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Subsystems that want to register CPU hotplug callbacks, as well as perform initialization for the CPUs that are already online, often do it as shown below: get_online_cpus(); for_each_online_cpu(cpu) init_cpu(cpu); register_cpu_notifier(&foobar_cpu_notifier); put_online_cpus(); This is wrong, since it is prone to ABBA deadlocks involving the cpu_add_remove_lock and the cpu_hotplug.lock (when running concurrently with CPU hotplug operations). Instead, the correct and race-free way of performing the callback registration is: cpu_notifier_register_begin(); for_each_online_cpu(cpu) init_cpu(cpu); /* Note the use of the double underscored version of the API */ __register_cpu_notifier(&foobar_cpu_notifier); cpu_notifier_register_done(); Fix the amd-bus code in x86 by using this latter form of callback registration. Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@kernel.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
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.. | ||
acpi.c | ||
amd_bus.c | ||
broadcom_bus.c | ||
bus_numa.c | ||
bus_numa.h | ||
ce4100.c | ||
common.c | ||
direct.c | ||
early.c | ||
fixup.c | ||
i386.c | ||
init.c | ||
intel_mid_pci.c | ||
irq.c | ||
legacy.c | ||
Makefile | ||
mmconfig_32.c | ||
mmconfig_64.c | ||
mmconfig-shared.c | ||
numachip.c | ||
numaq_32.c | ||
olpc.c | ||
pcbios.c | ||
sta2x11-fixup.c | ||
visws.c | ||
xen.c |