linux-kernel - Re: [PATCH -mm1 1/2] fixing idr

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Message-ID: <46FCA87F.3000605@bull.net>
Date:	Fri, 28 Sep 2007 09:08:47 +0200
From:	Nadia Derbey <Nadia.Derbey@...l.net>
To:	Jarek Poplawski <jarkao2@...pl>
Cc:	akpm@...ux-foundation.org, adobriyan@...ru,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm1 1/2] fixing idr_find() locking

Jarek Poplawski wrote:
> On Thu, Sep 27, 2007 at 04:33:55PM +0200, Nadia.Derbey@...l.net wrote:
> 
>>[PATCH 01/02]
>>
>>
>>This is a patch that fixes the way idr_find() used to be called in ipc_lock():
>>in all the paths that don't imply an update of the ipcs idr, it was called
>>without the idr tree being locked.
>>
>>The changes are:
>>  . in ipc_ids, the mutex has been changed into a reader/writer semaphore.
>>  . ipc_lock() now takes the mutex as a reader during the idr_find().
>>  . a new routine ipc_lock_down() has been defined: it doesn't take the
>>    mutex, assuming that it is being held by the caller. This is the routine
>>    that is now called in all the update paths.
>>
>>
>>Signed-off-by: Nadia Derbey <Nadia.Derbey@...l.net>
> 
> 
> Acked-by: Jarek Poplawski <jarkao2@...pl>
> 
> PS: there is one big mistake around To/Cc ordering, so I doubt Andrew
> will ever sign this...
> 
> 

Jarek,

I thought that since you were the one who pointed out the issue I had to 
put you as the receiver.
Next time I'll also add Andrew in the To list.
Sorry for that.

Regards,
Nadia

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