cpumask: introduce new API, without changing anything, v3

[linux-2.6-omap-h63xx.git] / lib / cpumask.c

diff --git a/lib/cpumask.c b/lib/cpumask.c
index 5f97dc25ef9c925fb68b83fecec5a7c0114ab339..8d03f22c6ced0176c3f2c368f58b3a167918a86e 100644 (file)
--- a/lib/cpumask.c
+++ b/lib/cpumask.c
@@ -2,6 +2,7 @@
 #include <linux/bitops.h>
 #include <linux/cpumask.h>
 #include <linux/module.h>
+#include <linux/bootmem.h>
 
 int __first_cpu(const cpumask_t *srcp)
 {
@@ -35,3 +36,81 @@ int __any_online_cpu(const cpumask_t *mask)
        return cpu;
 }
 EXPORT_SYMBOL(__any_online_cpu);
+
+/**
+ * cpumask_next_and - get the next cpu in *src1p & *src2p
+ * @n: the cpu prior to the place to search (ie. return will be > @n)
+ * @src1p: the first cpumask pointer
+ * @src2p: the second cpumask pointer
+ *
+ * Returns >= nr_cpu_ids if no further cpus set in both.
+ */
+int cpumask_next_and(int n, const struct cpumask *src1p,
+                    const struct cpumask *src2p)
+{
+       while ((n = cpumask_next(n, src1p)) < nr_cpu_ids)
+               if (cpumask_test_cpu(n, src2p))
+                       break;
+       return n;
+}
+EXPORT_SYMBOL(cpumask_next_and);
+
+/**
+ * cpumask_any_but - return a "random" in a cpumask, but not this one.
+ * @mask: the cpumask to search
+ * @cpu: the cpu to ignore.
+ *
+ * Often used to find any cpu but smp_processor_id() in a mask.
+ * Returns >= nr_cpu_ids if no cpus set.
+ */
+int cpumask_any_but(const struct cpumask *mask, unsigned int cpu)
+{
+       unsigned int i;
+
+       cpumask_check(cpu);
+       for_each_cpu(i, mask)
+               if (i != cpu)
+                       break;
+       return i;
+}
+
+/* These are not inline because of header tangles. */
+#ifdef CONFIG_CPUMASK_OFFSTACK
+bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
+{
+       if (likely(slab_is_available()))
+               *mask = kmalloc(cpumask_size(), flags);
+       else {
+#ifdef CONFIG_DEBUG_PER_CPU_MAPS
+               printk(KERN_ERR
+                       "=> alloc_cpumask_var: kmalloc not available!\n");
+               dump_stack();
+#endif
+               *mask = NULL;
+       }
+#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);
+
+void __init alloc_bootmem_cpumask_var(cpumask_var_t *mask)
+{
+       *mask = alloc_bootmem(cpumask_size());
+}
+
+void free_cpumask_var(cpumask_var_t mask)
+{
+       kfree(mask);
+}
+EXPORT_SYMBOL(free_cpumask_var);
+
+void __init free_bootmem_cpumask_var(cpumask_var_t mask)
+{
+       free_bootmem((unsigned long)mask, cpumask_size());
+}
+#endif