From: Jens Axboe <axboe@fb.com>
To: David Rientjes <rientjes@google.com>,
Lars Ellenberg <drbd-dev@lists.linbit.com>
Cc: linux-kernel@vger.kernel.org, drbd-user@lists.linbit.com
Subject: Re: [Drbd-dev] [patch 1/2] block, drbd: fix drbd_req_new() initialization
Date: Sat, 7 Mar 2015 17:33:55 -0700 [thread overview]
Message-ID: <54FB98F3.2050308@fb.com> (raw)
In-Reply-To: <alpine.DEB.2.10.1503071623250.31688@chino.kir.corp.google.com>
On 03/07/2015 05:24 PM, David Rientjes wrote:
> mempool_alloc() does not support __GFP_ZERO since elements may come from
> memory that has already been released by mempool_free().
>
> Remove __GFP_ZERO from mempool_alloc() in drbd_req_new() and properly
> initialize it to 0.
You should add it to mempool instead, avoid having this issue show up
for other folks as well. It'd be trivial to do. Normal ->alloc() should
honor __GFP_ZERO, just do the same manually for removing an item from
the internal pool.
--
Jens Axboe
WARNING: multiple messages have this Message-ID (diff)
From: Jens Axboe <axboe@fb.com>
To: David Rientjes <rientjes@google.com>,
Lars Ellenberg <drbd-dev@lists.linbit.com>
Cc: <linux-kernel@vger.kernel.org>, <drbd-user@lists.linbit.com>
Subject: Re: [patch 1/2] block, drbd: fix drbd_req_new() initialization
Date: Sat, 7 Mar 2015 17:33:55 -0700 [thread overview]
Message-ID: <54FB98F3.2050308@fb.com> (raw)
In-Reply-To: <alpine.DEB.2.10.1503071623250.31688@chino.kir.corp.google.com>
On 03/07/2015 05:24 PM, David Rientjes wrote:
> mempool_alloc() does not support __GFP_ZERO since elements may come from
> memory that has already been released by mempool_free().
>
> Remove __GFP_ZERO from mempool_alloc() in drbd_req_new() and properly
> initialize it to 0.
You should add it to mempool instead, avoid having this issue show up
for other folks as well. It'd be trivial to do. Normal ->alloc() should
honor __GFP_ZERO, just do the same manually for removing an item from
the internal pool.
--
Jens Axboe
next prev parent reply other threads:[~2015-03-12 23:08 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-08 0:24 [Drbd-dev] [patch 1/2] block, drbd: fix drbd_req_new() initialization David Rientjes
2015-03-08 0:24 ` David Rientjes
2015-03-08 0:24 ` [Drbd-dev] [patch 2/2] block, drbd: use mempool_create_slab_pool() David Rientjes
2015-03-08 0:24 ` David Rientjes
2015-03-08 0:33 ` Jens Axboe [this message]
2015-03-08 0:33 ` [patch 1/2] block, drbd: fix drbd_req_new() initialization Jens Axboe
2015-03-08 0:53 ` [Drbd-dev] " David Rientjes
2015-03-08 0:53 ` David Rientjes
2015-03-08 1:03 ` [Drbd-dev] " Jens Axboe
2015-03-08 1:03 ` Jens Axboe
2015-03-08 1:27 ` [Drbd-dev] " David Rientjes
2015-03-08 1:27 ` David Rientjes
2015-03-08 1:45 ` [Drbd-dev] " Jens Axboe
2015-03-08 1:45 ` Jens Axboe
2015-03-13 23:24 ` [Drbd-dev] " David Rientjes
2015-03-13 23:24 ` David Rientjes
2015-03-10 10:38 ` [Drbd-dev] [DRBD-user] " Lars Ellenberg
2015-03-10 10:38 ` Lars Ellenberg
2015-03-10 19:28 ` [Drbd-dev] " David Rientjes
2015-03-10 19:28 ` David Rientjes
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