Merge sgi.com:/source2/linux-2.6 into sgi.com:/source2/xfs-linux-2.6

arch/alpha/mm/numa.c

@@ -279,8 +279,8 @@ setup_memory(void *kernel_end)
 				       initrd_end,
 				       phys_to_virt(PFN_PHYS(max_low_pfn)));
 		} else {
-			nid = NODE_DATA(kvaddr_to_nid(initrd_start));
-			reserve_bootmem_node(nid,
+			nid = kvaddr_to_nid(initrd_start);
+			reserve_bootmem_node(NODE_DATA(nid),
 					     virt_to_phys((void *)initrd_start),
 					     INITRD_SIZE);
 		}

arch/ppc64/Kconfig

@@ -198,7 +198,6 @@ config SCHED_SMT
 
 config PREEMPT
 	bool "Preemptible Kernel"
-	depends on BROKEN
 	help
 	  This option reduces the latency of the kernel when reacting to
 	  real-time or interactive events by allowing a low priority process to

arch/ppc64/kernel/align.c

@@ -22,8 +22,6 @@
 #include <asm/cache.h>
 #include <asm/cputable.h>
 
-void disable_kernel_fp(void); /* asm function from head.S */
-
 struct aligninfo {
 	unsigned char len;
 	unsigned char flags;
@@ -280,8 +278,11 @@ fix_alignment(struct pt_regs *regs)
 	}
 
 	/* Force the fprs into the save area so we can reference them */
-	if ((flags & F) && (regs->msr & MSR_FP))
-		giveup_fpu(current);
+	if (flags & F) {
+		if (!user_mode(regs))
+			return 0;
+		flush_fp_to_thread(current);
+	}
 	
 	/* If we are loading, get the data from user space */
 	if (flags & LD) {
@@ -310,9 +311,11 @@ fix_alignment(struct pt_regs *regs)
 		if (flags & F) {
 			if (nb == 4) {
 				/* Doing stfs, have to convert to single */
+				preempt_disable();
 				enable_kernel_fp();
 				cvt_df(&current->thread.fpr[reg], (float *)&data.v[4], &current->thread.fpscr);
 				disable_kernel_fp();
+				preempt_enable();
 			}
 			else
 				data.dd = current->thread.fpr[reg];
@@ -344,9 +347,11 @@ fix_alignment(struct pt_regs *regs)
 		if (flags & F) {
 			if (nb == 4) {
 				/* Doing lfs, have to convert to double */
+				preempt_disable();
 				enable_kernel_fp();
 				cvt_fd((float *)&data.v[4], &current->thread.fpr[reg], &current->thread.fpscr);
 				disable_kernel_fp();
+				preempt_enable();
 			}
 			else
 				current->thread.fpr[reg] = data.dd;

arch/ppc64/kernel/asm-offsets.c

@@ -48,6 +48,8 @@ int main(void)
 	DEFINE(THREAD_SHIFT, THREAD_SHIFT);
 	DEFINE(THREAD_SIZE, THREAD_SIZE);
 	DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
+	DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count));
+	DEFINE(TI_SC_NOERR, offsetof(struct thread_info, syscall_noerror));
 
 	/* task_struct->thread */
 	DEFINE(THREAD, offsetof(struct task_struct, thread));
@@ -99,7 +101,10 @@ int main(void)
 	DEFINE(PACALPPACA, offsetof(struct paca_struct, xLpPaca));
         DEFINE(LPPACA, offsetof(struct paca_struct, xLpPaca));
         DEFINE(PACAREGSAV, offsetof(struct paca_struct, xRegSav));
-        DEFINE(PACAEXC, offsetof(struct paca_struct, exception_stack));
+        DEFINE(PACA_EXGEN, offsetof(struct paca_struct, exgen));
+        DEFINE(PACA_EXMC, offsetof(struct paca_struct, exmc));
+        DEFINE(PACA_EXSLB, offsetof(struct paca_struct, exslb));
+        DEFINE(PACA_EXDSI, offsetof(struct paca_struct, exdsi));
         DEFINE(PACAGUARD, offsetof(struct paca_struct, guard));
         DEFINE(LPPACASRR0, offsetof(struct ItLpPaca, xSavedSrr0));
         DEFINE(LPPACASRR1, offsetof(struct ItLpPaca, xSavedSrr1));
@@ -136,6 +141,10 @@ int main(void)
 	DEFINE(GPR7, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[7]));
 	DEFINE(GPR8, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[8]));
 	DEFINE(GPR9, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[9]));
+	DEFINE(GPR10, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[10]));
+	DEFINE(GPR11, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[11]));
+	DEFINE(GPR12, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[12]));
+	DEFINE(GPR13, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[13]));
 	DEFINE(GPR20, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[20]));
 	DEFINE(GPR21, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[21]));
 	DEFINE(GPR22, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[22]));
@@ -154,7 +163,7 @@ int main(void)
 	DEFINE(_DSISR, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, dsisr));
 	DEFINE(ORIG_GPR3, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, orig_gpr3));
 	DEFINE(RESULT, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, result));
-	DEFINE(TRAP, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, trap));
+	DEFINE(_TRAP, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, trap));
 	DEFINE(SOFTE, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, softe));
 
 	/* These _only_ to be used with {PROM,RTAS}_FRAME_SIZE!!! */

arch/ppc64/kernel/misc.S

@@ -85,16 +85,17 @@ _GLOBAL(local_irq_restore)
 	cmpw	0,r3,r5
 	beqlr
 	/* are we enabling interrupts? */
-	cmpi	0,r3,0
+	cmpdi	0,r3,0
 	stb	r3,PACAPROCENABLED(r13)
 	beqlr
 	/* Check pending interrupts */
 	/*   A decrementer, IPI or PMC interrupt may have occurred
 	 *   while we were in the hypervisor (which enables) */
-	CHECKANYINT(r4,r5)
+	ld	r4,PACALPPACA+LPPACAANYINT(r13)
+	cmpdi	r4,0
 	beqlr
 
