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To: Sam Bobroff <sam.bobroff@au1.ibm.com>, linuxppc-dev@lists.ozlabs.org
From: Michael Ellerman <patch-notifications@ellerman.id.au>
Subject: Re: [1/1] powerpc/pseries: Enable RAS hotplug events late
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Date: Wed, 14 Feb 2018 16:43:47 +1100 (AEDT)
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On Mon, 2018-02-12 at 00:19:29 UTC, Sam Bobroff wrote:
> Currently if the kernel receives a memory hot-unplug event early
> enough, it may get stuck in an infinite loop in
> dissolve_free_huge_pages(). This appears as a stall just after:
> 
> pseries-hotplug-mem: Attempting to hot-remove XX LMB(s) at YYYYYYYY
> 
> It appears to be caused by "minimum_order" being uninitialized, due to
> init_ras_IRQ() executing before hugetlb_init().
> 
> To correct this, extract the part of init_ras_IRQ() that enables
> hotplug event processing and place it in the machine_late_initcall
> phase, which is guaranteed to be after hugetlb_init() is called.
> 
> Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
> Acked-by: Balbir Singh <bsingharora@gmail.com>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/c9dccf1d074a67d36c510845f66398

cheers