Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/g…

…it/aegl/linux-2.6

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6:
  [IA64-SGI] SN2-XP reduce kmalloc wrapper inlining
  [IA64] MCA: remove obsolete ifdef
  [IA64] MCA: update MCA comm field for user space tasks
  [IA64] MCA: print messages in MCA handler
  [IA64-SGI] - Eliminate SN pio_phys_xxx macros. Move to assembly
  [IA64] use icc defined constant
  [IA64] add __builtin_trap definition for icc build
  [IA64] clean up asm/intel_intrin.h
  [IA64] map ia64_hint definition to intel compiler intrinsic
  [IA64] hooks to wait for mmio writes to drain when migrating processes
  [IA64-SGI] driver bugfixes and hardware workarounds for CE1.0 asic
  [IA64-SGI] Handle SC env. powerdown events
  [IA64] Delete MCA/INIT sigdelayed code
  [IA64-SGI] sem2mutex ioc4.c
  [IA64] implement ia64 specific mutex primitives
  [IA64] Fix UP build with BSP removal support.
  [IA64] support for cpu0 removal

arch/ia64/Kconfig

@@ -271,6 +271,25 @@ config SCHED_SMT
 	  Intel IA64 chips with MultiThreading at a cost of slightly increased
 	  overhead in some places. If unsure say N here.
 
+config PERMIT_BSP_REMOVE
+	bool "Support removal of Bootstrap Processor"
+	depends on HOTPLUG_CPU
+	default n
+	---help---
+	Say Y here if your platform SAL will support removal of BSP with HOTPLUG_CPU
+	support. 
+
+config FORCE_CPEI_RETARGET
+	bool "Force assumption that CPEI can be re-targetted"
+	depends on PERMIT_BSP_REMOVE
+	default n
+	---help---
+	Say Y if you need to force the assumption that CPEI can be re-targetted to
+	any cpu in the system. This hint is available via ACPI 3.0 specifications.
+	Tiger4 systems are capable of re-directing CPEI to any CPU other than BSP.
+	This option it useful to enable this feature on older BIOS's as well.
+	You can also enable this by using boot command line option force_cpei=1.
+
 config PREEMPT
 	bool "Preemptible Kernel"
         help

arch/ia64/configs/tiger_defconfig

@@ -116,6 +116,8 @@ CONFIG_FORCE_MAX_ZONEORDER=17
 CONFIG_SMP=y
 CONFIG_NR_CPUS=4
 CONFIG_HOTPLUG_CPU=y
+CONFIG_PERMIT_BSP_REMOVE=y
+CONFIG_FORCE_CPEI_RETARGET=y
 # CONFIG_SCHED_SMT is not set
 # CONFIG_PREEMPT is not set
 CONFIG_SELECT_MEMORY_MODEL=y

arch/ia64/kernel/acpi.c

@@ -284,19 +284,24 @@ acpi_parse_plat_int_src(acpi_table_entry_header * header,
 	return 0;
 }
 
+#ifdef CONFIG_HOTPLUG_CPU
 unsigned int can_cpei_retarget(void)
 {
 	extern int cpe_vector;
+	extern unsigned int force_cpei_retarget;
 
 	/*
 	 * Only if CPEI is supported and the override flag
 	 * is present, otherwise return that its re-targettable
 	 * if we are in polling mode.
 	 */
-	if (cpe_vector > 0 && !acpi_cpei_override)
-		return 0;
-	else
-		return 1;
+	if (cpe_vector > 0) {
+		if (acpi_cpei_override || force_cpei_retarget)
+			return 1;
+		else
+			return 0;
+	}
+	return 1;
 }
 
 unsigned int is_cpu_cpei_target(unsigned int cpu)
@@ -315,6 +320,7 @@ void set_cpei_target_cpu(unsigned int cpu)
 {
 	acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
 }
+#endif
 