-	/* 
+	/*
 	 * Handle pending interrupts in interrupt context
 	 */
 	li	r0,0x5555
@@ -608,7 +609,7 @@ _GLOBAL(kernel_thread)
 _GLOBAL(sys_call_table32)
 	.llong .sys_restart_syscall	/* 0 */
 	.llong .sys_exit
-	.llong .sys_fork
+	.llong .ppc_fork
 	.llong .sys_read
 	.llong .sys_write
 	.llong .sys32_open		/* 5 */
@@ -678,7 +679,7 @@ _GLOBAL(sys_call_table32)
 	.llong .sys32_ssetmask
 	.llong .sys_setreuid	        /* 70 */
 	.llong .sys_setregid
-	.llong .sys32_sigsuspend
+	.llong .ppc32_sigsuspend
 	.llong .compat_sys_sigpending
 	.llong .sys32_sethostname
 	.llong .compat_sys_setrlimit	        /* 75 */
@@ -726,7 +727,7 @@ _GLOBAL(sys_call_table32)
 	.llong .sys32_ipc
 	.llong .sys_fsync
 	.llong .ppc32_sigreturn
-	.llong .sys_clone		/* 120 */
+	.llong .ppc_clone		/* 120 */
 	.llong .sys32_setdomainname
 	.llong .ppc64_newuname
 	.llong .sys_ni_syscall		/* old modify_ldt syscall */
@@ -784,7 +785,7 @@ _GLOBAL(sys_call_table32)
 	.llong .sys32_rt_sigpending     /* 175 */
 	.llong .sys32_rt_sigtimedwait
 	.llong .sys32_rt_sigqueueinfo
-	.llong .sys32_rt_sigsuspend
+	.llong .ppc32_rt_sigsuspend
 	.llong .sys32_pread64
 	.llong .sys32_pwrite64	        /* 180 */
 	.llong .sys_chown
@@ -795,7 +796,7 @@ _GLOBAL(sys_call_table32)
 	.llong .sys32_sendfile
 	.llong .sys_ni_syscall		/* reserved for streams1 */
 	.llong .sys_ni_syscall		/* reserved for streams2 */
-	.llong .sys_vfork
+	.llong .ppc_vfork
 	.llong .compat_sys_getrlimit	        /* 190 */
 	.llong .sys32_readahead
 	.llong .sys32_mmap2
@@ -880,7 +881,7 @@ _GLOBAL(sys_call_table32)
 _GLOBAL(sys_call_table)
 	.llong .sys_restart_syscall	/* 0 */
 	.llong .sys_exit
-	.llong .sys_fork
+	.llong .ppc_fork
 	.llong .sys_read
 	.llong .sys_write
 	.llong .sys_open		/* 5 */
@@ -998,7 +999,7 @@ _GLOBAL(sys_call_table)
 	.llong .sys_ipc
 	.llong .sys_fsync
 	.llong .sys_ni_syscall
-	.llong .sys_clone		/* 120 */
+	.llong .ppc_clone		/* 120 */
 	.llong .sys_setdomainname
 	.llong .ppc64_newuname
 	.llong .sys_ni_syscall		/* old modify_ldt syscall */
@@ -1056,7 +1057,7 @@ _GLOBAL(sys_call_table)
 	.llong .sys_rt_sigpending	/* 175 */
 	.llong .sys_rt_sigtimedwait
 	.llong .sys_rt_sigqueueinfo
-	.llong .sys_rt_sigsuspend
+	.llong .ppc64_rt_sigsuspend
 	.llong .sys_pread64
 	.llong .sys_pwrite64	        /* 180 */
 	.llong .sys_chown
@@ -1067,7 +1068,7 @@ _GLOBAL(sys_call_table)
 	.llong .sys_sendfile64
 	.llong .sys_ni_syscall		/* reserved for streams1 */
 	.llong .sys_ni_syscall		/* reserved for streams2 */
-	.llong .sys_vfork
+	.llong .ppc_vfork
 	.llong .sys_getrlimit	        /* 190 */
 	.llong .sys_readahead
 	.llong .sys_ni_syscall		/* 32bit only mmap2 */

arch/ppc64/kernel/pacaData.c

@@ -62,8 +62,6 @@ struct systemcfg *systemcfg;
 		.xDesc = 0xd397d9e2,	/* "LpRS" */			    \
 		.xSize = sizeof(struct ItLpRegSave)			    \
 	},								    \
-	.exception_sp =							    \
-		(&paca[number].exception_stack[0]) - EXC_FRAME_SIZE,	    \
 }
 
 struct paca_struct paca[] __page_aligned = {

arch/ppc64/kernel/process.c

@@ -65,8 +65,43 @@ struct mm_struct ioremap_mm = {
 	.page_table_lock = SPIN_LOCK_UNLOCKED,
 };
 
