[PATCH v32 07/13] arm64: hibernate: preserve kdump image around hibernation
james.morse at arm.com
Wed Feb 15 04:12:35 PST 2017
On 07/02/17 08:08, AKASHI Takahiro wrote:
> Since arch_kexec_protect_crashkres() removes a mapping for crash dump
> kernel memory, the loaded contents won't be preserved around hibernation.
> In this patch, arch_kexec_(un)protect_crashkres() are additionally called
> before/after hibernation so that the relevant region will be mapped again
> and restored just as the other memory regions are.
Reviewed-by: James Morse <james.morse at arm.com>
A quick test of this took longer than expected (writing to a slow usb device), I
suspect it is save/restoring the whole crash region (which I don't think is a
problem). If someone turns out to use this combination of features I will look
at improving this, (almost certainly requires core-code changes).
More information about the kexec