Messages in this thread | | | Date | Thu, 29 Oct 2009 15:48:03 +0100 | From | Tejun Heo <> | Subject | Re: [Bug #14467] Linker errors on ia64 with NR_CPUS=4096 |
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Christoph Lameter wrote: >> There already are two patches for this acked by Ingo/Tejun, which Tejun is >> going to take through his tree tomorrow. >> >> http://lkml.org/lkml/2009/10/27/132 > > per cpu alloc from an atomic context without passing gfp flags through to > the page allocator? That does not look right. Sure wish that the percpu > allocator would be working from atomic contexts for other cases.
It's just for sched_init() which has irq off but is not really in atomic context and does GFP_KERNEL allocations. The following comment has been added to the first patch to explain it.
+ * allocations are done using GFP_KERNEL with pcpu_lock released. In + * general, percpu memory can't be allocated with irq off but + * irqsave/restore are still used in alloc path so that it can be used + * from early init path - sched_init() specifically.
Thanks.
-- tejun
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