+/*
+ * Make sure the floating-point register state in the
+ * the thread_struct is up to date for task tsk.
+ */
+void flush_fp_to_thread(struct task_struct *tsk)
+{
+	if (tsk->thread.regs) {
+		/*
+		 * We need to disable preemption here because if we didn't,
+		 * another process could get scheduled after the regs->msr
+		 * test but before we have finished saving the FP registers
+		 * to the thread_struct.  That process could take over the
+		 * FPU, and then when we get scheduled again we would store
+		 * bogus values for the remaining FP registers.
+		 */
+		preempt_disable();
+		if (tsk->thread.regs->msr & MSR_FP) {
+#ifdef CONFIG_SMP
+			/*
+			 * This should only ever be called for current or
+			 * for a stopped child process.  Since we save away
+			 * the FP register state on context switch on SMP,
+			 * there is something wrong if a stopped child appears
+			 * to still have its FP state in the CPU registers.
+			 */
+			BUG_ON(tsk != current);
+#endif
+			giveup_fpu(current);
+		}
+		preempt_enable();
+	}
+}
+
 void enable_kernel_fp(void)
 {
+	WARN_ON(preemptible());
+
 #ifdef CONFIG_SMP
 	if (current->thread.regs && (current->thread.regs->msr & MSR_FP))
 		giveup_fpu(current);
@@ -80,12 +115,9 @@ EXPORT_SYMBOL(enable_kernel_fp);
 
 int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpregs)
 {
-	struct pt_regs *regs = tsk->thread.regs;
-
-	if (!regs)
+	if (!tsk->thread.regs)
 		return 0;
-	if (tsk == current && (regs->msr & MSR_FP))
-		giveup_fpu(current);
+	flush_fp_to_thread(current);
 
 	memcpy(fpregs, &tsk->thread.fpr[0], sizeof(*fpregs));
 
@@ -96,6 +128,8 @@ int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpregs)
 
 void enable_kernel_altivec(void)
 {
+	WARN_ON(preemptible());
+
 #ifdef CONFIG_SMP
 	if (current->thread.regs && (current->thread.regs->msr & MSR_VEC))
 		giveup_altivec(current);
@@ -107,10 +141,29 @@ void enable_kernel_altivec(void)
 }
 EXPORT_SYMBOL(enable_kernel_altivec);
 
+/*
+ * Make sure the VMX/Altivec register state in the
+ * the thread_struct is up to date for task tsk.
+ */
+void flush_altivec_to_thread(struct task_struct *tsk)
+{
+#ifdef CONFIG_ALTIVEC
+	if (tsk->thread.regs) {
+		preempt_disable();
+		if (tsk->thread.regs->msr & MSR_VEC) {
+#ifdef CONFIG_SMP
+			BUG_ON(tsk != current);
+#endif
+			giveup_altivec(current);
+		}
+		preempt_enable();
+	}
+#endif
+}
+
 int dump_task_altivec(struct pt_regs *regs, elf_vrregset_t *vrregs)
 {
-	if (regs->msr & MSR_VEC)
-		giveup_altivec(current);
+	flush_altivec_to_thread(current);
 	memcpy(vrregs, &current->thread.vr[0], sizeof(*vrregs));
 	return 1;
 }
@@ -166,6 +219,7 @@ struct task_struct *__switch_to(struct task_struct *prev,
 void show_regs(struct pt_regs * regs)
 {
 	int i;
+	unsigned long trap;
 
 	printk("NIP: %016lX XER: %016lX LR: %016lX\n",
 	       regs->nip, regs->xer, regs->link);
@@ -176,7 +230,8 @@ void show_regs(struct pt_regs * regs)
 	       regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
 	       regs->msr&MSR_IR ? 1 : 0,
 	       regs->msr&MSR_DR ? 1 : 0);
-	if (regs->trap == 0x300 || regs->trap == 0x380 || regs->trap == 0x600)
+	trap = TRAP(regs);
+	if (trap == 0x300 || trap == 0x380 || trap == 0x600)
 		printk("DAR: %016lx, DSISR: %016lx\n", regs->dar, regs->dsisr);
 	printk("TASK: %p[%d] '%s' THREAD: %p",
 	       current, current->pid, current->comm, current->thread_info);
@@ -191,6 +246,8 @@ void show_regs(struct pt_regs * regs)
 		}
 
 		printk("%016lX ", regs->gpr[i]);
+		if (i == 13 && !FULL_REGS(regs))
+			break;
 	}
 	printk("\n");
 	/*
@@ -245,16 +302,8 @@ release_thread(struct task_struct *t)
  */
 void prepare_to_copy(struct task_struct *tsk)
 {
-	struct pt_regs *regs = tsk->thread.regs;
-
-	if (regs == NULL)
-		return;
-	if (regs->msr & MSR_FP)
-		giveup_fpu(current);
-#ifdef CONFIG_ALTIVEC
-	if (regs->msr & MSR_VEC)
-		giveup_altivec(current);
-#endif /* CONFIG_ALTIVEC */
+	flush_fp_to_thread(current);
+	flush_altivec_to_thread(current);
 }
 
 /*
@@ -439,12 +488,8 @@ int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,
 	error = PTR_ERR(filename);
 	if (IS_ERR(filename))
 		goto out;
-	if (regs->msr & MSR_FP)
-		giveup_fpu(current);
-#ifdef CONFIG_ALTIVEC
-	if (regs->msr & MSR_VEC)
-		giveup_altivec(current);
-#endif /* CONFIG_ALTIVEC */
+	flush_fp_to_thread(current);
+	flush_altivec_to_thread(current);
 	error = do_execve(filename, (char __user * __user *) a1,
 				    (char __user * __user *) a2, regs);
   

