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Subject[PATCH 1/1] cpumask: add alloc_cpumask_var_node V2
Subject: cpumask: add alloc_cpumask_var_node V2

V2: Fix syntax errors in function comments.
Display only one error message when !slab_is_available.
Add nop inline alloc_cpumask_var_node() for !SMP,
Fix EXPORT_SYMBOL for alloc_cpumask_var_node.

Add alloc_cpumask_var_node. This will be needed in x86 code to
allocate the domain and old_domain cpumasks on the same node as
where the containing irq_cfg struct is allocated.

Additional documentation added to all the alloc_cpumask and free_cpumask
functions.

For submission via linux-next.

Signed-off-by: Mike Travis <travis@sgi.com>
---
include/linux/cpumask.h | 7 ++++
lib/cpumask.c | 70 +++++++++++++++++++++++++++++++++++++++++++++---
2 files changed, 73 insertions(+), 4 deletions(-)
--- linux-2.6-for-ingo.orig/include/linux/cpumask.h
+++ linux-2.6-for-ingo/include/linux/cpumask.h
@@ -1026,6 +1026,7 @@ static inline size_t cpumask_size(void)
typedef struct cpumask *cpumask_var_t;

bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
+bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
void alloc_bootmem_cpumask_var(cpumask_var_t *mask);
void free_cpumask_var(cpumask_var_t mask);
void free_bootmem_cpumask_var(cpumask_var_t mask);
@@ -1038,6 +1039,12 @@ static inline bool alloc_cpumask_var(cpu
return true;
}

+static inline bool alloc_cpumask_var_node(cpumask_var_t *mask,
+ gfp_t flags, int node)
+{
+ return true;
+}
+
static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask)
{
}
--- linux-2.6-for-ingo.orig/lib/cpumask.c
+++ linux-2.6-for-ingo/lib/cpumask.c
@@ -76,39 +76,101 @@ int cpumask_any_but(const struct cpumask

/* These are not inline because of header tangles. */
#ifdef CONFIG_CPUMASK_OFFSTACK
+/**
+ * alloc_cpumask_var - return an allocated struct cpumask
+ * @mask: pointer to cpumask_var_t where the cpumask is returned
+ * @flags: GFP_ flags
+ *
+ * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is
+ * a nop returning a constant 1 (in <linux/cpumask.h>)
+ * Returns TRUE if memory allocation succeeded, FALSE otherwise.
+ */
bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
{
if (likely(slab_is_available()))
*mask = kmalloc(cpumask_size(), flags);
else {
+ *mask = NULL;
+
#ifdef CONFIG_DEBUG_PER_CPU_MAPS
printk(KERN_ERR
"=> alloc_cpumask_var: kmalloc not available!\n");
dump_stack();
-#endif
- *mask = NULL;
+ return false;
}
-#ifdef CONFIG_DEBUG_PER_CPU_MAPS
if (!*mask) {
printk(KERN_ERR "=> alloc_cpumask_var: failed!\n");
dump_stack();
- }
#endif
+ }
+
return *mask != NULL;
}
EXPORT_SYMBOL(alloc_cpumask_var);

+/**
+ * alloc_cpumask_var_node - return an allocated struct cpumask on a
+ * specific node.
+ * @mask: pointer to cpumask_var_t where the cpumask is returned
+ * @flags: GFP_ flags
+ * @node: node to allocate memory on
+ *
+ * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is
+ * a nop returning a constant 1 (in <linux/cpumask.h>)
+ * Returns TRUE if memory allocation succeeded, FALSE otherwise.
+ */
+bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node)
+{
+ if (likely(slab_is_available()))
+ *mask = kmalloc_node(cpumask_size(), flags, node);
+ else {
+ *mask = NULL;
+
+#ifdef CONFIG_DEBUG_PER_CPU_MAPS
+ printk(KERN_ERR
+ "=> alloc_cpumask_var_node: kmalloc not available!\n");
+ dump_stack();
+ return false;
+ }
+ if (!*mask) {
+ printk(KERN_ERR "=> alloc_cpumask_var_node: failed!\n");
+ dump_stack();
+#endif
+ }
+
+ return *mask != NULL;
+}
+EXPORT_SYMBOL(alloc_cpumask_var_node);
+
+/**
+ * alloc_bootmem_cpumask_var - return an allocated struct cpumask from
+ * the bootmem arena.
+ * @mask: pointer to cpumask_var_t where the cpumask is returned
+ *
+ * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is
+ * a nop returning a constant 1 (in <linux/cpumask.h>)
+ * Either returns an allocated (zero-filled) cpumask, or causes the
+ * system to panic.
+ */
void __init alloc_bootmem_cpumask_var(cpumask_var_t *mask)
{
*mask = alloc_bootmem(cpumask_size());
}

+/**
+ * free_cpumask_var - frees memory allocated for a struct cpumask.
+ * @mask: cpumask to free
+ */
void free_cpumask_var(cpumask_var_t mask)
{
kfree(mask);
}
EXPORT_SYMBOL(free_cpumask_var);

+/**
+ * free_bootmem_cpumask_var - frees bootmem memory allocated for a struct cpumask.
+ * @mask: cpumask to free
+ */
void __init free_bootmem_cpumask_var(cpumask_var_t mask)
{
free_bootmem((unsigned long)mask, cpumask_size());


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