Re: [RFC Patch V1 01/30] mm, kernel: Use cpu_to_mem()/numa_mem_id() to support memoryless node

From: Jens Axboe
Date: Sat Jul 12 2014 - 08:32:13 EST

On 2014-07-11 09:37, Jiang Liu wrote:
When CONFIG_HAVE_MEMORYLESS_NODES is enabled, cpu_to_node()/numa_node_id()
may return a node without memory, and later cause system failure/panic
when calling kmalloc_node() and friends with returned node id.
So use cpu_to_mem()/numa_mem_id() instead to get the nearest node with
memory for the/current cpu.

If CONFIG_HAVE_MEMORYLESS_NODES is disabled, cpu_to_mem()/numa_mem_id()
is the same as cpu_to_node()/numa_node_id().

I think blk-mq requires some of the same help, as do other places in the block layer. I'll take a look at that.

As for you smp.c bits here:

Acked-by: Jens Axboe <axboe@xxxxxx>

Jens Axboe

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