arch/ppc64/kernel/ptrace.c

@@ -119,8 +119,7 @@ int sys_ptrace(long request, long pid, long addr, long data)
 		if (index < PT_FPR0) {
 			tmp = get_reg(child, (int)index);
 		} else {
-			if (child->thread.regs->msr & MSR_FP)
-				giveup_fpu(child);
+			flush_fp_to_thread(child);
 			tmp = ((unsigned long *)child->thread.fpr)[index - PT_FPR0];
 		}
 		ret = put_user(tmp,(unsigned long __user *) data);
@@ -152,8 +151,7 @@ int sys_ptrace(long request, long pid, long addr, long data)
 		if (index < PT_FPR0) {
 			ret = put_reg(child, index, data);
 		} else {
-			if (child->thread.regs->msr & MSR_FP)
-				giveup_fpu(child);
+			flush_fp_to_thread(child);
 			((unsigned long *)child->thread.fpr)[index - PT_FPR0] = data;
 			ret = 0;
 		}
@@ -245,8 +243,7 @@ int sys_ptrace(long request, long pid, long addr, long data)
 		unsigned long *reg = &((unsigned long *)child->thread.fpr)[0];
 		unsigned long __user *tmp = (unsigned long __user *)addr;
 
-		if (child->thread.regs->msr & MSR_FP)
-			giveup_fpu(child);
+		flush_fp_to_thread(child);
 
 		for (i = 0; i < 32; i++) {
 			ret = put_user(*reg, tmp);
@@ -263,8 +260,7 @@ int sys_ptrace(long request, long pid, long addr, long data)
 		unsigned long *reg = &((unsigned long *)child->thread.fpr)[0];
 		unsigned long __user *tmp = (unsigned long __user *)addr;
 
-		if (child->thread.regs->msr & MSR_FP)
-			giveup_fpu(child);
+		flush_fp_to_thread(child);
 
 		for (i = 0; i < 32; i++) {
 			ret = get_user(*reg, tmp);

arch/ppc64/kernel/ptrace32.c

@@ -136,8 +136,7 @@ int sys32_ptrace(long request, long pid, unsigned long addr, unsigned long data)
 		if (index < PT_FPR0) {
 			tmp = get_reg(child, index);
 		} else {
-			if (child->thread.regs->msr & MSR_FP)
-				giveup_fpu(child);
+			flush_fp_to_thread(child);
 			/*
 			 * the user space code considers the floating point
 			 * to be an array of unsigned int (32 bits) - the
@@ -179,8 +178,7 @@ int sys32_ptrace(long request, long pid, unsigned long addr, unsigned long data)
 			break;
 
 		if (numReg >= PT_FPR0) {
-			if (child->thread.regs->msr & MSR_FP)
-				giveup_fpu(child);
+			flush_fp_to_thread(child);
 			tmp = ((unsigned long int *)child->thread.fpr)[numReg - PT_FPR0];
 		} else { /* register within PT_REGS struct */
 			tmp = get_reg(child, numReg);
@@ -244,8 +242,7 @@ int sys32_ptrace(long request, long pid, unsigned long addr, unsigned long data)
 		if (index < PT_FPR0) {
 			ret = put_reg(child, index, data);
 		} else {
-			if (child->thread.regs->msr & MSR_FP)
-				giveup_fpu(child);
+			flush_fp_to_thread(child);
 			/*
 			 * the user space code considers the floating point
 			 * to be an array of unsigned int (32 bits) - the
@@ -283,8 +280,7 @@ int sys32_ptrace(long request, long pid, unsigned long addr, unsigned long data)
 				|| ((numReg > PT_CCR) && (numReg < PT_FPR0)))
 			break;
 		if (numReg >= PT_FPR0) {
-			if (child->thread.regs->msr & MSR_FP)
-				giveup_fpu(child);
+			flush_fp_to_thread(child);
 		}
 		if (numReg == PT_MSR)
 			data = (data & MSR_DEBUGCHANGE)
@@ -379,8 +375,7 @@ int sys32_ptrace(long request, long pid, unsigned long addr, unsigned long data)
 		unsigned long *reg = &((unsigned long *)child->thread.fpr)[0];
 		unsigned int __user *tmp = (unsigned int __user *)addr;
 
-		if (child->thread.regs->msr & MSR_FP)
-			giveup_fpu(child);
+		flush_fp_to_thread(child);
 
 		for (i = 0; i < 32; i++) {
 			ret = put_user(*reg, tmp);
@@ -397,8 +392,7 @@ int sys32_ptrace(long request, long pid, unsigned long addr, unsigned long data)
 		unsigned long *reg = &((unsigned long *)child->thread.fpr)[0];
 		unsigned int __user *tmp = (unsigned int __user *)addr;
 
-		if (child->thread.regs->msr & MSR_FP)
-			giveup_fpu(child);
+		flush_fp_to_thread(child);
 
 		for (i = 0; i < 32; i++) {
 			ret = get_user(*reg, tmp);

arch/ppc64/kernel/rtas.c

@@ -68,10 +68,11 @@ char rtas_data_buf[RTAS_DATA_BUF_SIZE]__page_aligned;
 void
 call_rtas_display_status(char c)
 {
-	struct rtas_args *args = &(get_paca()->xRtas);
+	struct rtas_args *args;
 	unsigned long s;
 
 	spin_lock_irqsave(&rtas.lock, s);
+	args = &(get_paca()->xRtas);
 
 	args->token = 10;
 	args->nargs = 1;
@@ -145,7 +146,7 @@ rtas_call(int token, int nargs, int nret,
 	va_list list;
 	int i, logit = 0;
 	unsigned long s;
-	struct rtas_args *rtas_args = &(get_paca()->xRtas);
+	struct rtas_args *rtas_args;
 	long ret;
 
 	PPCDBG(PPCDBG_RTAS, "Entering rtas_call\n");
@@ -158,6 +159,7 @@ rtas_call(int token, int nargs, int nret,
 
