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SubjectRe: [PATCH] Freeze bdevs when freezing processes.
Rafael J. Wysocki wrote:

> This case is a bit special. I don't think it would be right to require every
> device driver writer to avoid modifying RCU pages from the interrupt
> context, because that would break the suspend to disk ...
>
> Besides, if there is an RCU page that we _know_ we can use to store the image
> in it, we can just include this page in the image without copying. This
> already gives us one extra free page for the rest of the image and we can
> _avoid_ creating two images which suspend2 does and which adds a _lot_ of
> complexity to the code.

If you don't mind me asking... what are these RCU pages you speak of?
I couldn't work it out by grepping kernel/power/*

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