lkml.org 
[lkml]   [2009]   [Apr]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH 1/9] irq: correct CPUMASKS_OFFSTACK typo -v5

Impact: fix smp_affinity copying when moving irq_desc

CPUMASKS_OFFSTACK is not defined anywhere. it is a typo
and init_allocate_desc_masks called before it set affinity to all cpus...

split init_alloc_desc_masks() into all_desc_masks() and init_desc_masks()

also could use that CPUMASK_OFFSTACK in alloc_desc_masks()

v5: apply before NUMA_IRQ_DESC_MIGRATION

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>

---
include/linux/irq.h | 27 ++++++++++++++++++---------
kernel/irq/handle.c | 9 ++++++---
kernel/irq/numa_migrate.c | 2 +-
3 files changed, 25 insertions(+), 13 deletions(-)
Index: linux-2.6/include/linux/irq.h
===================================================================
--- linux-2.6.orig/include/linux/irq.h
+++ linux-2.6/include/linux/irq.h
@@ -424,27 +424,25 @@ extern int set_irq_msi(unsigned int irq,

#ifdef CONFIG_SMP
/**
- * init_alloc_desc_masks - allocate cpumasks for irq_desc
+ * alloc_desc_masks - allocate cpumasks for irq_desc
* @desc: pointer to irq_desc struct
* @cpu: cpu which will be handling the cpumasks
* @boot: true if need bootmem
*
* Allocates affinity and pending_mask cpumask if required.
* Returns true if successful (or not required).
- * Side effect: affinity has all bits set, pending_mask has all bits clear.
*/
-static inline bool init_alloc_desc_masks(struct irq_desc *desc, int cpu,
+static inline bool alloc_desc_masks(struct irq_desc *desc, int cpu,
bool boot)
{
+#ifdef CONFIG_CPUMASK_OFFSTACK
int node;

if (boot) {
alloc_bootmem_cpumask_var(&desc->affinity);
- cpumask_setall(desc->affinity);

#ifdef CONFIG_GENERIC_PENDING_IRQ
alloc_bootmem_cpumask_var(&desc->pending_mask);
- cpumask_clear(desc->pending_mask);
#endif
return true;
}
@@ -453,18 +451,25 @@ static inline bool init_alloc_desc_masks

if (!alloc_cpumask_var_node(&desc->affinity, GFP_ATOMIC, node))
return false;
- cpumask_setall(desc->affinity);

#ifdef CONFIG_GENERIC_PENDING_IRQ
if (!alloc_cpumask_var_node(&desc->pending_mask, GFP_ATOMIC, node)) {
free_cpumask_var(desc->affinity);
return false;
}
- cpumask_clear(desc->pending_mask);
+#endif
#endif
return true;
}

+static inline void init_desc_masks(struct irq_desc *desc)
+{
+ cpumask_setall(desc->affinity);
+#ifdef CONFIG_GENERIC_PENDING_IRQ
+ cpumask_clear(desc->pending_mask);
+#endif
+}
+
/**
* init_copy_desc_masks - copy cpumasks for irq_desc
* @old_desc: pointer to old irq_desc struct
@@ -478,7 +483,7 @@ static inline bool init_alloc_desc_masks
static inline void init_copy_desc_masks(struct irq_desc *old_desc,
struct irq_desc *new_desc)
{
-#ifdef CONFIG_CPUMASKS_OFFSTACK
+#ifdef CONFIG_CPUMASK_OFFSTACK
cpumask_copy(new_desc->affinity, old_desc->affinity);

#ifdef CONFIG_GENERIC_PENDING_IRQ
@@ -499,12 +504,16 @@ static inline void free_desc_masks(struc

#else /* !CONFIG_SMP */

-static inline bool init_alloc_desc_masks(struct irq_desc *desc, int cpu,
+static inline bool alloc_desc_masks(struct irq_desc *desc, int cpu,
bool boot)
{
return true;
}

+static inline void init_desc_masks(struct irq_desc *desc)
+{
+}
+
static inline void init_copy_desc_masks(struct irq_desc *old_desc,
struct irq_desc *new_desc)
{
Index: linux-2.6/kernel/irq/handle.c
===================================================================
--- linux-2.6.orig/kernel/irq/handle.c
+++ linux-2.6/kernel/irq/handle.c
@@ -117,10 +117,11 @@ static void init_one_irq_desc(int irq, s
printk(KERN_ERR "can not alloc kstat_irqs\n");
BUG_ON(1);
}
- if (!init_alloc_desc_masks(desc, cpu, false)) {
+ if (!alloc_desc_masks(desc, cpu, false)) {
printk(KERN_ERR "can not alloc irq_desc cpumasks\n");
BUG_ON(1);
}
+ init_desc_masks(desc);
arch_init_chip_data(desc, cpu);
}

@@ -171,7 +172,8 @@ int __init early_irq_init(void)
desc[i].irq = i;
desc[i].kstat_irqs = kstat_irqs_legacy + i * nr_cpu_ids;
lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
- init_alloc_desc_masks(&desc[i], 0, true);
+ alloc_desc_masks(&desc[i], 0, true);
+ init_desc_masks(&desc[i]);
irq_desc_ptrs[i] = desc + i;
}

@@ -258,7 +260,8 @@ int __init early_irq_init(void)

for (i = 0; i < count; i++) {
desc[i].irq = i;
- init_alloc_desc_masks(&desc[i], 0, true);
+ alloc_desc_masks(&desc[i], 0, true);
+ init_desc_masks(&desc[i]);
desc[i].kstat_irqs = kstat_irqs_all[i];
}
return arch_early_irq_init();
Index: linux-2.6/kernel/irq/numa_migrate.c
===================================================================
--- linux-2.6.orig/kernel/irq/numa_migrate.c
+++ linux-2.6/kernel/irq/numa_migrate.c
@@ -37,7 +37,7 @@ static bool init_copy_one_irq_desc(int i
struct irq_desc *desc, int cpu)
{
memcpy(desc, old_desc, sizeof(struct irq_desc));
- if (!init_alloc_desc_masks(desc, cpu, false)) {
+ if (!alloc_desc_masks(desc, cpu, false)) {
printk(KERN_ERR "irq %d: can not get new irq_desc cpumask "
"for migration.\n", irq);
return false;

\
 
 \ /
  Last update: 2009-04-28 03:01    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site