 	/* Gotta do something different here, use global lock for now... */
 	spin_lock_irqsave(&rtas.lock, s);
+	rtas_args = &(get_paca()->xRtas);
 
 	rtas_args->token = token;
 	rtas_args->nargs = nargs;

arch/ppc64/kernel/signal.c

@@ -131,8 +131,7 @@ static long setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
 #endif
 	long err = 0;
 
-	if (regs->msr & MSR_FP)
-		giveup_fpu(current);
+	flush_fp_to_thread(current);
 
 	/* Make sure signal doesn't get spurrious FP exceptions */
 	current->thread.fpscr = 0;
@@ -141,9 +140,8 @@ static long setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
 	err |= __put_user(v_regs, &sc->v_regs);
 
 	/* save altivec registers */
-	if (current->thread.used_vr) {		
-		if (regs->msr & MSR_VEC)
-			giveup_altivec(current);
+	if (current->thread.used_vr) {
+		flush_altivec_to_thread(current);
 		/* Copy 33 vec registers (vr0..31 and vscr) to the stack */
 		err |= __copy_to_user(v_regs, current->thread.vr, 33 * sizeof(vector128));
 		/* set MSR_VEC in the MSR value in the frame to indicate that sc->v_reg)
@@ -530,13 +528,13 @@ int do_signal(sigset_t *oldset, struct pt_regs *regs)
 		struct k_sigaction *ka = &current->sighand->action[signr-1];
 
 		/* Whee!  Actually deliver the signal.  */
-		if (regs->trap == 0x0C00)
+		if (TRAP(regs) == 0x0C00)
 			syscall_restart(regs, ka);
 		handle_signal(signr, ka, &info, oldset, regs);
 		return 1;
 	}
 
-	if (regs->trap == 0x0C00) {	/* System Call! */
+	if (TRAP(regs) == 0x0C00) {	/* System Call! */
 		if ((int)regs->result == -ERESTARTNOHAND ||
 		    (int)regs->result == -ERESTARTSYS ||
 		    (int)regs->result == -ERESTARTNOINTR) {

arch/ppc64/kernel/signal32.c

@@ -130,11 +130,10 @@ static int save_user_regs(struct pt_regs *regs, struct mcontext32 __user *frame,
 {
 	elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
 	int i, err = 0;
-	
-	/* Make sure floating point registers are stored in regs */ 
-	if (regs->msr & MSR_FP)
-		giveup_fpu(current);
-	
+
+	/* Make sure floating point registers are stored in regs */
+	flush_fp_to_thread(current);
+
 	/* save general and floating-point registers */
 	for (i = 0; i <= PT_RESULT; i ++)
 		err |= __put_user((unsigned int)gregs[i], &frame->mc_gregs[i]);
@@ -148,8 +147,7 @@ static int save_user_regs(struct pt_regs *regs, struct mcontext32 __user *frame,
 #ifdef CONFIG_ALTIVEC
 	/* save altivec registers */
 	if (current->thread.used_vr) {
-		if (regs->msr & MSR_VEC)
-			giveup_altivec(current);
+		flush_altivec_to_thread(current);
 		if (__copy_to_user(&frame->mc_vregs, current->thread.vr,
 				   ELF_NVRREG32 * sizeof(vector128)))
 			return 1;
@@ -934,7 +932,7 @@ int do_signal32(sigset_t *oldset, struct pt_regs *regs)
 
 	ka = (signr == 0)? NULL: &current->sighand->action[signr-1];
 
-	if (regs->trap == 0x0C00		/* System Call! */
+	if (TRAP(regs) == 0x0C00		/* System Call! */
 	    && regs->ccr & 0x10000000		/* error signalled */
 	    && ((ret = regs->gpr[3]) == ERESTARTSYS
 		|| ret == ERESTARTNOHAND || ret == ERESTARTNOINTR

arch/ppc64/kernel/sys_ppc32.c

@@ -617,12 +617,8 @@ long sys32_execve(unsigned long a0, unsigned long a1, unsigned long a2,
 	error = PTR_ERR(filename);
 	if (IS_ERR(filename))
 		goto out;
-	if (regs->msr & MSR_FP)
-		giveup_fpu(current);
-#ifdef CONFIG_ALTIVEC
-	if (regs->msr & MSR_VEC)
-		giveup_altivec(current);
-#endif /* CONFIG_ALTIVEC */
+	flush_fp_to_thread(current);
+	flush_altivec_to_thread(current);
 
 	error = compat_do_execve(filename, compat_ptr(a1), compat_ptr(a2), regs);
 

arch/ppc64/kernel/syscalls.c

@@ -237,5 +237,19 @@ asmlinkage time_t sys64_time(time_t __user * tloc)
 	return secs;
 }
 
+void do_show_syscall(unsigned long r3, unsigned long r4, unsigned long r5,
+		     unsigned long r6, unsigned long r7, unsigned long r8,
+		     struct pt_regs *regs)
+{
+	printk("syscall %ld(%lx, %lx, %lx, %lx, %lx, %lx) regs=%p current=%p"
+	       " cpu=%d\n", regs->gpr[0], r3, r4, r5, r6, r7, r8, regs,
+	       current, smp_processor_id());
+}
+
+void do_show_syscall_exit(unsigned long r3)
+{
+	printk(" -> %lx, current=%p cpu=%d\n", r3, current, smp_processor_id());
+}
+
 /* Only exists on P-series. */
 cond_syscall(ppc_rtas);

arch/ppc64/kernel/traps.c

@@ -308,8 +308,7 @@ static void parse_fpe(struct pt_regs *regs)
 	siginfo_t info;
 	unsigned long fpscr;
 
