linux-kernel - Re: [PATCH 2/4] compat: backport work

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Message-ID: <CAB=NE6V4NuNc8Xr3qKAaXgs2og-2e6qusek=ZFdvQCq4JtKavQ@mail.gmail.com>
Date:	Tue, 20 Mar 2012 06:50:44 -0700
From:	"Luis R. Rodriguez" <mcgrof@...jolero.org>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
	lf_driver_backport@...ts.linux-foundation.org
Subject: Re: [PATCH 2/4] compat: backport work_busy()

On Tue, Mar 20, 2012 at 5:07 AM, Johannes Berg
<johannes@...solutions.net> wrote:
> On Mon, 2012-03-19 at 20:26 -0700, Luis R. Rodriguez wrote:
>> From: "Luis R. Rodriguez" <mcgrof@...jolero.org>
>>
>> Best we can do is just tell the users of we are WORK_BUSY_PENDING
>> for older kernels. The ckmake log:
>
> [...]
>
>> + * Test whether @work is currently pending or running.  There is no
>> + * synchronization around this function and the test result is
>> + * unreliable and only useful as advisory hints or for debugging.
>> + * Especially for reentrant wqs, the pending state might hide the
>> + * running state.
>
> What's this needed for? It seems if it's used only for hints/debugging
> we should not need the function, or possibly simply return some
> pointless combination like -1?

net/bluetooth/hci_core.c:1701:	if (work_busy(&hdev->le_scan))

  Luis
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