ppc64: fix sys_clone bug (paulus) and fix fork arguments (Milton Miller)

arch/ppc64/Kconfig

@@ -63,10 +63,7 @@ config SMP
 	---help---
 	  This enables support for systems with more than one CPU. If you have
 	  a system with only one CPU, say N. If you have a system with more
-	  than one CPU, say Y.  Note that the kernel does not currently
-	  support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
-	  since they have inadequate hardware support for multiprocessor
-	  operation.
+	  than one CPU, say Y.
 
 	  If you say N here, the kernel will run on single and multiprocessor
 	  machines, but will use only one CPU of a multiprocessor machine. If
@@ -74,16 +71,15 @@ config SMP
 	  On a single-processor machine, the kernel will run faster if you say
 	  N here.
 
-	  If you don't know what to do here, say N.
+	  If you don't know what to do here, say Y.
 
 config IRQ_ALL_CPUS
 	bool "Distribute interrupts on all CPUs by default"
-	depends on SMP
+	depends on SMP && PPC_PSERIES
 	help
 	  This option gives the kernel permission to distribute IRQs across
 	  multiple CPUs.  Saying N here will route all IRQs to the first
-	  CPU.  Generally saying Y is safe, although some problems have been
-	  reported with SMP Power Macintoshes with this option enabled.
+	  CPU.
 
 config NR_CPUS
 	int "Maximum number of CPUs (2-64)"
@@ -468,13 +464,24 @@ config VIOCONS
 
 config VIODASD
 	tristate "iSeries Virtual I/O disk support"
+	help
+	  If you are running on an iSeries system and you want to use
+ 	  virtual disks created and managed by OS/400, say Y.
 
 config VIODASD_IDE
 	bool "iSeries Virtual disk IDE emulation"
 	depends on VIODASD
+	help
+	  This causes the iSeries virtual disks to look like IDE disks.
+	  If you have programs or utilities that only support certain
+	  kinds of disks, this option will cause iSeries virtual disks
+	  to pretend to be IDE disks, which may satisfy the program.
 
 config VIOCD
 	tristate "iSeries Virtual I/O CD support"
+	help
+	  If you are running Linux on an IBM iSeries system and you want to
+	  read a CD drive owned by OS/400, say Y here.
 
 config VIOCD_AZTECH
 	bool "iSeries Virtual CD Aztech emulation"
@@ -482,6 +489,9 @@ config VIOCD_AZTECH
 
 config VIOTAPE
 	tristate "iSeries Virtual Tape Support"
+	help
+	  If you are running Linux on an iSeries system and you want Linux
+	  to read and/or write a tape drive owned by OS/400, say Y here.
 
 config VETH
 	tristate "iSeries Virtual Ethernet driver support"
@@ -498,10 +508,17 @@ menu "Kernel hacking"
 
 config DEBUG_KERNEL
 	bool "Kernel debugging"
+	help
+	  Say Y here if you are developing drivers or trying to debug and
+	  identify kernel problems.
 
 config DEBUG_SLAB
 	bool "Debug memory allocations"
 	depends on DEBUG_KERNEL
+	help
+	  Say Y here to have the kernel do limited verification on memory
+	  allocation as well as poisoning memory on free to catch use of freed
+	  memory.
 
 config MAGIC_SYSRQ
 	bool "Magic SysRq key"

arch/ppc64/defconfig

@@ -636,7 +636,7 @@ CONFIG_XMON_DEFAULT=y
 #
 # Security options
 #
-CONFIG_SECURITY_CAPABILITIES=y
+# CONFIG_SECURITY is not set
 
 #
 # Cryptographic options

arch/ppc64/kernel/misc.S

@@ -485,8 +485,10 @@ _GLOBAL(cvt_df)
 _GLOBAL(kernel_thread)
 	/* XXX fix this when we optimise syscall entry to not save volatiles */
 	mr	r6,r3		/* function */
+	mr	r7,r4		/* arg */
 	ori	r3,r5,CLONE_VM	/* flags */
 	oris	r3,r3,(CLONE_UNTRACED>>16)
+	li	r4,0		/* new sp (unused) */
 	li	r0,__NR_clone
 	sc
 	cmpi	0,r3,0		/* parent or child? */
@@ -496,7 +498,7 @@ _GLOBAL(kernel_thread)
 	ld	r2,8(r6)
 	ld	r6,0(r6)
 	mtlr	r6              /* fn addr in lr */
-	mr	r3,r4	        /* load arg and call fn */
+	mr	r3,r7	        /* load arg and call fn */
 	blrl
 	li	r0,__NR_exit	/* exit after child exits */
         li	r3,0

arch/ppc64/kernel/process.c

@@ -191,8 +191,10 @@ copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
 #ifdef CONFIG_PPC_ISERIES
 		set_ti_thread_flag(p->thread_info, TIF_RUN_LIGHT);
 #endif
-	} else
+	} else {
+		childregs->gpr[1] = usp;
 		p->thread.regs = childregs;
+	}
 	childregs->gpr[3] = 0;  /* Result from fork() */
 	sp -= STACK_FRAME_OVERHEAD;
 
@@ -266,13 +268,17 @@ int get_fpexc_mode(struct task_struct *tsk, unsigned long adr)
 	return put_user(val, (unsigned int *) adr);
 }
 
-int sys_clone(unsigned long clone_flags, u32 p2, u32 p3, u32 p4, u32 p5,
-	      u32 p6, struct pt_regs *regs)
+int sys_clone(unsigned long clone_flags, unsigned long p2, unsigned long p3,
+	      unsigned long p4, unsigned long p5, unsigned long p6,
+	      struct pt_regs *regs)
 {
 	struct task_struct *p;
 	unsigned long parent_tidptr = 0;
 	unsigned long child_tidptr = 0;
 
+	if (p2 == 0)
+		p2 = regs->gpr[1];	/* stack pointer for child */
+
 	if (clone_flags & (CLONE_PARENT_SETTID | CLONE_CHILD_SETTID |
 			   CLONE_CHILD_CLEARTID)) {
 		parent_tidptr = p3;
@@ -286,12 +292,13 @@ int sys_clone(unsigned long clone_flags, u32 p2, u32 p3, u32 p4, u32 p5,
 	if (regs->msr & MSR_FP)
 		giveup_fpu(current);
 
-	p = do_fork(clone_flags & ~CLONE_IDLETASK, regs->gpr[1], regs, 0,
+	p = do_fork(clone_flags & ~CLONE_IDLETASK, p2, regs, 0,
 		    (int *)parent_tidptr, (int *)child_tidptr);
 	return IS_ERR(p) ? PTR_ERR(p) : p->pid;
 }
 
-int sys_fork(u32 p1, u32 p2, u32 p3, u32 p4, u32 p5, u32 p6,
+int sys_fork(unsigned long p1, unsigned long p2, unsigned long p3,
+	     unsigned long p4, unsigned long p5, unsigned long p6,
 	     struct pt_regs *regs)
 {
 	struct task_struct *p;
@@ -303,7 +310,8 @@ int sys_fork(u32 p1, u32 p2, u32 p3, u32 p4, u32 p5, u32 p6,
 	return IS_ERR(p) ? PTR_ERR(p) : p->pid;
 }
 
-int sys_vfork(u32 p1, u32 p2, u32 p3, u32 p4, u32 p5, u32 p6,
+int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3,
+	      unsigned long p4, unsigned long p5, unsigned long p6,
 	      struct pt_regs *regs)
 {
 	struct task_struct *p;