-	if (regs->msr & MSR_FP)
-		giveup_fpu(current);
+	flush_fp_to_thread(current);
 
 	fpscr = current->thread.fpscr;
 
@@ -442,8 +441,22 @@ void KernelFPUnavailableException(struct pt_regs *regs)
 	die("Unrecoverable FP Unavailable Exception", regs, SIGABRT);
 }
 
-void KernelAltivecUnavailableException(struct pt_regs *regs)
+void AltivecUnavailableException(struct pt_regs *regs)
 {
+#ifndef CONFIG_ALTIVEC
+	if (user_mode(regs)) {
+		/* A user program has executed an altivec instruction,
+		   but this kernel doesn't support altivec. */
+		siginfo_t info;
+
+		memset(&info, 0, sizeof(info));
+		info.si_signo = SIGILL;
+		info.si_code = ILL_ILLOPC;
+		info.si_addr = (void *) regs->nip;
+		_exception(SIGILL, &info, regs);
+		return;
+	}
+#endif
 	printk(KERN_EMERG "Unrecoverable VMX/Altivec Unavailable Exception "
 			  "%lx at %lx\n", regs->trap, regs->nip);
 	die("Unrecoverable VMX/Altivec Unavailable Exception", regs, SIGABRT);
@@ -531,8 +544,7 @@ AlignmentException(struct pt_regs *regs)
 void
 AltivecAssistException(struct pt_regs *regs)
 {
-	if (regs->msr & MSR_VEC)
-		giveup_altivec(current);
+	flush_altivec_to_thread(current);
 	/* XXX quick hack for now: set the non-Java bit in the VSCR */
 	current->thread.vscr.u[3] |= 0x10000;
 }

arch/ppc64/mm/fault.c

@@ -80,36 +80,45 @@ static int store_updates_sp(struct pt_regs *regs)
  *  - DSISR for a non-SLB data access fault,
  *  - SRR1 & 0x08000000 for a non-SLB instruction access fault
  *  - 0 any SLB fault.
+ * The return value is 0 if the fault was handled, or the signal
+ * number if this is a kernel fault that can't be handled here.
  */
-void do_page_fault(struct pt_regs *regs, unsigned long address,
-		   unsigned long error_code)
+int do_page_fault(struct pt_regs *regs, unsigned long address,
+		  unsigned long error_code)
 {
 	struct vm_area_struct * vma;
 	struct mm_struct *mm = current->mm;
 	siginfo_t info;
 	unsigned long code = SEGV_MAPERR;
 	unsigned long is_write = error_code & 0x02000000;
+	unsigned long trap = TRAP(regs);
 
-	if (regs->trap == 0x300 || regs->trap == 0x380) {
+	if (trap == 0x300 || trap == 0x380) {
 		if (debugger_fault_handler(regs))
-			return;
+			return 0;
 	}
 
 	/* On a kernel SLB miss we can only check for a valid exception entry */
-	if (!user_mode(regs) && (regs->trap == 0x380)) {
-		bad_page_fault(regs, address, SIGSEGV);
-		return;
-	}
+	if (!user_mode(regs) && (trap == 0x380 || address >= TASK_SIZE))
+		return SIGSEGV;
 
 	if (error_code & 0x00400000) {
 		if (debugger_dabr_match(regs))
-			return;
+			return 0;
 	}
 
 	if (in_atomic() || mm == NULL) {
-		bad_page_fault(regs, address, SIGSEGV);
-		return;
+		if (!user_mode(regs))
+			return SIGSEGV;
+		/* in_atomic() in user mode is really bad,
+		   as is current->mm == NULL. */
+		printk(KERN_EMERG "Page fault in user mode with"
+		       "in_atomic() = %d mm = %p\n", in_atomic(), mm);
+		printk(KERN_EMERG "NIP = %lx  MSR = %lx\n",
+		       regs->nip, regs->msr);
+		die("Weird page fault", regs, SIGSEGV);
 	}
+
 	down_read(&mm->mmap_sem);
 	vma = find_vma(mm, address);
 	if (!vma)
@@ -195,7 +204,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
 	}
 
 	up_read(&mm->mmap_sem);
-	return;
+	return 0;
 
 bad_area:
 	up_read(&mm->mmap_sem);
@@ -207,11 +216,10 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
 		info.si_code = code;
 		info.si_addr = (void *) address;
 		force_sig_info(SIGSEGV, &info, current);
-		return;
+		return 0;
 	}
 
-	bad_page_fault(regs, address, SIGSEGV);
-	return;
+	return SIGSEGV;
 
 /*
  * We ran out of memory, or some other thing happened to us that made
@@ -227,18 +235,19 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
 	printk("VM: killing process %s\n", current->comm);
 	if (user_mode(regs))
 		do_exit(SIGKILL);
-	bad_page_fault(regs, address, SIGKILL);
-	return;
+	return SIGKILL;
 
 do_sigbus:
 	up_read(&mm->mmap_sem);
-	info.si_signo = SIGBUS;
-	info.si_errno = 0;
-	info.si_code = BUS_ADRERR;
-	info.si_addr = (void *)address;
-	force_sig_info (SIGBUS, &info, current);
-	if (!user_mode(regs))
-		bad_page_fault(regs, address, SIGBUS);
+	if (user_mode(regs)) {
+		info.si_signo = SIGBUS;
+		info.si_errno = 0;
+		info.si_code = BUS_ADRERR;
+		info.si_addr = (void *)address;
+		force_sig_info(SIGBUS, &info, current);
+		return 0;
+	}
+	return SIGBUS;
 }
 
