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cpumask: convert RCU implementations

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Impact: use new cpumask API.

rcu_ctrlblk contains a cpumask, and it's highly optimized so I don't want
a cpumask_var_t (ie. a pointer) for the CONFIG_CPUMASK_OFFSTACK case.  It
could use a dangling bitmap, and be allocated in __rcu_init to save memory,
but for the moment we use a bitmap.

(Eventually 'struct cpumask' will be undefined for CONFIG_CPUMASK_OFFSTACK,
so we use a bitmap here to show we really mean it).

We remove on-stack cpumasks, using cpumask_var_t for
rcu_torture_shuffle_tasks() and for_each_cpu_and in force_quiescent_state().

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2009-01-01 10:12:26 +10:30
parent d036e67b40
commit bd232f97b3
4 changed files with 44 additions and 38 deletions
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4
include/linux/rcuclassic.h
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@ -59,8 +59,8 @@ struct rcu_ctrlblk {
int signaled;
spinlock_t lock ____cacheline_internodealigned_in_smp;
cpumask_t cpumask; /* CPUs that need to switch in order */
/* for current batch to proceed. */
DECLARE_BITMAP(cpumask, NR_CPUS); /* CPUs that need to switch for */
/* current batch to proceed. */
} ____cacheline_internodealigned_in_smp;
/* Is batch a before batch b ? */