 unsigned int get_cpei_target_cpu(void)
 {

arch/ia64/kernel/entry.S

@@ -1102,9 +1102,6 @@ skip_rbs_switch:
 	st8 [r2]=r8
 	st8 [r3]=r10
 .work_pending:
-	tbit.nz p6,p0=r31,TIF_SIGDELAYED		// signal delayed from  MCA/INIT/NMI/PMI context?
-(p6)	br.cond.sptk.few .sigdelayed
-	;;
 	tbit.z p6,p0=r31,TIF_NEED_RESCHED		// current_thread_info()->need_resched==0?
 (p6)	br.cond.sptk.few .notify
 #ifdef CONFIG_PREEMPT
@@ -1131,17 +1128,6 @@ skip_rbs_switch:
 (pLvSys)br.cond.sptk.few  .work_pending_syscall_end
 	br.cond.sptk.many .work_processed_kernel	// don't re-check
 
-// There is a delayed signal that was detected in MCA/INIT/NMI/PMI context where
-// it could not be delivered.  Deliver it now.  The signal might be for us and
-// may set TIF_SIGPENDING, so redrive ia64_leave_* after processing the delayed
-// signal.
-
-.sigdelayed:
-	br.call.sptk.many rp=do_sigdelayed
-	cmp.eq p6,p0=r0,r0				// p6 <- 1, always re-check
-(pLvSys)br.cond.sptk.few  .work_pending_syscall_end
-	br.cond.sptk.many .work_processed_kernel	// re-check
-
 .work_pending_syscall_end:
 	adds r2=PT(R8)+16,r12
 	adds r3=PT(R10)+16,r12

arch/ia64/kernel/iosapic.c

@@ -631,6 +631,7 @@ get_target_cpu (unsigned int gsi, int vector)
 {
 #ifdef CONFIG_SMP
 	static int cpu = -1;
+	extern int cpe_vector;
 
 	/*
 	 * In case of vector shared by multiple RTEs, all RTEs that
@@ -653,6 +654,11 @@ get_target_cpu (unsigned int gsi, int vector)
 	if (!cpu_online(smp_processor_id()))
 		return cpu_physical_id(smp_processor_id());
 
+#ifdef CONFIG_ACPI
+	if (cpe_vector > 0 && vector == IA64_CPEP_VECTOR)
+		return get_cpei_target_cpu();
+#endif
+
 #ifdef CONFIG_NUMA
 	{
 		int num_cpus, cpu_index, iosapic_index, numa_cpu, i = 0;

arch/ia64/kernel/irq.c

@@ -163,8 +163,19 @@ void fixup_irqs(void)
 {
 	unsigned int irq;
 	extern void ia64_process_pending_intr(void);
+	extern void ia64_disable_timer(void);
+	extern volatile int time_keeper_id;
+
+	ia64_disable_timer();
+
+	/*
+	 * Find a new timesync master
+	 */
+	if (smp_processor_id() == time_keeper_id) {
+		time_keeper_id = first_cpu(cpu_online_map);
+		printk ("CPU %d is now promoted to time-keeper master\n", time_keeper_id);
+	}
 
-	ia64_set_itv(1<<16);
 	/*
 	 * Phase 1: Locate irq's bound to this cpu and
 	 * relocate them for cpu removal.

arch/ia64/kernel/mca.c

@@ -281,14 +281,10 @@ ia64_mca_log_sal_error_record(int sal_info_type)
 		ia64_sal_clear_state_info(sal_info_type);
 }
 
-/*
- * platform dependent error handling
- */
-#ifndef PLATFORM_MCA_HANDLERS
-
 #ifdef CONFIG_ACPI
 
 int cpe_vector = -1;
+int ia64_cpe_irq = -1;
 
 static irqreturn_t
 ia64_mca_cpe_int_handler (int cpe_irq, void *arg, struct pt_regs *ptregs)
@@ -377,8 +373,6 @@ ia64_mca_register_cpev (int cpev)
 }
 #endif /* CONFIG_ACPI */
 
