Merge branch 'linux-2.6' into for-2.6.24

6 files changed, 49 insertions, 25 deletions

diff --git a/arch/i386/kernel/alternative.c b/arch/i386/kernel/alternative.c
index 9f4ac8b02de..bd72d94e713 100644
--- a/arch/i386/kernel/alternative.c
+++ b/arch/i386/kernel/alternative.c
@@ -445,8 +445,6 @@ void __kprobes text_poke(void *addr, unsigned char *opcode, int len)
 {
 	memcpy(addr, opcode, len);
 	sync_core();
-	/* Not strictly needed, but can speed CPU recovery up. Ignore cross cacheline
-	   case. */
-	if (cpu_has_clflush)
-		asm("clflush (%0) " :: "r" (addr) : "memory");
+	/* Could also do a CLFLUSH here to speed up CPU recovery; but
+	   that causes hangs on some VIA CPUs. */
 }
diff --git a/arch/i386/kernel/cpu/intel_cacheinfo.c b/arch/i386/kernel/cpu/intel_cacheinfo.c
index d5a456d27d8..db6c25aa577 100644
--- a/arch/i386/kernel/cpu/intel_cacheinfo.c
+++ b/arch/i386/kernel/cpu/intel_cacheinfo.c
@@ -515,7 +515,7 @@ static int __cpuinit detect_cache_attributes(unsigned int cpu)
 
 	cpuid4_info[cpu] = kzalloc(
 	    sizeof(struct _cpuid4_info) * num_cache_leaves, GFP_KERNEL);
-	if (unlikely(cpuid4_info[cpu] == NULL))
+	if (cpuid4_info[cpu] == NULL)
 		return -ENOMEM;
 
 	oldmask = current->cpus_allowed;
@@ -748,6 +748,8 @@ static void __cpuinit cache_remove_dev(struct sys_device * sys_dev)
 	unsigned int cpu = sys_dev->id;
 	unsigned long i;
 
+	if (cpuid4_info[cpu] == NULL)
+		return;
 	for (i = 0; i < num_cache_leaves; i++) {
 		cache_remove_shared_cpu_map(cpu, i);
 		kobject_unregister(&(INDEX_KOBJECT_PTR(cpu,i)->kobj));
diff --git a/arch/i386/kernel/cpu/perfctr-watchdog.c b/arch/i386/kernel/cpu/perfctr-watchdog.c
index 4be488e73be..93fecd4b03d 100644
--- a/arch/i386/kernel/cpu/perfctr-watchdog.c
+++ b/arch/i386/kernel/cpu/perfctr-watchdog.c
@@ -263,8 +263,8 @@ static int setup_k7_watchdog(unsigned nmi_hz)
 	unsigned int evntsel;
 	struct nmi_watchdog_ctlblk *wd = &__get_cpu_var(nmi_watchdog_ctlblk);
 
-	perfctr_msr = MSR_K7_PERFCTR0;
-	evntsel_msr = MSR_K7_EVNTSEL0;
+	perfctr_msr = wd_ops->perfctr;
+	evntsel_msr = wd_ops->evntsel;
 
 	wrmsrl(perfctr_msr, 0UL);
 
@@ -343,8 +343,8 @@ static int setup_p6_watchdog(unsigned nmi_hz)
 	unsigned int evntsel;
 	struct nmi_watchdog_ctlblk *wd = &__get_cpu_var(nmi_watchdog_ctlblk);
 
-	perfctr_msr = MSR_P6_PERFCTR0;
-	evntsel_msr = MSR_P6_EVNTSEL0;
+	perfctr_msr = wd_ops->perfctr;
+	evntsel_msr = wd_ops->evntsel;
 
 	/* KVM doesn't implement this MSR */
 	if (wrmsr_safe(perfctr_msr, 0, 0) < 0)
@@ -569,8 +569,8 @@ static int setup_intel_arch_watchdog(unsigned nmi_hz)
 	    (ebx & ARCH_PERFMON_UNHALTED_CORE_CYCLES_PRESENT))
 		return 0;
 
-	perfctr_msr = MSR_ARCH_PERFMON_PERFCTR1;
-	evntsel_msr = MSR_ARCH_PERFMON_EVENTSEL1;
+	perfctr_msr = wd_ops->perfctr;
+	evntsel_msr = wd_ops->evntsel;
 
 	wrmsrl(perfctr_msr, 0UL);
 
@@ -605,6 +605,16 @@ static struct wd_ops intel_arch_wd_ops = {
 	.evntsel = MSR_ARCH_PERFMON_EVENTSEL1,
 };
 
