linux-kernel - Re: [PATCH] ptrace: add ability to retrieve signals without removing from a queue (v2)

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Date:	Mon, 25 Feb 2013 14:13:43 +0400
From:	Pavel Emelyanov <xemul@...allels.com>
To:	Andrey Vagin <avagin@...nvz.org>
CC:	linux-kernel@...r.kernel.org, criu@...nvz.org,
	linux-api@...r.kernel.org, Roland McGrath <roland@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	David Howells <dhowells@...hat.com>,
	Dave Jones <davej@...hat.com>,
	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pedro Alves <palves@...hat.com>
Subject: Re: [PATCH] ptrace: add ability to retrieve signals without removing
 from a queue (v2)

> +	for (i = 0; i < arg.nr; i++) {
> +		off = arg.off + i;
> +
> +		spin_lock_irq(&child->sighand->siglock);
> +		list_for_each_entry(q, &pending->list, list) {
> +			if (!off--) {
> +				copy_siginfo(&info, &q->info);
> +				break;
> +			}
> +		}
> +		spin_unlock_irq(&child->sighand->siglock);

What's the point of arg.nr if you for every single siginfo drop the lock
and perform linear search anyway?

Thanks,
Pavel
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