linux-kernel - Re: [PATCH] idr: Don't WARN in idr

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Message-ID: <20130226014027.GH2679@htj.dyndns.org>
Date:	Mon, 25 Feb 2013 17:40:27 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] idr: Don't WARN in idr_find

On Mon, Feb 25, 2013 at 08:37:12PM -0500, Peter Hurley wrote:
> Since idr is used for syscall apis (to associate 'handles' with
> internal structures), don't WARN with invalid input.
> 
> For example, POSIX timers are identified by timer_t id. These
> ids are idr values. If userspace passes a representable timer_t id
> value (eg, id < 0) but which was not previous allocated (since the
> current idr api does not return negative idr values), then the
> syscall properly returns an error; a WARN is unnecessary and
> undesirable.

WARN_ON() on negative was intentional.  Because the previous
implmentation silently dropped the msb, we at least wanna know who has
been passing in negative indices.  Patch for the lock_timer is already
in -mm.

Thanks.

-- 
tejun
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