Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6:
  [IA64] kprobe clears qp bits for special instructions
  [IA64] enable trap code on slot 1
  [IA64] Take defensive stance on ia64_pal_get_brand_info()
  [IA64] fix possible XPC deadlock when disconnecting
  [IA64] - Reduce overhead of FP exception logging messages
  [IA64] fix arch/ia64/mm/contig.c:235: warning: unused variable `nid'
  [IA64] s/termios/ktermios/ in simserial.c
  [IA64] kexec/kdump: tidy up declaration of relocate_new_kernel_t
  [IA64] Kexec/Kdump: honour non-zero crashkernel offset.
  [IA64] CONFIG_KEXEC/CONFIG_CRASH_DUMP permutations
  [IA64] Do not call SN_SAL_SET_CPU_NUMBER twice on cpu 0

16 files changed, 358 insertions, 149 deletions

diff --git a/arch/ia64/hp/sim/simserial.c b/arch/ia64/hp/sim/simserial.c
index 1f16ebb9a80..324ea7565e2 100644
--- a/arch/ia64/hp/sim/simserial.c
+++ b/arch/ia64/hp/sim/simserial.c
@@ -488,7 +488,7 @@ static int rs_ioctl(struct tty_struct *tty, struct file * file,
 
 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
 
-static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
+static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
 {
 	unsigned int cflag = tty->termios->c_cflag;
 
diff --git a/arch/ia64/kernel/Makefile b/arch/ia64/kernel/Makefile
index 8ae384eb535..098ee605bf5 100644
--- a/arch/ia64/kernel/Makefile
+++ b/arch/ia64/kernel/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_CPU_FREQ)		+= cpufreq/
 obj-$(CONFIG_IA64_MCA_RECOVERY)	+= mca_recovery.o
 obj-$(CONFIG_KPROBES)		+= kprobes.o jprobes.o
 obj-$(CONFIG_KEXEC)		+= machine_kexec.o relocate_kernel.o crash.o
+obj-$(CONFIG_CRASH_DUMP)	+= crash_dump.o
 obj-$(CONFIG_IA64_UNCACHED_ALLOCATOR)	+= uncached.o
 obj-$(CONFIG_AUDIT)		+= audit.o
 obj-$(CONFIG_PCI_MSI)		+= msi_ia64.o
diff --git a/arch/ia64/kernel/crash.c b/arch/ia64/kernel/crash.c
index 0aabedf95da..bc2f64d7224 100644
--- a/arch/ia64/kernel/crash.c
+++ b/arch/ia64/kernel/crash.c
@@ -19,29 +19,11 @@
 
 #include <asm/kdebug.h>
 #include <asm/mca.h>
-#include <asm/uaccess.h>
 
 int kdump_status[NR_CPUS];
 atomic_t kdump_cpu_freezed;
 atomic_t kdump_in_progress;
 int kdump_on_init = 1;
-ssize_t
-copy_oldmem_page(unsigned long pfn, char *buf,
-		size_t csize, unsigned long offset, int userbuf)
-{
-	void  *vaddr;
-
-	if (!csize)
-		return 0;
-	vaddr = __va(pfn<<PAGE_SHIFT);
-	if (userbuf) {
-		if (copy_to_user(buf, (vaddr + offset), csize)) {
-			return -EFAULT;
-		}
-	} else
-		memcpy(buf, (vaddr + offset), csize);
-	return csize;
-}
 
