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SubjectRe: [PATCH] Fixes for RCU handling of task_struct
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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