Joe Perches wrote:
> On Sat, 2014-01-11 at 10:28 +0900, Tetsuo Handa wrote:
> > Step 1: (targeted to 3.14-rc1)
> > Add "%pT" format specifier and commcpy() wrapper function.
> >
> > Step 2: (started after step 1 is reflected to other git trees)
> > Replace printk("%s", p->comm) with printk("%pT", p).
>
> Replace printk("%s", current->comm) with printk("%pT", NULL);
>
> ?
Right. I forgot to add it.
>
> > Replace strcpy(buf, p->comm) with commcpy(buf, p).
>
> > Step 3: (started after step 2 is reflected to other git trees)
> > Add rcu_read_lock()/rcu_read_unlock() into commcpy().
> > Modify set_task_comm() etc. to replace ->comm using RCU.
>
> Aren't steps 2 and 3 independent?
>
If step 3 is merged before step 2 complete, those who are not using
"%pT" or commcpy() might crash due to reading RCU protected ->comm without
rcu_read_lock()/rcu_read_unlock().
Step 2 depends on step 1 for avoiding compile time errors.
Step 3 depends on step 2 for avoiding run time errors.
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