 static inline Elf64_Word
 *append_elf_note(Elf64_Word *buf, char *name, unsigned type, void *data,
@@ -225,14 +207,10 @@ static ctl_table sys_table[] = {
 static int
 machine_crash_setup(void)
 {
-	char *from = strstr(saved_command_line, "elfcorehdr=");
 	static struct notifier_block kdump_init_notifier_nb = {
 		.notifier_call = kdump_init_notifier,
 	};
 	int ret;
-	if (from)
-		elfcorehdr_addr = memparse(from+11, &from);
-	saved_max_pfn = (unsigned long)-1;
 	if((ret = register_die_notifier(&kdump_init_notifier_nb)) != 0)
 		return ret;
 #ifdef CONFIG_SYSCTL
diff --git a/arch/ia64/kernel/crash_dump.c b/arch/ia64/kernel/crash_dump.c
new file mode 100644
index 00000000000..83b8c91c140
--- /dev/null
+++ b/arch/ia64/kernel/crash_dump.c
@@ -0,0 +1,48 @@
+/*
+ *	kernel/crash_dump.c - Memory preserving reboot related code.
+ *
+ *	Created by: Simon Horman <horms@verge.net.au>
+ *	Original code moved from kernel/crash.c
+ *	Original code comment copied from the i386 version of this file
+ */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+
+#include <linux/uaccess.h>
+
+/**
+ * copy_oldmem_page - copy one page from "oldmem"
+ * @pfn: page frame number to be copied
+ * @buf: target memory address for the copy; this can be in kernel address
+ *	space or user address space (see @userbuf)
+ * @csize: number of bytes to copy
+ * @offset: offset in bytes into the page (based on pfn) to begin the copy
+ * @userbuf: if set, @buf is in user address space, use copy_to_user(),
+ *	otherwise @buf is in kernel address space, use memcpy().
+ *
+ * Copy a page from "oldmem". For this page, there is no pte mapped
+ * in the current kernel. We stitch up a pte, similar to kmap_atomic.
+ *
+ * Calling copy_to_user() in atomic context is not desirable. Hence first
+ * copying the data to a pre-allocated kernel page and then copying to user
+ * space in non-atomic context.
+ */
+ssize_t
+copy_oldmem_page(unsigned long pfn, char *buf,
+		size_t csize, unsigned long offset, int userbuf)
+{
+	void  *vaddr;
+
+	if (!csize)
+		return 0;
+	vaddr = __va(pfn<<PAGE_SHIFT);
+	if (userbuf) {
+		if (copy_to_user(buf, (vaddr + offset), csize)) {
+			return -EFAULT;
+		}
+	} else
+		memcpy(buf, (vaddr + offset), csize);
+	return csize;
+}
+
diff --git a/arch/ia64/kernel/jprobes.S b/arch/ia64/kernel/jprobes.S
index 5cd6226f44f..621630256c4 100644
--- a/arch/ia64/kernel/jprobes.S
+++ b/arch/ia64/kernel/jprobes.S
@@ -45,13 +45,14 @@
  * to the correct location.
  */
 #include <asm/asmmacro.h>
+#include <asm-ia64/break.h>
 
 	/*
 	 * void jprobe_break(void)
 	 */
 	.section .kprobes.text, "ax"
 ENTRY(jprobe_break)
-	break.m 0x80300
+	break.m __IA64_BREAK_JPROBE
 END(jprobe_break)
 
 	/*
diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c
index 76e778951e2..6cb56dd4056 100644
--- a/arch/ia64/kernel/kprobes.c
+++ b/arch/ia64/kernel/kprobes.c
@@ -88,6 +88,7 @@ static void __kprobes update_kprobe_inst_flag(uint template, uint  slot,
 {
 	p->ainsn.inst_flag = 0;
 	p->ainsn.target_br_reg = 0;
+	p->ainsn.slot = slot;
 
 	/* Check for Break instruction
 	 * Bits 37:40 Major opcode to be zero
@@ -129,48 +130,6 @@ static void __kprobes update_kprobe_inst_flag(uint template, uint  slot,
 
 /*
  * In this function we check to see if the instruction
- * on which we are inserting kprobe is supported.
- * Returns 0 if supported
- * Returns -EINVAL if unsupported
- */
-static int __kprobes unsupported_inst(uint template, uint  slot,
-				      uint major_opcode,
-				      unsigned long kprobe_inst,
-				      unsigned long addr)
-{
-	if (bundle_encoding[template][slot] == I) {
-		switch (major_opcode) {
-			case 0x0: //I_UNIT_MISC_OPCODE:
-			/*
-			 * Check for Integer speculation instruction
-			 * - Bit 33-35 to be equal to 0x1
-			 */
-			if (((kprobe_inst >> 33) & 0x7) == 1) {
-				printk(KERN_WARNING
-					"Kprobes on speculation inst at <0x%lx> not supported\n",
-					addr);
-				return -EINVAL;
-			}
-
-			/*
-			 * IP relative mov instruction
-			 *  - Bit 27-35 to be equal to 0x30
-			 */
-			if (((kprobe_inst >> 27) & 0x1FF) == 0x30) {
-				printk(KERN_WARNING
-					"Kprobes on \"mov r1=ip\" at <0x%lx> not supported\n",
-					addr);
-				return -EINVAL;
-
-			}
-		}
-	}
-	return 0;
-}
-
-
-/*
- * In this function we check to see if the instruction
  * (qp) cmpx.crel.ctype p1,p2=r2,r3
  * on which we are inserting kprobe is cmp instruction
  * with ctype as unc.
@@ -206,26 +165,136 @@ out:
 }
 
