From 75c1c91cb92806f960fcd6e53d2a0c21f343081c Mon Sep 17 00:00:00 2001 From: Dimitri Sivanich Date: Tue, 28 Dec 2010 13:34:42 -0600 Subject: [IA64] eliminate race condition in smp_flush_tlb_mm A race condition exists within smp_call_function_many() when called from smp_flush_tlb_mm(). On rare occasions the cpu_vm_mask can be cleared while smp_call_function_many is executing, occasionally resulting in a hung process. Make a copy of the mask prior to calling smp_call_function_many(). Signed-off-by: Dimitri Sivanich Signed-off-by: Tony Luck --- arch/ia64/kernel/smp.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/arch/ia64/kernel/smp.c b/arch/ia64/kernel/smp.c index dabeefe2..be450a3 100644 --- a/arch/ia64/kernel/smp.c +++ b/arch/ia64/kernel/smp.c @@ -293,6 +293,7 @@ smp_flush_tlb_all (void) void smp_flush_tlb_mm (struct mm_struct *mm) { + cpumask_var_t cpus; preempt_disable(); /* this happens for the common case of a single-threaded fork(): */ if (likely(mm == current->active_mm && atomic_read(&mm->mm_users) == 1)) @@ -301,9 +302,15 @@ smp_flush_tlb_mm (struct mm_struct *mm) preempt_enable(); return; } - - smp_call_function_many(mm_cpumask(mm), - (void (*)(void *))local_finish_flush_tlb_mm, mm, 1); + if (!alloc_cpumask_var(&cpus, GFP_ATOMIC)) { + smp_call_function((void (*)(void *))local_finish_flush_tlb_mm, + mm, 1); + } else { + cpumask_copy(cpus, mm_cpumask(mm)); + smp_call_function_many(cpus, + (void (*)(void *))local_finish_flush_tlb_mm, mm, 1); + free_cpumask_var(cpus); + } local_irq_disable(); local_finish_flush_tlb_mm(mm); local_irq_enable(); -- cgit v1.1 From e21763dbce76d3a07ead438f8811b3e4bce0825b Mon Sep 17 00:00:00 2001 From: Jesper Juhl Date: Sat, 30 Oct 2010 21:35:58 +0200 Subject: [IA64] perfmon: Change vmalloc to vzalloc and drop memset. vzalloc() nicely zeroes memory for us, so we don't have to do a vmalloc() and then manually memset() the returned memory when all we want is for it to be zero. Patch changes this for pfm_rvmalloc(). Signed-off-by: Jesper Juhl Signed-off-by: Tony Luck --- arch/ia64/kernel/perfmon.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c index 39e534f..3aee09d 100644 --- a/arch/ia64/kernel/perfmon.c +++ b/arch/ia64/kernel/perfmon.c @@ -829,10 +829,9 @@ pfm_rvmalloc(unsigned long size) unsigned long addr; size = PAGE_ALIGN(size); - mem = vmalloc(size); + mem = vzalloc(size); if (mem) { //printk("perfmon: CPU%d pfm_rvmalloc(%ld)=%p\n", smp_processor_id(), size, mem); - memset(mem, 0, size); addr = (unsigned long)mem; while (size > 0) { pfm_reserve_page(addr); -- cgit v1.1 From 409e590572d980c314e989e94176bcb060130fae Mon Sep 17 00:00:00 2001 From: Jiri Slaby Date: Mon, 22 Nov 2010 10:41:19 +0100 Subject: [IA64] irq_ia64, use set_irq_chip Don't access desc->chip directly, because them chip member will disappear some time later. Signed-off-by: Jiri Slaby Cc: Thomas Gleixner Signed-off-by: Tony Luck --- arch/ia64/kernel/irq_ia64.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/ia64/kernel/irq_ia64.c b/arch/ia64/kernel/irq_ia64.c index 9a26015..38c07b8 100644 --- a/arch/ia64/kernel/irq_ia64.c +++ b/arch/ia64/kernel/irq_ia64.c @@ -633,7 +633,7 @@ ia64_native_register_percpu_irq (ia64_vector vec, struct irqaction *action) BUG_ON(bind_irq_vector(irq, vec, CPU_MASK_ALL)); desc = irq_desc + irq; desc->status |= IRQ_PER_CPU; - desc->chip = &irq_type_ia64_lsapic; + set_irq_chip(irq, &irq_type_ia64_lsapic); if (action) setup_irq(irq, action); set_irq_handler(irq, handle_percpu_irq); -- cgit v1.1 From e7d282535c94cddc208c03b7cd0815f70d676a0e Mon Sep 17 00:00:00 2001 From: Joe Perches Date: Thu, 9 Dec 2010 23:16:55 -0800 Subject: [IA64] Remove unlikely from cpu_is_offline cpu_is_offline already uses unlikely internally. Signed-off-by: Joe Perches Signed-off-by: Tony Luck --- arch/ia64/kernel/time.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c index ed6f22e..9702fa9 100644 --- a/arch/ia64/kernel/time.c +++ b/arch/ia64/kernel/time.c @@ -168,7 +168,7 @@ timer_interrupt (int irq, void *dev_id) { unsigned long new_itm; - if (unlikely(cpu_is_offline(smp_processor_id()))) { + if (cpu_is_offline(smp_processor_id())) { return IRQ_HANDLED; } -- cgit v1.1 From 05f2f274c8a8747bbfb13ac8ee0c27d5f2ad8510 Mon Sep 17 00:00:00 2001 From: Tony Luck Date: Fri, 7 Jan 2011 09:11:55 -0800 Subject: [IA64] Avoid array overflow if there are too many cpus in SRAT table acpi_numa_init() has to parse the whole SRAT table, even if the kernel wants to limit the number of cpus it will use (because the ones it is going to use may be described by entries at the end of the SRAT table). Avoid overflowing the node_cpuid array. Reported-by: Yinghai Lu Signed-off-by: Tony Luck --- arch/ia64/kernel/acpi.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c index c6c90f3..7b897b7 100644 --- a/arch/ia64/kernel/acpi.c +++ b/arch/ia64/kernel/acpi.c @@ -477,6 +477,12 @@ acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa) if (!(pa->flags & ACPI_SRAT_CPU_ENABLED)) return; + if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) { + printk_once(KERN_WARNING + "node_cpuid[%d] is too small, may not be able to use all cpus\n", + ARRAY_SIZE(node_cpuid)); + return; + } pxm = get_processor_proximity_domain(pa); /* record this node in proximity bitmap */ -- cgit v1.1