+static struct wd_ops coreduo_wd_ops = {
+	.reserve = single_msr_reserve,
+	.unreserve = single_msr_unreserve,
+	.setup = setup_intel_arch_watchdog,
+	.rearm = p6_rearm,
+	.stop = single_msr_stop_watchdog,
+	.perfctr = MSR_ARCH_PERFMON_PERFCTR0,
+	.evntsel = MSR_ARCH_PERFMON_EVENTSEL0,
+};
+
 static void probe_nmi_watchdog(void)
 {
 	switch (boot_cpu_data.x86_vendor) {
@@ -615,6 +625,12 @@ static void probe_nmi_watchdog(void)
 		wd_ops = &k7_wd_ops;
 		break;
 	case X86_VENDOR_INTEL:
+		/* Work around Core Duo (Yonah) errata AE49 where perfctr1
+		   doesn't have a working enable bit. */
+		if (boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model == 14) {
+			wd_ops = &coreduo_wd_ops;
+			break;
+		}
 		if (cpu_has(&boot_cpu_data, X86_FEATURE_ARCH_PERFMON)) {
 			wd_ops = &intel_arch_wd_ops;
 			break;
diff --git a/arch/i386/kernel/nmi.c b/arch/i386/kernel/nmi.c
index 8c1c965eb2a..c7227e2180f 100644
--- a/arch/i386/kernel/nmi.c
+++ b/arch/i386/kernel/nmi.c
@@ -115,12 +115,12 @@ static int __init check_nmi_watchdog(void)
 			atomic_dec(&nmi_active);
 		}
 	}
+	endflag = 1;
 	if (!atomic_read(&nmi_active)) {
 		kfree(prev_nmi_count);
 		atomic_set(&nmi_active, -1);
 		return -1;
 	}
-	endflag = 1;
 	printk("OK.\n");
 
 	/* now that we know it works we can reduce NMI frequency to
diff --git a/arch/i386/kernel/ptrace.c b/arch/i386/kernel/ptrace.c
index 0c8f00e69c4..7c1b92522e9 100644
--- a/arch/i386/kernel/ptrace.c
+++ b/arch/i386/kernel/ptrace.c
@@ -274,7 +274,6 @@ static void clear_singlestep(struct task_struct *child)
 void ptrace_disable(struct task_struct *child)
 { 
 	clear_singlestep(child);
-	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 	clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
 }
 
diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index cfffe3dd9e8..47b0bef335b 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -100,36 +100,45 @@ asmlinkage void machine_check(void);
 int kstack_depth_to_print = 24;
 static unsigned int code_bytes = 64;
 
-static inline int valid_stack_ptr(struct thread_info *tinfo, void *p)
+static inline int valid_stack_ptr(struct thread_info *tinfo, void *p, unsigned size)
 {
 	return	p > (void *)tinfo &&
-		p < (void *)tinfo + THREAD_SIZE - 3;
+		p <= (void *)tinfo + THREAD_SIZE - size;
 }
 
+/* The form of the top of the frame on the stack */
+struct stack_frame {
+	struct stack_frame *next_frame;
+	unsigned long return_address;
+};
+
 static inline unsigned long print_context_stack(struct thread_info *tinfo,
 				unsigned long *stack, unsigned long ebp,
 				struct stacktrace_ops *ops, void *data)
 {
-	unsigned long addr;
-
 #ifdef	CONFIG_FRAME_POINTER
-	while (valid_stack_ptr(tinfo, (void *)ebp)) {
-		unsigned long new_ebp;
-		addr = *(unsigned long *)(ebp + 4);
+	struct stack_frame *frame = (struct stack_frame *)ebp;
+	while (valid_stack_ptr(tinfo, frame, sizeof(*frame))) {
+		struct stack_frame *next;
+		unsigned long addr;
+
+		addr = frame->return_address;
 		ops->address(data, addr);
 		/*
 		 * break out of recursive entries (such as
 		 * end_of_stack_stop_unwind_function). Also,
 		 * we can never allow a frame pointer to
 		 * move downwards!
-	 	 */
-	 	new_ebp = *(unsigned long *)ebp;
-		if (new_ebp <= ebp)
+		 */
+		next = frame->next_frame;
+		if (next <= frame)
 			break;
-		ebp = new_ebp;
+		frame = next;
 	}
 #else
-	while (valid_stack_ptr(tinfo, stack)) {
+	while (valid_stack_ptr(tinfo, stack, sizeof(*stack))) {
+		unsigned long addr;
+
 		addr = *stack++;
 		if (__kernel_text_address(addr))
 			ops->address(data, addr);