 /*
+ * In this function we check to see if the instruction
+ * on which we are inserting kprobe is supported.
+ * Returns qp value if supported
+ * Returns -EINVAL if unsupported
+ */
+static int __kprobes unsupported_inst(uint template, uint  slot,
+				      uint major_opcode,
+				      unsigned long kprobe_inst,
+				      unsigned long addr)
+{
+	int qp;
+
+	qp = kprobe_inst & 0x3f;
+	if (is_cmp_ctype_unc_inst(template, slot, major_opcode, kprobe_inst)) {
+		if (slot == 1 && qp)  {
+			printk(KERN_WARNING "Kprobes on cmp unc"
+					"instruction on slot 1 at <0x%lx>"
+					"is not supported\n", addr);
+			return -EINVAL;
+
+		}
+		qp = 0;
+	}
+	else if (bundle_encoding[template][slot] == I) {
+		if (major_opcode == 0) {
+			/*
+			 * Check for Integer speculation instruction
+			 * - Bit 33-35 to be equal to 0x1
+			 */
+			if (((kprobe_inst >> 33) & 0x7) == 1) {
+				printk(KERN_WARNING
+					"Kprobes on speculation inst at <0x%lx> not supported\n",
+						addr);
+				return -EINVAL;
+			}
+			/*
+			 * IP relative mov instruction
+			 *  - Bit 27-35 to be equal to 0x30
+			 */
+			if (((kprobe_inst >> 27) & 0x1FF) == 0x30) {
+				printk(KERN_WARNING
+					"Kprobes on \"mov r1=ip\" at <0x%lx> not supported\n",
+						addr);
+				return -EINVAL;
+
+			}
+		}
+		else if ((major_opcode == 5) &&	!(kprobe_inst & (0xFUl << 33)) &&
+				(kprobe_inst & (0x1UL << 12))) {
+			/* test bit instructions, tbit,tnat,tf
+			 * bit 33-36 to be equal to 0
+			 * bit 12 to be equal to 1
+			 */
+			if (slot == 1 && qp) {
+				printk(KERN_WARNING "Kprobes on test bit"
+						"instruction on slot at <0x%lx>"
+						"is not supported\n", addr);
+				return -EINVAL;
+			}
+			qp = 0;
+		}
+	}
+	else if (bundle_encoding[template][slot] == B) {
+		if (major_opcode == 7) {
+			/* IP-Relative Predict major code is 7 */
+			printk(KERN_WARNING "Kprobes on IP-Relative"
+					"Predict is not supported\n");
+			return -EINVAL;
+		}
+		else if (major_opcode == 2) {
+			/* Indirect Predict, major code is 2
+			 * bit 27-32 to be equal to 10 or 11
+			 */
+			int x6=(kprobe_inst >> 27) & 0x3F;
+			if ((x6 == 0x10) || (x6 == 0x11)) {
+				printk(KERN_WARNING "Kprobes on"
+					"Indirect Predict is not supported\n");
+				return -EINVAL;
+			}
+		}
+	}
+	/* kernel does not use float instruction, here for safety kprobe
+	 * will judge whether it is fcmp/flass/float approximation instruction
+	 */
+	else if (unlikely(bundle_encoding[template][slot] == F)) {
+		if ((major_opcode == 4 || major_opcode == 5) &&
+				(kprobe_inst  & (0x1 << 12))) {
+			/* fcmp/fclass unc instruction */
+			if (slot == 1 && qp) {
+				printk(KERN_WARNING "Kprobes on fcmp/fclass "
+					"instruction on slot at <0x%lx> "
+					"is not supported\n", addr);
+				return -EINVAL;
+
+			}
+			qp = 0;
+		}
+		if ((major_opcode == 0 || major_opcode == 1) &&
+			(kprobe_inst & (0x1UL << 33))) {
+			/* float Approximation instruction */
+			if (slot == 1 && qp) {
+				printk(KERN_WARNING "Kprobes on float Approx "
+					"instr at <0x%lx> is not supported\n",
+						addr);
+				return -EINVAL;
+			}
+			qp = 0;
+		}
+	}
+	return qp;
+}
+
+/*
  * In this function we override the bundle with
  * the break instruction at the given slot.
  */
 static void __kprobes prepare_break_inst(uint template, uint  slot,
 					 uint major_opcode,
 					 unsigned long kprobe_inst,
-					 struct kprobe *p)
+					 struct kprobe *p,
+					 int qp)
 {
 	unsigned long break_inst = BREAK_INST;
 	bundle_t *bundle = &p->opcode.bundle;
 
 	/*
 	 * Copy the original kprobe_inst qualifying predicate(qp)
-	 * to the break instruction iff !is_cmp_ctype_unc_inst
-	 * because for cmp instruction with ctype equal to unc,
-	 * which is a special instruction always needs to be
-	 * executed regradless of qp
+	 * to the break instruction
 	 */
-	if (!is_cmp_ctype_unc_inst(template, slot, major_opcode, kprobe_inst))
-		break_inst |= (0x3f & kprobe_inst);
+	break_inst |= qp;
 
 	switch (slot) {
 	  case 0:
@@ -296,12 +365,6 @@ static int __kprobes valid_kprobe_addr(int template, int slot,
 		return -EINVAL;
 	}
 
-	if (slot == 1 && bundle_encoding[template][1] != L) {
-		printk(KERN_WARNING "Inserting kprobes on slot #1 "
-		       "is not supported\n");
-		return -EINVAL;
-	}
-
 	return 0;
 }
 
