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Date: Wed, 23 Apr 2014 07:32:13 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Jiang Liu <jiang.liu@...ux.intel.com> Cc: Andrew Morton <akpm@...ux-foundation.org>, Ingo Molnar <mingo@...nel.org>, Ingo Molnar <mingo@...hat.com>, "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>, Tony Luck <tony.luck@...el.com>, linux-kernel@...r.kernel.org Subject: Re: [Bugfix] sched: fix possible invalid memory access caused by CPU hot-addition On Wed, Apr 23, 2014 at 10:45:13AM +0800, Jiang Liu wrote: > Hi Peter, > It's not for memoryless node, but to solve a race window > in CPU hot-addition. The related CPU hot-addition flow is: > 1) Handle CPU hot-addition event > 1.a) gather platform specific information > 1.b) associate hot-added CPU with a node > 1.c) create CPU device > 2) User online hot-added CPUs through sysfs: > 2.a) cpu_up() > 2.b) ->try_online_node() > 2.c) ->hotadd_new_pgdat() > 2.d) ->node_set_online() > > So between 1.b and 2.c, kmalloc_node(nid) may cause invalid > memory access without the node_online(nid) check. Any why was all this not in the Changelog? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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