-#endif /* PLATFORM_MCA_HANDLERS */
-
 /*
  * ia64_mca_cmc_vector_setup
  *
@@ -630,6 +624,32 @@ copy_reg(const u64 *fr, u64 fnat, u64 *tr, u64 *tnat)
 	*tnat |= (nat << tslot);
 }
 
+/* Change the comm field on the MCA/INT task to include the pid that
+ * was interrupted, it makes for easier debugging.  If that pid was 0
+ * (swapper or nested MCA/INIT) then use the start of the previous comm
+ * field suffixed with its cpu.
+ */
+
+static void
+ia64_mca_modify_comm(const task_t *previous_current)
+{
+	char *p, comm[sizeof(current->comm)];
+	if (previous_current->pid)
+		snprintf(comm, sizeof(comm), "%s %d",
+			current->comm, previous_current->pid);
+	else {
+		int l;
+		if ((p = strchr(previous_current->comm, ' ')))
+			l = p - previous_current->comm;
+		else
+			l = strlen(previous_current->comm);
+		snprintf(comm, sizeof(comm), "%s %*s %d",
+			current->comm, l, previous_current->comm,
+			task_thread_info(previous_current)->cpu);
+	}
+	memcpy(current->comm, comm, sizeof(current->comm));
+}
+
 /* On entry to this routine, we are running on the per cpu stack, see
  * mca_asm.h.  The original stack has not been touched by this event.  Some of
  * the original stack's registers will be in the RBS on this stack.  This stack
@@ -648,7 +668,7 @@ ia64_mca_modify_original_stack(struct pt_regs *regs,
 		struct ia64_sal_os_state *sos,
 		const char *type)
 {
-	char *p, comm[sizeof(current->comm)];
+	char *p;
 	ia64_va va;
 	extern char ia64_leave_kernel[];	/* Need asm address, not function descriptor */
 	const pal_min_state_area_t *ms = sos->pal_min_state;
@@ -721,6 +741,10 @@ ia64_mca_modify_original_stack(struct pt_regs *regs,
 	/* Verify the previous stack state before we change it */
 	if (user_mode(regs)) {
 		msg = "occurred in user space";
+		/* previous_current is guaranteed to be valid when the task was
+		 * in user space, so ...
+		 */
+		ia64_mca_modify_comm(previous_current);
 		goto no_mod;
 	}
 	if (r13 != sos->prev_IA64_KR_CURRENT) {
@@ -750,25 +774,7 @@ ia64_mca_modify_original_stack(struct pt_regs *regs,
 		goto no_mod;
 	}
 
-	/* Change the comm field on the MCA/INT task to include the pid that
-	 * was interrupted, it makes for easier debugging.  If that pid was 0
-	 * (swapper or nested MCA/INIT) then use the start of the previous comm
-	 * field suffixed with its cpu.
-	 */
-	if (previous_current->pid)
-		snprintf(comm, sizeof(comm), "%s %d",
-			current->comm, previous_current->pid);
-	else {
-		int l;
-		if ((p = strchr(previous_current->comm, ' ')))
-			l = p - previous_current->comm;
-		else
-			l = strlen(previous_current->comm);
-		snprintf(comm, sizeof(comm), "%s %*s %d",
-			current->comm, l, previous_current->comm,
-			task_thread_info(previous_current)->cpu);
-	}
-	memcpy(current->comm, comm, sizeof(current->comm));
+	ia64_mca_modify_comm(previous_current);
 
