• Stephen Warren's avatar
    ARM: 7807/1: kexec: validate CPU hotplug support · 2103f6cb
    Stephen Warren authored
    Architectures should fully validate whether kexec is possible as part of
    machine_kexec_prepare(), so that user-space's kexec_load() operation can
    report any problems. Performing validation in machine_kexec() itself is
    too late, since it is not allowed to return.
    
    Prior to this patch, ARM's machine_kexec() was testing after-the-fact
    whether machine_kexec_prepare() was able to disable all but one CPU.
    Instead, modify machine_kexec_prepare() to validate all conditions
    necessary for machine_kexec_prepare()'s to succeed. BUG if the validation
    succeeded, yet disabling the CPUs didn't actually work.
    Signed-off-by: default avatarStephen Warren <swarren@nvidia.com>
    Acked-by: default avatar"Eric W. Biederman" <ebiederm@xmission.com>
    Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
    2103f6cb
machine_kexec.c 4.63 KB