Re: [PATCH] Fixes for RCU handling of task_struct

[Andrew Morton]

Ingo Molnar <mingo@xxxxxxx> wrote:
>
> @@ -1433,7 +1485,16 @@ send_group_sigqueue(int sig, struct sigq
>   	int ret = 0;
>   
>   	BUG_ON(!(q->flags & SIGQUEUE_PREALLOC));
>  -	read_lock(&tasklist_lock);
>  +
>  +	while(!read_trylock(&tasklist_lock)) {
>  +		if (!p->sighand)
>  +			return -1;
>  +		cpu_relax();
>  +	}

This looks kind of ugly and quite unobvious.

What's going on there?
-
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