diff options
| author | Rusty Russell <rusty@rustcorp.com.au> | 2008-10-27 11:03:14 +1100 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2008-10-27 11:03:14 +1100 |
| commit | 8c4e41fd93f59bd7f0ad34d34940b1d2627bdd47 (patch) | |
| tree | abf539ddcec68d2960200860b873542b3c17a1f7 /lib | |
| parent | 293125755a4d6c522bb6a80afb7b297dc24fdfff (diff) | |
cpumask:cpumask_var_t
We want to move cpumasks off the stack: no local decls, no passing by
copy. Linus suggested we use the array-or-pointer trick for on-stack
vars; we introduce a new cpumask_var_t for this.
Rather than pick an arbitrary limit, I chose a new config option so
arch maintainers can decide where their threshold is.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Mike Travis <travis@sgi.com>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/cpumask.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/lib/cpumask.c b/lib/cpumask.c index 080d1219b073..d131e5fed1ae 100644 --- a/lib/cpumask.c +++ b/lib/cpumask.c @@ -43,3 +43,34 @@ int __any_online_cpu(const cpumask_t *mask) return cpu; } EXPORT_SYMBOL(__any_online_cpu); + +/* 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 free_cpumask_var(cpumask_var_t mask) +{ + kfree(mask); +} +EXPORT_SYMBOL(free_cpumask_var); +#endif |