@@ -427,6 +490,7 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p)
 	unsigned long kprobe_inst=0;
 	unsigned int slot = addr & 0xf, template, major_opcode = 0;
 	bundle_t *bundle;
+	int qp;
 
 	bundle = &((kprobe_opcode_t *)kprobe_addr)->bundle;
 	template = bundle->quad0.template;
@@ -441,9 +505,9 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p)
 	/* Get kprobe_inst and major_opcode from the bundle */
 	get_kprobe_inst(bundle, slot, &kprobe_inst, &major_opcode);
 
-	if (unsupported_inst(template, slot, major_opcode, kprobe_inst, addr))
-			return -EINVAL;
-
+	qp = unsupported_inst(template, slot, major_opcode, kprobe_inst, addr);
+	if (qp < 0)
+		return -EINVAL;
 
 	p->ainsn.insn = get_insn_slot();
 	if (!p->ainsn.insn)
@@ -451,30 +515,56 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p)
 	memcpy(&p->opcode, kprobe_addr, sizeof(kprobe_opcode_t));
 	memcpy(p->ainsn.insn, kprobe_addr, sizeof(kprobe_opcode_t));
 
-	prepare_break_inst(template, slot, major_opcode, kprobe_inst, p);
+	prepare_break_inst(template, slot, major_opcode, kprobe_inst, p, qp);
 
 	return 0;
 }
 
 void __kprobes arch_arm_kprobe(struct kprobe *p)
 {
-	unsigned long addr = (unsigned long)p->addr;
-	unsigned long arm_addr = addr & ~0xFULL;
+	unsigned long arm_addr;
+	bundle_t *src, *dest;
+
+	arm_addr = ((unsigned long)p->addr) & ~0xFUL;
+	dest = &((kprobe_opcode_t *)arm_addr)->bundle;
+	src = &p->opcode.bundle;
 
 	flush_icache_range((unsigned long)p->ainsn.insn,
 			(unsigned long)p->ainsn.insn + sizeof(kprobe_opcode_t));
-	memcpy((char *)arm_addr, &p->opcode, sizeof(kprobe_opcode_t));
+	switch (p->ainsn.slot) {
+		case 0:
+			dest->quad0.slot0 = src->quad0.slot0;
+			break;
+		case 1:
+			dest->quad1.slot1_p1 = src->quad1.slot1_p1;
+			break;
+		case 2:
+			dest->quad1.slot2 = src->quad1.slot2;
+			break;
+	}
 	flush_icache_range(arm_addr, arm_addr + sizeof(kprobe_opcode_t));
 }
 
 void __kprobes arch_disarm_kprobe(struct kprobe *p)
 {
-	unsigned long addr = (unsigned long)p->addr;
-	unsigned long arm_addr = addr & ~0xFULL;
+	unsigned long arm_addr;
+	bundle_t *src, *dest;
 
+	arm_addr = ((unsigned long)p->addr) & ~0xFUL;
+	dest = &((kprobe_opcode_t *)arm_addr)->bundle;
 	/* p->ainsn.insn contains the original unaltered kprobe_opcode_t */
-	memcpy((char *) arm_addr, (char *) p->ainsn.insn,
-					 sizeof(kprobe_opcode_t));
+	src = &p->ainsn.insn->bundle;
+	switch (p->ainsn.slot) {
+		case 0:
+			dest->quad0.slot0 = src->quad0.slot0;
+			break;
+		case 1:
+			dest->quad1.slot1_p1 = src->quad1.slot1_p1;
+			break;
+		case 2:
+			dest->quad1.slot2 = src->quad1.slot2;
+			break;
+	}
 	flush_icache_range(arm_addr, arm_addr + sizeof(kprobe_opcode_t));
 }
 
@@ -807,7 +897,9 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
 	switch(val) {
 	case DIE_BREAK:
 		/* err is break number from ia64_bad_break() */
-		if (args->err == 0x80200 || args->err == 0x80300 || args->err == 0)
+		if ((args->err >> 12) == (__IA64_BREAK_KPROBE >> 12)
+			|| args->err == __IA64_BREAK_JPROBE
+			|| args->err == 0)
 			if (pre_kprobes_handler(args))
 				ret = NOTIFY_STOP;
 		break;
diff --git a/arch/ia64/kernel/machine_kexec.c b/arch/ia64/kernel/machine_kexec.c
index 468233fa2ce..e2ccc9f660c 100644
--- a/arch/ia64/kernel/machine_kexec.c
+++ b/arch/ia64/kernel/machine_kexec.c
@@ -19,8 +19,11 @@
 #include <asm/delay.h>
 #include <asm/meminit.h>
 
