diff options
| author | Thomas Gleixner <[email protected]> | 2017-08-15 13:03:47 +0200 |
|---|---|---|
| committer | Thomas Gleixner <[email protected]> | 2017-08-15 13:03:47 +0200 |
| commit | 84393817db09bb436e934f8f8cc981cbca9ea4dc (patch) | |
| tree | 90759da335f746a81f1019271bfb75370dc38314 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | b45e4c45b13275a6b4a3f83ae8301a1963fbe5d0 (diff) | |
x86/mtrr: Prevent CPU hotplug lock recursion
Larry reported a CPU hotplug lock recursion in the MTRR code.
============================================
WARNING: possible recursive locking detected
systemd-udevd/153 is trying to acquire lock:
(cpu_hotplug_lock.rw_sem){.+.+.+}, at: [<c030fc26>] stop_machine+0x16/0x30
but task is already holding lock:
(cpu_hotplug_lock.rw_sem){.+.+.+}, at: [<c0234353>] mtrr_add_page+0x83/0x470
....
cpus_read_lock+0x48/0x90
stop_machine+0x16/0x30
mtrr_add_page+0x18b/0x470
mtrr_add+0x3e/0x70
mtrr_add_page() holds the hotplug rwsem already and calls stop_machine()
which acquires it again.
Call stop_machine_cpuslocked() instead.
Reported-and-tested-by: Larry Finger <[email protected]>
Reported-by: Dmitry Vyukov <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1708140920250.1865@nanos
Cc: "Paul E. McKenney" <[email protected]>
Cc: Borislav Petkov <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions