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authorMatt Evans <matt@ozlabs.org>2010-07-29 18:49:08 (GMT)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2010-07-31 05:05:22 (GMT)
commite8e5c2155b0035b6e04f29be67f6444bc914005b (patch)
tree053dc35d425029ea221abc32c0ac81f3512cd2b0 /arch/arm/configs/mx1_defconfig
parente2f7f73717c0a2927bbe7551d90b1ec47a094361 (diff)
downloadlinux-e8e5c2155b0035b6e04f29be67f6444bc914005b.tar.xz
powerpc/kexec: Fix orphaned offline CPUs across kexec
When CPU hotplug is used, some CPUs may be offline at the time a kexec is performed. The subsequent kernel may expect these CPUs to be already running, and will declare them stuck. On pseries, there's also a soft-offline (cede) state that CPUs may be in; this can also cause problems as the kexeced kernel may ask RTAS if they're online -- and RTAS would say they are. The CPU will either appear stuck, or will cause a crash as we replace its cede loop beneath it. This patch kicks each present offline CPU awake before the kexec, so that none are forever lost to these assumptions in the subsequent kernel. Now, the behaviour is that all available CPUs that were offlined are now online & usable after the kexec. This mimics the behaviour of a full reboot (on which all CPUs will be restarted). Signed-off-by: Matt Evans <matt@ozlabs.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/arm/configs/mx1_defconfig')
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