linux/kernel/events
Oleg Nesterov c790b0ad23 hw_breakpoint: Use cpu_possible_mask in {reserve,release}_bp_slot()
fetch_bp_busy_slots() and toggle_bp_slot() use
for_each_online_cpu(), this is obviously wrong wrt cpu_up() or
cpu_down(), we can over/under account the per-cpu numbers.

For example:

	# echo 0 >> /sys/devices/system/cpu/cpu1/online
	# perf record -e mem:0x10 -p 1 &
	# echo 1 >> /sys/devices/system/cpu/cpu1/online
	# perf record -e mem:0x10,mem:0x10,mem:0x10,mem:0x10 -C1 -a &
	# taskset -p 0x2 1

triggers the same WARN_ONCE("Can't find any breakpoint slot") in
arch_install_hw_breakpoint().

Reported-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: <stable@vger.kernel.org>
Link: http://lkml.kernel.org/r/20130620155009.GA6327@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2013-06-20 17:57:01 +02:00
..
Makefile uprobes: Move to kernel/events/ 2012-02-22 11:08:00 +01:00
callchain.c perf: Add attribute to filter out callchains 2012-08-10 12:40:57 -03:00
core.c perf: Fix mmap() accounting hole 2013-06-19 12:44:13 +02:00
hw_breakpoint.c hw_breakpoint: Use cpu_possible_mask in {reserve,release}_bp_slot() 2013-06-20 17:57:01 +02:00
internal.h perf: Fix mmap() accounting hole 2013-06-19 12:44:13 +02:00
ring_buffer.c perf: Fix vmalloc ring buffer pages handling 2013-05-01 12:34:46 +02:00
uprobes.c uretprobes: Remove -ENOSYS as return probes implemented 2013-04-13 15:31:58 +02:00