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Message-ID: <4ECC4EE7.4020108@redhat.com>
Date: Wed, 23 Nov 2011 09:39:51 +0800
From: Dave Young <dyoung@...hat.com>
To: David Rientjes <rientjes@...gle.com>
CC: Mike Snitzer <snitzer@...hat.com>, Jens Axboe <axboe@...nel.dk>,
Linus Torvalds <torvalds@...ux-foundation.org>,
kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
stable@...r.kernel.org, linux-mm@...ck.org,
Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [patch v2 for-3.2] block: initialize request_queue's numa node
during allocation
On 11/23/2011 09:14 AM, David Rientjes wrote:
> From: Mike Snitzer <snitzer@...hat.com>
>
> struct request_queue is allocated with __GFP_ZERO so its "node" field is
> zero before initialization. This causes an oops if node 0 is offline in
> the page allocator because its zonelists are not initialized. From Dave
> Young's dmesg:
>
> SRAT: Node 1 PXM 2 0-d0000000
> SRAT: Node 1 PXM 2 100000000-330000000
> SRAT: Node 0 PXM 1 330000000-630000000
> Initmem setup node 1 0000000000000000-000000000affb000
> ...
> Built 1 zonelists in Node order, mobility grouping on.
> ...
> BUG: unable to handle kernel paging request at 0000000000001c08
> IP: [<ffffffff8111c355>] __alloc_pages_nodemask+0xb5/0x870
>
> and __alloc_pages_nodemask+0xb5 translates to a NULL pointer on
> zonelist->_zonerefs.
>
> The fix is to initialize q->node at the time of allocation so the correct
> node is passed to the slab allocator later.
>
> Since blk_init_allocated_queue_node() is no longer needed, merge it with
> blk_init_allocated_queue().
>
> [rientjes@...gle.com: changelog, initializing q->node]
> Cc: stable@...r.kernel.org [2.6.37+]
> Reported-by: Dave Young <dyoung@...hat.com>
> Signed-off-by: Mike Snitzer <snitzer@...hat.com>
> Signed-off-by: David Rientjes <rientjes@...gle.com>
Tested-by: Dave Young <dyoung@...hat.com>
> ---
> block/blk-core.c | 14 +++-----------
> include/linux/blkdev.h | 3 ---
> 2 files changed, 3 insertions(+), 14 deletions(-)
>
> diff --git a/block/blk-core.c b/block/blk-core.c
> --- a/block/blk-core.c
> +++ b/block/blk-core.c
> @@ -467,6 +467,7 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
> q->backing_dev_info.state = 0;
> q->backing_dev_info.capabilities = BDI_CAP_MAP_COPY;
> q->backing_dev_info.name = "block";
> + q->node = node_id;
>
> err = bdi_init(&q->backing_dev_info);
> if (err) {
> @@ -551,7 +552,7 @@ blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id)
> if (!uninit_q)
> return NULL;
>
> - q = blk_init_allocated_queue_node(uninit_q, rfn, lock, node_id);
> + q = blk_init_allocated_queue(uninit_q, rfn, lock);
> if (!q)
> blk_cleanup_queue(uninit_q);
>
> @@ -563,18 +564,9 @@ struct request_queue *
> blk_init_allocated_queue(struct request_queue *q, request_fn_proc *rfn,
> spinlock_t *lock)
> {
> - return blk_init_allocated_queue_node(q, rfn, lock, -1);
> -}
> -EXPORT_SYMBOL(blk_init_allocated_queue);
> -
> -struct request_queue *
> -blk_init_allocated_queue_node(struct request_queue *q, request_fn_proc *rfn,
> - spinlock_t *lock, int node_id)
> -{
> if (!q)
> return NULL;
>
> - q->node = node_id;
> if (blk_init_free_list(q))
> return NULL;
>
> @@ -604,7 +596,7 @@ blk_init_allocated_queue_node(struct request_queue *q, request_fn_proc *rfn,
>
> return NULL;
> }
> -EXPORT_SYMBOL(blk_init_allocated_queue_node);
> +EXPORT_SYMBOL(blk_init_allocated_queue);
>
> int blk_get_queue(struct request_queue *q)
> {
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -805,9 +805,6 @@ extern void blk_unprep_request(struct request *);
> */
> extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn,
> spinlock_t *lock, int node_id);
> -extern struct request_queue *blk_init_allocated_queue_node(struct request_queue *,
> - request_fn_proc *,
> - spinlock_t *, int node_id);
> extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *);
> extern struct request_queue *blk_init_allocated_queue(struct request_queue *,
> request_fn_proc *, spinlock_t *);
>
> _______________________________________________
> kexec mailing list
> kexec@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/kexec
--
Thanks
Dave
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