 /*

arch/ppc64/mm/hash_utils.c

@@ -251,6 +251,7 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
 	struct mm_struct *mm;
 	pte_t *ptep;
 	int ret;
+	int cpu;
 	int user_region = 0;
 	int local = 0;
 	cpumask_t tmp;
@@ -302,7 +303,8 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
 	if (pgdir == NULL)
 		return 1;
 
-	tmp = cpumask_of_cpu(smp_processor_id());
+	cpu = get_cpu();
+	tmp = cpumask_of_cpu(cpu);
 	if (user_region && cpus_equal(mm->cpu_vm_mask, tmp))
 		local = 1;
 
@@ -311,11 +313,13 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
 		ret = hash_huge_page(mm, access, ea, vsid, local);
 	else {
 		ptep = find_linux_pte(pgdir, ea);
-		if (ptep == NULL)
+		if (ptep == NULL) {
+			put_cpu();
 			return 1;
+		}
 		ret = __hash_page(ea, access, vsid, ptep, trap, local);
 	}
-
+	put_cpu();
 
 	return ret;
 }

arch/ppc64/mm/hugetlbpage.c

@@ -375,6 +375,7 @@ void unmap_hugepage_range(struct vm_area_struct *vma,
 	unsigned long addr;
 	hugepte_t *ptep;
 	struct page *page;
+	int cpu;
 	int local = 0;
 	cpumask_t tmp;
 
@@ -383,7 +384,8 @@ void unmap_hugepage_range(struct vm_area_struct *vma,
 	BUG_ON((end % HPAGE_SIZE) != 0);
 
 	/* XXX are there races with checking cpu_vm_mask? - Anton */
-	tmp = cpumask_of_cpu(smp_processor_id());
+	cpu = get_cpu();
+	tmp = cpumask_of_cpu(cpu);
 	if (cpus_equal(vma->vm_mm->cpu_vm_mask, tmp))
 		local = 1;
 
@@ -406,6 +408,7 @@ void unmap_hugepage_range(struct vm_area_struct *vma,
 
 		put_page(page);
 	}
+	put_cpu();
 
 	mm->rss -= (end - start) >> PAGE_SHIFT;
 }

arch/ppc64/mm/init.c

@@ -764,6 +764,7 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long ea,
 	void *pgdir;
 	pte_t *ptep;
 	int local = 0;
+	int cpu;
 	cpumask_t tmp;
 
 	/* handle i-cache coherency */
@@ -794,12 +795,14 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long ea,
 
 	vsid = get_vsid(vma->vm_mm->context.id, ea);
 
-	tmp = cpumask_of_cpu(smp_processor_id());
+	cpu = get_cpu();
+	tmp = cpumask_of_cpu(cpu);
 	if (cpus_equal(vma->vm_mm->cpu_vm_mask, tmp))
 		local = 1;
 
 	__hash_page(ea, pte_val(pte) & (_PAGE_USER|_PAGE_RW), vsid, ptep,
 		    0x300, local);
+	put_cpu();
 }
 
 void * reserve_phb_iospace(unsigned long size)

arch/ppc64/mm/tlb.c

@@ -91,12 +91,15 @@ void hpte_update(pte_t *ptep, unsigned long pte, int wrprot)
 void __flush_tlb_pending(struct ppc64_tlb_batch *batch)
 {
 	int i;
-	cpumask_t tmp = cpumask_of_cpu(smp_processor_id());
+	int cpu;
+	cpumask_t tmp;
 	int local = 0;
 
 	BUG_ON(in_interrupt());
 
+	cpu = get_cpu();
 	i = batch->index;
+	tmp = cpumask_of_cpu(cpu);
 	if (cpus_equal(batch->mm->cpu_vm_mask, tmp))
 		local = 1;
 
@@ -106,6 +109,7 @@ void __flush_tlb_pending(struct ppc64_tlb_batch *batch)
 	else
 		flush_hash_range(batch->context, i, local);
 	batch->index = 0;
+	put_cpu();
 }
 
 #ifdef CONFIG_SMP

arch/ppc64/xmon/xmon.c

@@ -44,9 +44,6 @@ static int xmon_owner;
 static int xmon_gate;
 #endif /* CONFIG_SMP */
 
-#define TRAP(regs)	((regs)->trap)
-#define FULL_REGS(regs)	1
-
 static unsigned long in_xmon = 0;
 
 static unsigned long adrs;

include/asm-ppc64/hardirq.h

@@ -82,9 +82,11 @@ typedef struct {
 
 #ifdef CONFIG_PREEMPT
 # define in_atomic()	((preempt_count() & ~PREEMPT_ACTIVE) != kernel_locked())
+# define preemptible()	(preempt_count() == 0 && !irqs_disabled())
 # define IRQ_EXIT_OFFSET (HARDIRQ_OFFSET-1)
 #else
 # define in_atomic()	(preempt_count() != 0)
+# define preemptible()	0
 # define IRQ_EXIT_OFFSET HARDIRQ_OFFSET
 #endif
 #define irq_exit()							\

include/asm-ppc64/paca.h

@@ -136,23 +136,21 @@ struct paca_struct {
 	u8  rsvd6[0x500 - 0x8];
 
 /*=====================================================================================
- * CACHE_LINE_31 0x0F00 - 0x0F7F Exception stack
+ * CACHE_LINE_31-32 0x0F00 - 0x0FFF Exception register save areas
  *=====================================================================================
  */
-	u8 exception_stack[N_EXC_STACK*EXC_FRAME_SIZE];
+	u64 exgen[8];		/* used for most interrupts/exceptions */
+	u64 exmc[8];		/* used for machine checks */
+	u64 exslb[8];		/* used for SLB/segment table misses
+				 * on the linear mapping */
+	u64 exdsi[8];		/* used for linear mapping hash table misses */
 