-typedef void (*relocate_new_kernel_t)(unsigned long, unsigned long,
-		struct ia64_boot_param *, unsigned long);
+typedef NORET_TYPE void (*relocate_new_kernel_t)(
+					unsigned long indirection_page,
+					unsigned long start_address,
+					struct ia64_boot_param *boot_param,
+					unsigned long pal_addr) ATTRIB_NORET;
 
 struct kimage *ia64_kimage;
 
diff --git a/arch/ia64/kernel/mca.c b/arch/ia64/kernel/mca.c
index 87c1c4f4287..a76add3e76a 100644
--- a/arch/ia64/kernel/mca.c
+++ b/arch/ia64/kernel/mca.c
@@ -1239,7 +1239,7 @@ ia64_mca_handler(struct pt_regs *regs, struct switch_stack *sw,
 	} else {
 		/* Dump buffered message to console */
 		ia64_mlogbuf_finish(1);
-#ifdef CONFIG_CRASH_DUMP
+#ifdef CONFIG_KEXEC
 		atomic_set(&kdump_in_progress, 1);
 		monarch_cpu = -1;
 #endif
diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index 14e1200376a..ad567b8d432 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -256,7 +256,7 @@ reserve_memory (void)
 
 #ifdef CONFIG_KEXEC
 	/* crashkernel=size@offset specifies the size to reserve for a crash
-	 * kernel.(offset is ingored for keep compatibility with other archs)
+	 * kernel. If offset is 0, then it is determined automatically.
 	 * By reserving this memory we guarantee that linux never set's it
 	 * up as a DMA target.Useful for holding code to do something
 	 * appropriate after a kernel panic.
@@ -266,10 +266,16 @@ reserve_memory (void)
 		unsigned long base, size;
 		if (from) {
 			size = memparse(from + 12, &from);
+			if (*from == '@')
+				base = memparse(from+1, &from);
+			else
+				base = 0;
 			if (size) {
-				sort_regions(rsvd_region, n);
-				base = kdump_find_rsvd_region(size,
-				rsvd_region, n);
+				if (!base) {
+					sort_regions(rsvd_region, n);
+					base = kdump_find_rsvd_region(size,
+							      	rsvd_region, n);
+					}
 				if (base != ~0UL) {
 					rsvd_region[n].start =
 						(unsigned long)__va(base);
@@ -434,6 +440,21 @@ static __init int setup_nomca(char *s)
 }
 early_param("nomca", setup_nomca);
 
+#ifdef CONFIG_PROC_VMCORE
+/* elfcorehdr= specifies the location of elf core header
+ * stored by the crashed kernel.
+ */
+static int __init parse_elfcorehdr(char *arg)
+{
+	if (!arg)
+		return -EINVAL;
+
+        elfcorehdr_addr = memparse(arg, &arg);
+	return 0;
+}
+early_param("elfcorehdr", parse_elfcorehdr);
+#endif /* CONFIG_PROC_VMCORE */
+
 void __init
 setup_arch (char **cmdline_p)
 {
@@ -653,6 +674,7 @@ get_model_name(__u8 family, __u8 model)
 {
 	char brand[128];
 
+	memcpy(brand, "Unknown", 8);
 	if (ia64_pal_get_brand_info(brand)) {
 		if (family == 0x7)
 			memcpy(brand, "Merced", 7);
@@ -660,8 +682,7 @@ get_model_name(__u8 family, __u8 model)
 			case 0: memcpy(brand, "McKinley", 9); break;
 			case 1: memcpy(brand, "Madison", 8); break;
 			case 2: memcpy(brand, "Madison up to 9M cache", 23); break;
-		} else
-			memcpy(brand, "Unknown", 8);
+		}
 	}
 	if (brandname[0] == '\0')
 		return strcpy(brandname, brand);
diff --git a/arch/ia64/kernel/smp.c b/arch/ia64/kernel/smp.c
index b1b9aa4364b..f4c7f7769cf 100644
--- a/arch/ia64/kernel/smp.c
+++ b/arch/ia64/kernel/smp.c
@@ -157,7 +157,7 @@ handle_IPI (int irq, void *dev_id)
 			      case IPI_CPU_STOP:
 				stop_this_cpu();
 				break;
-#ifdef CONFIG_CRASH_DUMP
+#ifdef CONFIG_KEXEC
 			      case IPI_KDUMP_CPU_STOP:
 				unw_init_running(kdump_cpu_freeze, NULL);
 				break;
@@ -219,7 +219,7 @@ send_IPI_self (int op)
 	send_IPI_single(smp_processor_id(), op);
 }
 
