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author | Mike Travis <travis@sgi.com> | 2008-12-19 16:56:52 +1030 |
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committer | Rusty Russell <rusty@rustcorp.com.au> | 2008-12-19 16:56:52 +1030 |
commit | ec26b805879c7e77865b39ee91b737985e80006d (patch) | |
tree | d5d5c06c81ff7ed21b061b7d42cfe77d4de8a90b /lib/cpumask.c | |
parent | 7b4967c532045a1983d6d4af5c69cc7c5109f62b (diff) | |
download | kernel_samsung_tuna-ec26b805879c7e77865b39ee91b737985e80006d.zip kernel_samsung_tuna-ec26b805879c7e77865b39ee91b737985e80006d.tar.gz kernel_samsung_tuna-ec26b805879c7e77865b39ee91b737985e80006d.tar.bz2 |
cpumask: documentation for cpumask_var_t
Impact: New kerneldoc comments
Additional documentation added to all the alloc_cpumask and free_cpumask
functions.
Signed-off-by: Mike Travis <travis@sgi.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (minor additions)
Diffstat (limited to 'lib/cpumask.c')
-rw-r--r-- | lib/cpumask.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/lib/cpumask.c b/lib/cpumask.c index 3f258f5..a24edf1 100644 --- a/lib/cpumask.c +++ b/lib/cpumask.c @@ -76,6 +76,20 @@ int cpumask_any_but(const struct cpumask *mask, unsigned int cpu) /* These are not inline because of header tangles. */ #ifdef CONFIG_CPUMASK_OFFSTACK +/** + * alloc_cpumask_var_node - allocate a struct cpumask on a given node + * @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. + * + * In addition, mask will be NULL if this fails. Note that gcc is + * usually smart enough to know that mask can never be NULL if + * CONFIG_CPUMASK_OFFSTACK=n, so does code elimination in that case + * too. + */ bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node) { if (likely(slab_is_available())) @@ -97,23 +111,52 @@ bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node) } EXPORT_SYMBOL(alloc_cpumask_var_node); +/** + * alloc_cpumask_var - allocate a 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>). + * + * See alloc_cpumask_var_node. + */ bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) { return alloc_cpumask_var_node(mask, flags, numa_node_id()); } EXPORT_SYMBOL(alloc_cpumask_var); +/** + * alloc_bootmem_cpumask_var - allocate a 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 + * + * This is safe on a NULL mask. + */ void free_cpumask_var(cpumask_var_t mask) { kfree(mask); } EXPORT_SYMBOL(free_cpumask_var); +/** + * free_bootmem_cpumask_var - frees result of alloc_bootmem_cpumask_var + * @mask: cpumask to free + */ void __init free_bootmem_cpumask_var(cpumask_var_t mask) { free_bootmem((unsigned long)mask, cpumask_size()); |