Re: [RFC 2/1] kill task_ucounts()->rcu_read_lock(), add __task_ucounts()

[David Howells]

Oleg Nesterov <oleg@xxxxxxxxxx> wrote:

> So I think task_ucounts() can just do
> 
> 	/* The caller must ensure that ->real_cred is stable or take rcu_read_lock() */
> 	#define task_ucounts(task)	\
> 		rcu_dereference_check((task)->real_cred, 1)->ucounts

Can you use rcu_access_pointer() within exit.c?  E.g.:

	struct cred *pcreds = rcu_access_pointer(task->real_cred);
	dec_rlimit_ucounts(pcreds->ucounts, UCOUNT_RLIMIT_NPROC, 1);

David