 	/* Make the original task look blocked.  First stack a struct pt_regs,
 	 * describing the state at the time of interrupt.  mca_asm.S built a
@@ -908,7 +914,7 @@ ia64_mca_modify_original_stack(struct pt_regs *regs,
 static void
 ia64_wait_for_slaves(int monarch)
 {
-	int c, wait = 0;
+	int c, wait = 0, missing = 0;
 	for_each_online_cpu(c) {
 		if (c == monarch)
 			continue;
@@ -919,15 +925,32 @@ ia64_wait_for_slaves(int monarch)
 		}
 	}
 	if (!wait)
-		return;
+		goto all_in;
 	for_each_online_cpu(c) {
 		if (c == monarch)
 			continue;
 		if (ia64_mc_info.imi_rendez_checkin[c] == IA64_MCA_RENDEZ_CHECKIN_NOTDONE) {
 			udelay(5*1000000);	/* wait 5 seconds for slaves (arbitrary) */
+			if (ia64_mc_info.imi_rendez_checkin[c] == IA64_MCA_RENDEZ_CHECKIN_NOTDONE)
+				missing = 1;
 			break;
 		}
 	}
+	if (!missing)
+		goto all_in;
+	printk(KERN_INFO "OS MCA slave did not rendezvous on cpu");
+	for_each_online_cpu(c) {
+		if (c == monarch)
+			continue;
+		if (ia64_mc_info.imi_rendez_checkin[c] == IA64_MCA_RENDEZ_CHECKIN_NOTDONE)
+			printk(" %d", c);
+	}
+	printk("\n");
+	return;
+
+all_in:
+	printk(KERN_INFO "All OS MCA slaves have reached rendezvous\n");
+	return;
 }
 
 /*
@@ -953,6 +976,10 @@ ia64_mca_handler(struct pt_regs *regs, struct switch_stack *sw,
 	task_t *previous_current;
 
 	oops_in_progress = 1;	/* FIXME: make printk NMI/MCA/INIT safe */
+	console_loglevel = 15;	/* make sure printks make it to console */
+	printk(KERN_INFO "Entered OS MCA handler. PSP=%lx cpu=%d monarch=%ld\n",
+		sos->proc_state_param, cpu, sos->monarch);
+
 	previous_current = ia64_mca_modify_original_stack(regs, sw, sos, "MCA");
 	monarch_cpu = cpu;
 	if (notify_die(DIE_MCA_MONARCH_ENTER, "MCA", regs, 0, 0, 0)
@@ -1444,11 +1471,13 @@ void __devinit
 ia64_mca_cpu_init(void *cpu_data)
 {
 	void *pal_vaddr;
+	static int first_time = 1;
 
-	if (smp_processor_id() == 0) {
+	if (first_time) {
 		void *mca_data;
 		int cpu;
 
+		first_time = 0;
 		mca_data = alloc_bootmem(sizeof(struct ia64_mca_cpu)
 					 * NR_CPUS + KERNEL_STACK_SIZE);
 		mca_data = (void *)(((unsigned long)mca_data +
@@ -1704,6 +1733,7 @@ ia64_mca_late_init(void)
 					desc = irq_descp(irq);
 					desc->status |= IRQ_PER_CPU;
 					setup_irq(irq, &mca_cpe_irqaction);
+					ia64_cpe_irq = irq;
 				}
 			ia64_mca_register_cpev(cpe_vector);
 			IA64_MCA_DEBUG("%s: CPEI/P setup and enabled.\n", __FUNCTION__);

arch/ia64/kernel/perfmon.c

@@ -6722,6 +6722,7 @@ __initcall(pfm_init);
 void
 pfm_init_percpu (void)
 {
+	static int first_time=1;
 	/*
 	 * make sure no measurement is active
 	 * (may inherit programmed PMCs from EFI).
@@ -6734,8 +6735,10 @@ pfm_init_percpu (void)
 	 */
 	pfm_unfreeze_pmu();
 
-	if (smp_processor_id() == 0)
+	if (first_time) {
 		register_percpu_irq(IA64_PERFMON_VECTOR, &perfmon_irqaction);
+		first_time=0;
+	}
 
 	ia64_setreg(_IA64_REG_CR_PMV, IA64_PERFMON_VECTOR);
 	ia64_srlz_d();