-#ifdef CONFIG_CRASH_DUMP
+#ifdef CONFIG_KEXEC
 void
 kdump_smp_send_stop()
 {
diff --git a/arch/ia64/kernel/traps.c b/arch/ia64/kernel/traps.c
index fffa9e0826b..ab684747036 100644
--- a/arch/ia64/kernel/traps.c
+++ b/arch/ia64/kernel/traps.c
@@ -307,6 +307,15 @@ fp_emulate (int fp_fault, void *bundle, long *ipsr, long *fpsr, long *isr, long
 	return ret.status;
 }
 
+struct fpu_swa_msg {
+	unsigned long count;
+	unsigned long time;
+};
+static DEFINE_PER_CPU(struct fpu_swa_msg, cpulast);
+DECLARE_PER_CPU(struct fpu_swa_msg, cpulast);
+static struct fpu_swa_msg last __cacheline_aligned;
+
+
 /*
  * Handle floating-point assist faults and traps.
  */
@@ -316,8 +325,6 @@ handle_fpu_swa (int fp_fault, struct pt_regs *regs, unsigned long isr)
 	long exception, bundle[2];
 	unsigned long fault_ip;
 	struct siginfo siginfo;
-	static int fpu_swa_count = 0;
-	static unsigned long last_time;
 
 	fault_ip = regs->cr_iip;
 	if (!fp_fault && (ia64_psr(regs)->ri == 0))
@@ -325,14 +332,37 @@ handle_fpu_swa (int fp_fault, struct pt_regs *regs, unsigned long isr)
 	if (copy_from_user(bundle, (void __user *) fault_ip, sizeof(bundle)))
 		return -1;
 
-	if (jiffies - last_time > 5*HZ)
-		fpu_swa_count = 0;
-	if ((fpu_swa_count < 4) && !(current->thread.flags & IA64_THREAD_FPEMU_NOPRINT)) {
-		last_time = jiffies;
-		++fpu_swa_count;
-		printk(KERN_WARNING
-		       "%s(%d): floating-point assist fault at ip %016lx, isr %016lx\n",
-		       current->comm, current->pid, regs->cr_iip + ia64_psr(regs)->ri, isr);
+	if (!(current->thread.flags & IA64_THREAD_FPEMU_NOPRINT))  {
+		unsigned long count, current_jiffies = jiffies;
+		struct fpu_swa_msg *cp = &__get_cpu_var(cpulast);
+
+		if (unlikely(current_jiffies > cp->time))
+			cp->count = 0;
+		if (unlikely(cp->count < 5)) {
+			cp->count++;
+			cp->time = current_jiffies + 5 * HZ;
+
+			/* minimize races by grabbing a copy of count BEFORE checking last.time. */
+			count = last.count;
+			barrier();
+
+			/*
+			 * Lower 4 bits are used as a count. Upper bits are a sequence
+			 * number that is updated when count is reset. The cmpxchg will
+			 * fail is seqno has changed. This minimizes mutiple cpus
+			 * reseting the count.
+			 */
+			if (current_jiffies > last.time)
+				(void) cmpxchg_acq(&last.count, count, 16 + (count & ~15));
+
+			/* used fetchadd to atomically update the count */
+			if ((last.count & 15) < 5 && (ia64_fetchadd(1, &last.count, acq) & 15) < 5) {
+				last.time = current_jiffies + 5 * HZ;
+				printk(KERN_WARNING
+		       			"%s(%d): floating-point assist fault at ip %016lx, isr %016lx\n",
+		       			current->comm, current->pid, regs->cr_iip + ia64_psr(regs)->ri, isr);
+			}
+		}
 	}
 
 	exception = fp_emulate(fp_fault, bundle, &regs->cr_ipsr, &regs->ar_fpsr, &isr, &regs->pr,
diff --git a/arch/ia64/mm/contig.c b/arch/ia64/mm/contig.c
index 82deaa3a7c4..1e79551231b 100644
--- a/arch/ia64/mm/contig.c
+++ b/arch/ia64/mm/contig.c
@@ -174,6 +174,12 @@ find_memory (void)
 	reserve_bootmem(bootmap_start, bootmap_size);
 
 	find_initrd();
+
+#ifdef CONFIG_CRASH_DUMP
+	/* If we are doing a crash dump, we still need to know the real mem
+	 * size before original memory map is * reset. */
+	saved_max_pfn = max_pfn;
+#endif
 }
 
