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| author | Oleg Nesterov <oleg@redhat.com> | 2013-06-20 17:50:09 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-07-03 11:03:23 -0700 |
| commit | e2652ea43028e5409c2fd2b585dc8388a6e75bd0 (patch) | |
| tree | 08ce8347d42ad9be9f98b6c42b91bb9c33c31b8d /drivers/net | |
| parent | 3ddc55287a4505a5634643fec8e02f887498ffc8 (diff) | |
| download | kernel_samsung_smdk4412-e2652ea43028e5409c2fd2b585dc8388a6e75bd0.zip kernel_samsung_smdk4412-e2652ea43028e5409c2fd2b585dc8388a6e75bd0.tar.gz kernel_samsung_smdk4412-e2652ea43028e5409c2fd2b585dc8388a6e75bd0.tar.bz2 | |
hw_breakpoint: Use cpu_possible_mask in {reserve,release}_bp_slot()
commit c790b0ad23f427c7522ffed264706238c57c007e upstream.
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>
Link: http://lkml.kernel.org/r/20130620155009.GA6327@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/net')
0 files changed, 0 insertions, 0 deletions