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authorRusty Russell <rusty@rustcorp.com.au>2008-11-04 21:39:10 -0500
committerIngo Molnar <mingo@elte.hu>2008-11-06 03:05:33 -0500
commit2d3854a37e8b767a51aba38ed6d22817b0631e33 (patch)
tree3b55cc93720b2e525460216b196ed20298ae985b /include/linux/workqueue.h
parent75fa67706cce5272bcfc51ed646f2da21f3bdb6e (diff)
cpumask: introduce new API, without changing anything
Impact: introduce new APIs We want to deprecate cpumasks on the stack, as we are headed for gynormous numbers of CPUs. Eventually, we want to head towards an undefined 'struct cpumask' so they can never be declared on stack. 1) New cpumask functions which take pointers instead of copies. (cpus_* -> cpumask_*) 2) Several new helpers to reduce requirements for temporary cpumasks (cpumask_first_and, cpumask_next_and, cpumask_any_and) 3) Helpers for declaring cpumasks on or offstack for large NR_CPUS (cpumask_var_t, alloc_cpumask_var and free_cpumask_var) 4) 'struct cpumask' for explicitness and to mark new-style code. 5) Make iterator functions stop at nr_cpu_ids (a runtime constant), not NR_CPUS for time efficiency and for smaller dynamic allocations in future. 6) cpumask_copy() so we can allocate less than a full cpumask eventually (for alloc_cpumask_var), and so we can eliminate the 'struct cpumask' definition eventually. 7) work_on_cpu() helper for doing task on a CPU, rather than saving old cpumask for current thread and manipulating it. 8) smp_call_function_many() which is smp_call_function_mask() except taking a cpumask pointer. Note that this patch simply introduces the new functions and leaves the obsolescent ones in place. This is to simplify the transition patches. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/workqueue.h')
-rw-r--r--include/linux/workqueue.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index 89a5a1231ff..b36291130f2 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -240,4 +240,12 @@ void cancel_rearming_delayed_work(struct delayed_work *work)
240 cancel_delayed_work_sync(work); 240 cancel_delayed_work_sync(work);
241} 241}
242 242
243#ifndef CONFIG_SMP
244static inline long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg)
245{
246 return fn(arg);
247}
248#else
249long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg);
250#endif /* CONFIG_SMP */
243#endif 251#endif