kexec: Add kexec reboot string
The purpose is to notify the kernel module for fast reboot. Upstream a patch from the SONiC network operating system [1]. [1]: https://github.com/Azure/sonic-linux-kernel/pull/46 Link: https://lkml.kernel.org/r/20210304124626.13927-1-pmenzel@molgen.mpg.deSigned-off-by: Joe LeVeque <jolevequ@microsoft.com> Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de> Acked-by: Baoquan He <bhe@redhat.com> Cc: Guohan Lu <lguohan@gmail.com> Cc: Joe LeVeque <jolevequ@microsoft.com> Cc: Paul Menzel <pmenzel@molgen.mpg.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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