linux-kernel - Re: [PATCH -next] ipc: make refcounter atomic (was Re: linux-next: Tree for Apr 23 [ Call-Traces: lib/debugobjects.c | kernel/rcupdate.c

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Message-ID: <CA+i8gK+ouTuk=1oUT8ZLrLnbKDf75-f_NPeXn9763JK-csRdmQ@mail.gmail.com>
Date:	Thu, 25 Apr 2013 20:14:42 +0700
From:	Emmanuel Benisty <benisty.e@...il.com>
To:	Rik van Riel <riel@...riel.com>
Cc:	sedat.dilek@...il.com, Davidlohr Bueso <davidlohr.bueso@...com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Paul McKenney <paul.mckenney@...aro.org>,
	linux-next <linux-next@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] ipc: make refcounter atomic (was Re: linux-next:
 Tree for Apr 23 [ Call-Traces: lib/debugobjects.c | kernel/rcupdate.c |
 kernel/rcutree.c ])

On Thu, Apr 25, 2013 at 7:56 PM, Rik van Riel <riel@...riel.com> wrote:
> On 04/24/2013 07:05 PM, Sedat Dilek wrote:
>>
>> On Thu, Apr 25, 2013 at 12:16 AM, Davidlohr Bueso
>> <davidlohr.bueso@...com> wrote:
>
>
>>> This patch converts the IPC RCU header's reference counter to atomic_t.
>>> The return of
>>> ipc_rcu_getref() is modified to inform the callers if it actually
>>> succeeded.
>>>
>>> Now all callers return -EIDRM upon failure and abort the current
>>> operation. Two exceptions are
>>> in semaphore code where sem_getref_and_unlock() and sem_getref() trigger
>>> a warning but proceed
>>> to freeing up any held locks.
>>>
>>> Signed-off-by: Davidlohr Bueso <davidlohr.bueso@...com>
>>> Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org>
>>> CC: Rik van Riel <riel@...riel.com>
>>> CC: Paul McKenney <paul.mckenney@...aro.org>
>>> CC: Sedat Dilek <sedat.dilek@...il.com>
>>> CC: Emmanuel Benisty <benisty.e@...il.com>
>>> CC: Andrew Morton <akpm@...ux-foundation.org>
>>
>>
>> Missing my Reported-by ...!
>
>
>> ...so please add also my Tested-by!
>
>
> And my ax!
>
> I mean ... Reviewed-by: Rik van Riel <riel@...hat.com>

FWIW, my machine survived building chromium with this patch instead of Linus'.

Thanks.
-- Emmanuel
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