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Message-ID: <49471353.9070204@sgi.com>
Date: Mon, 15 Dec 2008 18:32:51 -0800
From: Mike Travis <travis@....com>
To: Rusty Russell <rusty@...tcorp.com.au>
CC: Stephen Rothwell <sfr@...b.auug.org.au>,
Ingo Molnar <mingo@...hat.com>, linux-next@...r.kernel.org,
LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/1] cpumask: add 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@....com>
---
include/linux/cpumask.h | 1
lib/cpumask.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 61 insertions(+)
--- linux-2.6-next.orig/include/linux/cpumask.h
+++ linux-2.6-next/include/linux/cpumask.h
@@ -1008,6 +1008,7 @@ 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);
--- linux-2.6-next.orig/lib/cpumask.c
+++ linux-2.6-next/lib/cpumask.c
@@ -76,6 +76,15 @@ 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
+ * @cpu: 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()))
@@ -98,17 +107,68 @@ bool alloc_cpumask_var(cpumask_var_t *ma
}
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
+ * @cpu: 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 {
+#ifdef CONFIG_DEBUG_PER_CPU_MAPS
+ printk(KERN_ERR
+ "=> alloc_cpumask_var_node: kmalloc not available!\n");
+ dump_stack();
+#endif
+ *mask = NULL;
+ }
+#ifdef CONFIG_DEBUG_PER_CPU_MAPS
+ if (!*mask) {
+ printk(KERN_ERR "=> alloc_cpumask_var_node: failed!\n");
+ dump_stack();
+ }
+#endif
+ return *mask != NULL;
+}
+EXPORT_SYMBOL(alloc_cpumask_var);
+
+/**
+ * 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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