 /*=====================================================================================
- * CACHE_LINE_32 0x0F80 - 0x0FFF Reserved
+ * Page 2 used as a stack when we detect a bad kernel stack pointer,
+ * and early in SMP boots before relocation is enabled.
  *=====================================================================================
  */
-	u8 rsvd7[0x80];                  /* Give the stack some rope ... */
-
-/*=====================================================================================
- * Page 2 Reserved for guard page.  Also used as a stack early in SMP boots before
- *        relocation is enabled.
- *=====================================================================================
- */
-	u8 guard[0x1000];               /* ... and then hang 'em         */ 
+	u8 guard[0x1000];
 };
 
 #endif /* _PPC64_PACA_H */

include/asm-ppc64/ppc_asm.h

@@ -28,6 +28,9 @@
 #define REST_8GPRS(n, base)	REST_4GPRS(n, base); REST_4GPRS(n+4, base)
 #define REST_10GPRS(n, base)	REST_8GPRS(n, base); REST_2GPRS(n+8, base)
 
+#define SAVE_NVGPRS(base)	SAVE_8GPRS(14, base); SAVE_10GPRS(22, base)
+#define REST_NVGPRS(base)	REST_8GPRS(14, base); REST_10GPRS(22, base)
+
 #define SAVE_FPR(n, base)	stfd	n,THREAD_FPR0+8*(n)(base)
 #define SAVE_2FPRS(n, base)	SAVE_FPR(n, base); SAVE_FPR(n+1, base)
 #define SAVE_4FPRS(n, base)	SAVE_2FPRS(n, base); SAVE_2FPRS(n+2, base)
@@ -54,11 +57,6 @@
 #define REST_16VRS(n,b,base)	REST_8VRS(n,b,base); REST_8VRS(n+8,b,base)
 #define REST_32VRS(n,b,base)	REST_16VRS(n,b,base); REST_16VRS(n+16,b,base)
 
-#define CHECKANYINT(ra,rb)			\
-	mfspr	rb,SPRG3;		/* Get Paca address */\
-	ld	ra,PACALPPACA+LPPACAANYINT(rb); /* Get pending interrupt flags */\
-	cmpldi	0,ra,0;
-
 /* Macros to adjust thread priority for Iseries hardware multithreading */
 #define HMT_LOW		or 1,1,1
 #define HMT_MEDIUM	or 2,2,2

include/asm-ppc64/processor.h

@@ -543,8 +543,7 @@ struct thread_struct {
 	double		fpr[32];	/* Complete floating point set */
 	unsigned long	fpscr;		/* Floating point status (plus pad) */
 	unsigned long	fpexc_mode;	/* Floating-point exception mode */
-	unsigned long	saved_msr;	/* Save MSR across signal handlers */
-	unsigned long	saved_softe;	/* Ditto for Soft Enable/Disable */
+	unsigned long	pad[3];		/* was saved_msr, saved_softe */
 #ifdef CONFIG_ALTIVEC
 	/* Complete AltiVec register set */
 	vector128	vr[32] __attribute((aligned(16)));

include/asm-ppc64/ptrace.h

@@ -71,6 +71,18 @@ struct pt_regs32 {
 #define instruction_pointer(regs) ((regs)->nip)
 #define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1)
 
+#define force_successful_syscall_return()   \
+		(current_thread_info()->syscall_noerror = 1)
+
+/*
+ * We use the least-significant bit of the trap field to indicate
+ * whether we have saved the full set of registers, or only a
+ * partial set.  A 1 there means the partial set.
+ */
+#define FULL_REGS(regs)		(((regs)->trap & 1) == 0)
+#define TRAP(regs)		((regs)->trap & ~0xF)
+#define CHECK_FULL_REGS(regs)	BUG_ON(regs->trap & 1)
+
 /*
  * Offsets used by 'ptrace' system call interface.
  */

include/asm-ppc64/system.h

@@ -111,6 +111,8 @@ extern void flush_instruction_cache(void);
 extern int _get_PVR(void);
 extern void giveup_fpu(struct task_struct *);
 extern void disable_kernel_fp(void);
+extern void flush_fp_to_thread(struct task_struct *);
+extern void flush_altivec_to_thread(struct task_struct *);
 extern void enable_kernel_fp(void);
 extern void giveup_altivec(struct task_struct *);
 extern void disable_kernel_altivec(void);

include/asm-ppc64/thread_info.h

@@ -13,6 +13,7 @@
 #ifndef __ASSEMBLY__
 #include <linux/config.h>
 #include <asm/processor.h>
+#include <asm/page.h>
 #include <linux/stringify.h>
 
 /*
@@ -23,8 +24,10 @@ struct thread_info {
 	struct exec_domain *exec_domain;	/* execution domain */
 	unsigned long	flags;			/* low level flags */
 	int		cpu;			/* cpu we're on */
-	int		preempt_count;		/* not used at present */
+	int		preempt_count;
 	struct restart_block restart_block;
+	/* set by force_successful_syscall_return */
+	unsigned char	syscall_noerror;
 };
 
 /*
@@ -73,7 +76,7 @@ struct thread_info {
 static inline struct thread_info *current_thread_info(void)
 {
 	struct thread_info *ti;
-	__asm__("clrrdi %0,1,14" : "=r"(ti));
+	__asm__("clrrdi %0,1,%1" : "=r"(ti) : "i" (THREAD_SHIFT));
 	return ti;
 }