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Srivatsa S. Bhat 180d864632 oprofile, nmi-timer: Fix CPU hotplug callback registration ... 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 nmi-timer code in oprofile by using this latter form of callback registration. Cc: Robert Richter <rric@kernel.org> Cc: Ingo Molnar <mingo@kernel.org> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>		11 years ago
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buffer_sync.c	…
buffer_sync.h	…
cpu_buffer.c	…
cpu_buffer.h	…
event_buffer.c	…
event_buffer.h	…
nmi_timer_int.c	oprofile, nmi-timer: Fix CPU hotplug callback registration	11 years ago
oprof.c	…
oprof.h	oprofile: get rid of pointless forward declarations of struct super_block	12 years ago
oprofile_files.c	oprofilefs_create_...() do not need superblock argument	12 years ago
oprofile_perf.c	oprofilefs_create_...() do not need superblock argument	12 years ago
oprofile_stats.c	oprofilefs_create_...() do not need superblock argument	12 years ago
oprofile_stats.h	oprofile: get rid of pointless forward declarations of struct super_block	12 years ago
oprofilefs.c	oprofilefs_create_...() do not need superblock argument	12 years ago
timer_int.c	…