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SubjectRe: [RFC PATCH 4/5] mm, memory_hotplug: print reason for the offlining failure

On 11/07/2018 03:48 PM, Michal Hocko wrote:
> From: Michal Hocko <>
> The memory offlining failure reporting is inconsistent and insufficient.
> Some error paths simply do not report the failure to the log at all.
> When we do report there are no details about the reason of the failure
> and there are several of them which makes memory offlining failures
> hard to debug.
> Make sure that the
> memory offlining [mem %#010llx-%#010llx] failed
> message is printed for all failures and also provide a short textual
> reason for the failure e.g.
> [ 1984.506184] rac1 kernel: memory offlining [mem 0x82600000000-0x8267fffffff] failed due to signal backoff
> this tells us that the offlining has failed because of a signal pending
> aka user intervention.
> Signed-off-by: Michal Hocko <>

It might help to enumerate these failure reason strings and use macros.

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