ARM: 7807/1: kexec: validate CPU hotplug support

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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: Stephen Warren <swarren@nvidia.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

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Stephen Warren 2013-08-02 20:52:49 +01:00 • committed by Russell King

parent 00efaa0250

commit 2103f6cba6

3 changed files with 29 additions and 4 deletions

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3

arch/arm/include/asm/smp_plat.h

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20

arch/arm/kernel/machine_kexec.c

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10

arch/arm/kernel/smp.c

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