_resume)
 	/* Reset stack */

arch/powerpc/kernel/misc_64.S

@@ -406,40 +406,6 @@ _GLOBAL(scom970_write)
 #endif /* CONFIG_CPU_FREQ_PMAC64 || CONFIG_CPU_FREQ_MAPLE */
 
 
-/*
- * Create a kernel thread
- *   kernel_thread(fn, arg, flags)
- */
-_GLOBAL(kernel_thread)
-	std	r29,-24(r1)
-	std	r30,-16(r1)
-	stdu	r1,-STACK_FRAME_OVERHEAD(r1)
-	mr	r29,r3
-	mr	r30,r4
-	ori	r3,r5,CLONE_VM	/* flags */
-	oris	r3,r3,(CLONE_UNTRACED>>16)
-	li	r4,0		/* new sp (unused) */
-	li	r0,__NR_clone
-	sc
-	bns+	1f		/* did system call indicate error? */
-	neg	r3,r3		/* if so, make return code negative */
-1:	cmpdi	0,r3,0		/* parent or child? */
-	bne	2f		/* return if parent */
-	li	r0,0
-	stdu	r0,-STACK_FRAME_OVERHEAD(r1)
-	ld	r2,8(r29)
-	ld	r29,0(r29)
-	mtlr	r29              /* fn addr in lr */
-	mr	r3,r30	        /* load arg and call fn */
-	blrl
-	li	r0,__NR_exit	/* exit after child exits */
-        li	r3,0
-	sc
-2:	addi	r1,r1,STACK_FRAME_OVERHEAD
-	ld	r29,-24(r1)
-	ld	r30,-16(r1)
-	blr
-
 /*
  * disable_kernel_fp()
  * Disable the FPU.

arch/powerpc/kernel/ppc_ksyms.c

@@ -94,7 +94,6 @@ EXPORT_SYMBOL(pci_dram_offset);
 #endif /* CONFIG_PCI */
 
 EXPORT_SYMBOL(start_thread);
-EXPORT_SYMBOL(kernel_thread);
 
 EXPORT_SYMBOL(giveup_fpu);
 #ifdef CONFIG_ALTIVEC

arch/powerpc/kernel/process.c

@@ -733,30 +733,39 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
 extern unsigned long dscr_default; /* defined in arch/powerpc/kernel/sysfs.c */
 
 int copy_thread(unsigned long clone_flags, unsigned long usp,
-		unsigned long unused, struct task_struct *p,
+		unsigned long arg, struct task_struct *p,
 		struct pt_regs *regs)
 {
 	struct pt_regs *childregs, *kregs;
 	extern void ret_from_fork(void);
+	extern void ret_from_kernel_thread(void);
+	void (*f)(void);
 	unsigned long sp = (unsigned long)task_stack_page(p) + THREAD_SIZE;
 
-	CHECK_FULL_REGS(regs);
 	/* Copy registers */
 	sp -= sizeof(struct pt_regs);
 	childregs = (struct pt_regs *) sp;
-	*childregs = *regs;
-	if ((childregs->msr & MSR_PR) == 0) {
+	if (!regs) {
 		/* for kernel thread, set `current' and stackptr in new task */
+		memset(childregs, 0, sizeof(struct pt_regs));
 		childregs->gpr[1] = sp + sizeof(struct pt_regs);
-#ifdef CONFIG_PPC32
-		childregs->gpr[2] = (unsigned long) p;
-#else
+#ifdef CONFIG_PPC64
+		childregs->gpr[14] = *(unsigned long *)usp;
+		childregs->gpr[2] = ((unsigned long *)usp)[1],
 		clear_tsk_thread_flag(p, TIF_32BIT);
+#else
+		childregs->gpr[14] = usp;	/* function */
+		childregs->gpr[2] = (unsigned long) p;
 #endif
+		childregs->gpr[15] = arg;
 		p->thread.regs = NULL;	/* no user register state */
+		f = ret_from_kernel_thread;
 	} else {
+		CHECK_FULL_REGS(regs);
+		*childregs = *regs;
 		childregs->gpr[1] = usp;
 		p->thread.regs = childregs;
+		childregs->gpr[3] = 0;  /* Result from fork() */
 		if (clone_flags & CLONE_SETTLS) {
 #ifdef CONFIG_PPC64
 			if (!is_32bit_task())
@@ -765,8 +774,9 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 #endif
 				childregs->gpr[2] = childregs->gpr[6];
 		}
+
+		f = ret_from_fork;
 	}
-	childregs->gpr[3] = 0;  /* Result from fork() */
 	sp -= STACK_FRAME_OVERHEAD;
 
 	/*
@@ -805,19 +815,17 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 		p->thread.dscr = current->thread.dscr;
 	}
 #endif
-
 	/*
 	 * The PPC64 ABI makes use of a TOC to contain function 
 	 * pointers.  The function (ret_from_except) is actually a pointer
 	 * to the TOC entry.  The first entry is a pointer to the actual
 	 * function.
- 	 */
+	 */
 #ifdef CONFIG_PPC64
-	kregs->nip = *((unsigned long *)ret_from_fork);
+	kregs->nip = *((unsigned long *)f);
 #else
-	kregs->nip = (unsigned long)ret_from_fork;
+	kregs->nip = (unsigned long)f;
 #endif
-
 	return 0;
 }
 
@@ -1055,26 +1063,13 @@ int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3,
 			regs, 0, NULL, NULL);
 }
 
-int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,
-	       unsigned long a3, unsigned long a4, unsigned long a5,
-	       struct pt_regs *regs)
-{
-	int error;
-	char *filename;
+void __ret_from_kernel_execve(struct pt_regs *normal)
+__noreturn;
 
-	filename = getname((const char __user *) a0);
-	error = PTR_ERR(filename);
-	if (IS_ERR(filename))
-		goto out;
-	flush_fp_to_thread(current);
-	flush_altivec_to_thread(current);
-	flush_spe_to_thread(current);
-	error = do_execve(filename,
-			  (const char __user *const __user *) a1,
-			  (const char __user *const __user *) a2, regs);
-	putname(filename);
-out:
-	return error;
+void ret_from_kernel_execve(struct pt_regs *normal)
+{
+	set_thread_flag(TIF_RESTOREALL);
+	__ret_from_kernel_execve(normal);
 }
 
 static inline int valid_irq_stack(unsigned long sp, struct task_struct *p,

arch/powerpc/kernel/signal_32.c

@@ -35,7 +35,6 @@
 #include <linux/stddef.h>
 #include <linux/tty.h>
 #include <linux/binfmts.h>
-#include <linux/freezer.h>
 #endif
 
 #include <asm/uaccess.h>

arch/powerpc/kernel/sys_ppc32.c

@@ -156,28 +156,6 @@ asmlinkage long compat_sys_sendfile64_wrapper(u32 out_fd, u32 in_fd,
 			    (off_t __user *)offset, count);
 }
 
-long compat_sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,
-		  unsigned long a3, unsigned long a4, unsigned long a5,
-		  struct pt_regs *regs)
-{
-	int error;
-	char * filename;
-	
-	filename = getname((char __user *) a0);
-	error = PTR_ERR(filename);
-	if (IS_ERR(filename))
-		goto out;
-	flush_fp_to_thread(current);
-	flush_altivec_to_thread(current);
-
-	error = compat_do_execve(filename, compat_ptr(a1), compat_ptr(a2), regs);
-
-	putname(filename);
-
-out:
-	return error;
-}
-
 /* Note: it is necessary to treat option as an unsigned int, 
  * with the corresponding cast to a signed int to insure that the 
  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)