This is a note to let you know that I've just added the patch titled
blk-mq: use 'nr_cpu_ids' as highest CPU ID count for hwq <-> cpu map
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
blk-mq-use-nr_cpu_ids-as-highest-cpu-id-count-for-hwq-cpu-map.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a33c1ba2913802b6fb23e974bb2f6a4e73c8b7ce Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@xxxxxx>
Date: Mon, 24 Nov 2014 15:02:42 -0700
Subject: blk-mq: use 'nr_cpu_ids' as highest CPU ID count for hwq <-> cpu map
From: Jens Axboe <axboe@xxxxxx>
commit a33c1ba2913802b6fb23e974bb2f6a4e73c8b7ce upstream.
We currently use num_possible_cpus(), but that breaks on sparc64 where
the CPU ID space is discontig. Use nr_cpu_ids as the highest CPU ID
instead, so we don't end up reading from invalid memory.
Signed-off-by: Jens Axboe <axboe@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
block/blk-mq-cpumap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/block/blk-mq-cpumap.c
+++ b/block/blk-mq-cpumap.c
@@ -95,7 +95,7 @@ unsigned int *blk_mq_make_queue_map(stru
unsigned int *map;
/* If cpus are offline, map them to first hctx */
- map = kzalloc_node(sizeof(*map) * num_possible_cpus(), GFP_KERNEL,
+ map = kzalloc_node(sizeof(*map) * nr_cpu_ids, GFP_KERNEL,
reg->numa_node);
if (!map)
return NULL;
Patches currently in stable-queue which might be from axboe@xxxxxx are
queue-3.14/blk-mq-use-nr_cpu_ids-as-highest-cpu-id-count-for-hwq-cpu-map.patch
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