 #ifdef CONFIG_SMP
@@ -226,7 +232,6 @@ void __init
 paging_init (void)
 {
 	unsigned long max_dma;
-	unsigned long nid = 0;
 	unsigned long max_zone_pfns[MAX_NR_ZONES];
 
 	num_physpages = 0;
@@ -238,7 +243,7 @@ paging_init (void)
 	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 
 #ifdef CONFIG_VIRTUAL_MEM_MAP
-	efi_memmap_walk(register_active_ranges, &nid);
+	efi_memmap_walk(register_active_ranges, NULL);
 	efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
 	if (max_gap < LARGE_GAP) {
 		vmem_map = (struct page *) 0;
diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index 56dc2024220..1a3d8a2feb9 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -595,14 +595,9 @@ find_largest_hole (u64 start, u64 end, void *arg)
 }
 
 int __init
-register_active_ranges(u64 start, u64 end, void *nid)
+register_active_ranges(u64 start, u64 end, void *arg)
 {
-	BUG_ON(nid == NULL);
-	BUG_ON(*(unsigned long *)nid >= MAX_NUMNODES);
-
-	add_active_range(*(unsigned long *)nid,
-				__pa(start) >> PAGE_SHIFT,
-				__pa(end) >> PAGE_SHIFT);
+	add_active_range(0, __pa(start) >> PAGE_SHIFT, __pa(end) >> PAGE_SHIFT);
 	return 0;
 }
 #endif /* CONFIG_VIRTUAL_MEM_MAP */
diff --git a/arch/ia64/sn/kernel/setup.c b/arch/ia64/sn/kernel/setup.c
index a934ad06942..8571e52c2ef 100644
--- a/arch/ia64/sn/kernel/setup.c
+++ b/arch/ia64/sn/kernel/setup.c
@@ -580,7 +580,7 @@ void __cpuinit sn_cpu_init(void)
 	int slice;
 	int cnode;
 	int i;
-	static int wars_have_been_checked;
+	static int wars_have_been_checked, set_cpu0_number;
 
 	cpuid = smp_processor_id();
 	if (cpuid == 0 && IS_MEDUSA()) {
@@ -605,8 +605,16 @@ void __cpuinit sn_cpu_init(void)
 	/*
 	 * Don't check status. The SAL call is not supported on all PROMs
 	 * but a failure is harmless.
+	 * Architechtuallly, cpu_init is always called twice on cpu 0. We
+	 * should set cpu_number on cpu 0 once.
 	 */
-	(void) ia64_sn_set_cpu_number(cpuid);
+	if (cpuid == 0) {
+		if (!set_cpu0_number) {
+			(void) ia64_sn_set_cpu_number(cpuid);
+			set_cpu0_number = 1;
+		}
+	} else
+		(void) ia64_sn_set_cpu_number(cpuid);
 
 	/*
 	 * The boot cpu makes this call again after platform initialization is
diff --git a/arch/ia64/sn/kernel/xpc_channel.c b/arch/ia64/sn/kernel/xpc_channel.c
index 1f3540826e6..c08db9c2375 100644
--- a/arch/ia64/sn/kernel/xpc_channel.c
+++ b/arch/ia64/sn/kernel/xpc_channel.c
@@ -632,7 +632,7 @@ xpc_process_connect(struct xpc_channel *ch, unsigned long *irq_flags)
 		ch->number, ch->partid);
 
 	spin_unlock_irqrestore(&ch->lock, *irq_flags);
-	xpc_create_kthreads(ch, 1);
+	xpc_create_kthreads(ch, 1, 0);
 	spin_lock_irqsave(&ch->lock, *irq_flags);
 }
 
@@ -754,12 +754,12 @@ xpc_process_disconnect(struct xpc_channel *ch, unsigned long *irq_flags)
 
 	/* make sure all activity has settled down first */
 
-	if (atomic_read(&ch->references) > 0 ||
-			((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) &&
-			!(ch->flags & XPC_C_DISCONNECTINGCALLOUT_MADE))) {
+	if (atomic_read(&ch->kthreads_assigned) > 0 ||
+				atomic_read(&ch->references) > 0) {
 		return;
 	}
-	DBUG_ON(atomic_read(&ch->kthreads_assigned) != 0);
+	DBUG_ON((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) &&
+			!(ch->flags & XPC_C_DISCONNECTINGCALLOUT_MADE));
 
 	if (part->act_state == XPC_P_DEACTIVATING) {
 		/* can't proceed until the other side disengages from us */
@@ -1651,6 +1651,11 @@ xpc_disconnect_channel(const int line, struct xpc_channel *ch,
 	/* wake all idle kthreads so they can exit */
 	if (atomic_read(&ch->kthreads_idle) > 0) {
 		wake_up_all(&ch->idle_wq);
+
+	} else if ((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) &&
+			!(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) {
+		/* start a kthread that will do the xpcDisconnecting callout */
+		xpc_create_kthreads(ch, 1, 1);
 	}
 
 	/* wake those waiting to allocate an entry from the local msg queue */
diff --git a/arch/ia64/sn/kernel/xpc_main.c b/arch/ia64/sn/kernel/xpc_main.c
index fa96dfc0e1a..7a387d23736 100644
--- a/arch/ia64/sn/kernel/xpc_main.c
+++ b/arch/ia64/sn/kernel/xpc_main.c
@@ -681,7 +681,7 @@ xpc_activate_kthreads(struct xpc_channel *ch, int needed)
 	dev_dbg(xpc_chan, "create %d new kthreads, partid=%d, channel=%d\n",
 		needed, ch->partid, ch->number);
 
