Andrew Morton wrote:
+static inline int get_task_struct_rcu(struct task_struct *t)
+{
+ int oldusage;
+
+ do {
+ oldusage = atomic_read(&t->usage);
+ if (oldusage == 0) {
+ return 0;
+ }
+ } while (cmpxchg(&t->usage.counter,
+ oldusage, oldusage + 1) != oldusage);
+ return 1;
+}
arm (at least) does not implement cmpxchg.
Yes, and using atomic_t.counter in generic code is ugly, albeit
compatible with all current implementations.
I think Nick is working on patches which implement cmpxchg on all
architectures?
Yes, it is basically ready to go.
--
SUSE Labs, Novell Inc.
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