-	xpc_create_kthreads(ch, needed);
+	xpc_create_kthreads(ch, needed, 0);
 }
 
 
@@ -775,26 +775,28 @@ xpc_daemonize_kthread(void *args)
 		xpc_kthread_waitmsgs(part, ch);
 	}
 
-	if (atomic_dec_return(&ch->kthreads_assigned) == 0) {
-		spin_lock_irqsave(&ch->lock, irq_flags);
-		if ((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) &&
-				!(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) {
-			ch->flags |= XPC_C_DISCONNECTINGCALLOUT;
-			spin_unlock_irqrestore(&ch->lock, irq_flags);
+	/* let registerer know that connection is disconnecting */
 
-			xpc_disconnect_callout(ch, xpcDisconnecting);
-
-			spin_lock_irqsave(&ch->lock, irq_flags);
-			ch->flags |= XPC_C_DISCONNECTINGCALLOUT_MADE;
-		}
+	spin_lock_irqsave(&ch->lock, irq_flags);
+	if ((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) &&
+			!(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) {
+		ch->flags |= XPC_C_DISCONNECTINGCALLOUT;
 		spin_unlock_irqrestore(&ch->lock, irq_flags);
+
+		xpc_disconnect_callout(ch, xpcDisconnecting);
+
+		spin_lock_irqsave(&ch->lock, irq_flags);
+		ch->flags |= XPC_C_DISCONNECTINGCALLOUT_MADE;
+	}
+	spin_unlock_irqrestore(&ch->lock, irq_flags);
+
+	if (atomic_dec_return(&ch->kthreads_assigned) == 0) {
 		if (atomic_dec_return(&part->nchannels_engaged) == 0) {
 			xpc_mark_partition_disengaged(part);
 			xpc_IPI_send_disengage(part);
 		}
 	}
 
-
 	xpc_msgqueue_deref(ch);
 
 	dev_dbg(xpc_chan, "kthread exiting, partid=%d, channel=%d\n",
@@ -818,7 +820,8 @@ xpc_daemonize_kthread(void *args)
  * partition.
  */
 void
-xpc_create_kthreads(struct xpc_channel *ch, int needed)
+xpc_create_kthreads(struct xpc_channel *ch, int needed,
+			int ignore_disconnecting)
 {
 	unsigned long irq_flags;
 	pid_t pid;
@@ -833,16 +836,38 @@ xpc_create_kthreads(struct xpc_channel *ch, int needed)
 		 * kthread. That kthread is responsible for doing the
 		 * counterpart to the following before it exits.
 		 */
+		if (ignore_disconnecting) {
+			if (!atomic_inc_not_zero(&ch->kthreads_assigned)) {
+				/* kthreads assigned had gone to zero */
+				BUG_ON(!(ch->flags &
+					XPC_C_DISCONNECTINGCALLOUT_MADE));
+				break;
+			}
+
+		} else if (ch->flags & XPC_C_DISCONNECTING) {
+			break;
+
+		} else if (atomic_inc_return(&ch->kthreads_assigned) == 1) {
+			if (atomic_inc_return(&part->nchannels_engaged) == 1)
+				xpc_mark_partition_engaged(part);
+		}
 		(void) xpc_part_ref(part);
 		xpc_msgqueue_ref(ch);
-		if (atomic_inc_return(&ch->kthreads_assigned) == 1 &&
-		    atomic_inc_return(&part->nchannels_engaged) == 1) {
-			xpc_mark_partition_engaged(part);
-		}
 
 		pid = kernel_thread(xpc_daemonize_kthread, (void *) args, 0);
 		if (pid < 0) {
 			/* the fork failed */
+
+			/*
+			 * NOTE: if (ignore_disconnecting &&
+			 * !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) is true,
+			 * then we'll deadlock if all other kthreads assigned
+			 * to this channel are blocked in the channel's
+			 * registerer, because the only thing that will unblock
+			 * them is the xpcDisconnecting callout that this
+			 * failed kernel_thread would have made.
+			 */
+
 			if (atomic_dec_return(&ch->kthreads_assigned) == 0 &&
 			    atomic_dec_return(&part->nchannels_engaged) == 0) {
 				xpc_mark_partition_disengaged(part);
@@ -857,9 +882,6 @@ xpc_create_kthreads(struct xpc_channel *ch, int needed)
 				 * Flag this as an error only if we have an
 				 * insufficient #of kthreads for the channel
 				 * to function.
-				 *
-				 * No xpc_msgqueue_ref() is needed here since
-				 * the channel mgr is doing this.
 				 */
 				spin_lock_irqsave(&ch->lock, irq_flags);
 				XPC_DISCONNECT_CHANNEL(ch, xpcLackOfResources,