Commits
Alex Shi committed 6240a10dc55
cpuidle / ACPI: recover percpu ACPI processor cstate Commit ac3ebafa81af76d6 "ACPI / idle: remove usage of the statedata" changed the percpu processor cstate to a unified cstate in ACPI idle. That caused all our NHM boxes to boot hang or panic. 2178751 Task dump for CPU 1: 2178752 swapper/1 R running task 6736 0 1 0x00000000 2178753 ffff8801e8029dc8 ffffffff8101cf96 ffff8801e8029e28 ffffffff813d294b 2178754 0000000000000f99 0000000000000003 00000000003cf654 0000000025c17d03 2178755 ffff8801e8029e38 ffff8801e74fc000 00000002590dc5c4 ffffffff8163cdb0 2178756 Call Trace: 2178757 [<ffffffff8101cf96>] ? acpi_processor_ffh_cstate_enter+0x2d/0x2f 2178758 [<ffffffff813d294b>] acpi_idle_enter_bm+0x1b1/0x236 2178759 [<ffffffff8163cdb0>] ? disable_cpuidle+0x10/0x10 2178760 [<ffffffff8163cdc2>] cpuidle_enter+0x12/0x14 2178761 [<ffffffff8163d286>] cpuidle_wrap_enter+0x2f/0x6d 2178762 [<ffffffff8163d2d4>] cpuidle_enter_tk+0x10/0x12 2178763 [<ffffffff8163cdd6>] cpuidle_enter_state+0x12/0x3a 2178764 [<ffffffff8163d4a7>] cpuidle_idle_call+0xe8/0x161 2178765 [<ffffffff81008d99>] cpu_idle+0x5e/0xa4 2178766 [<ffffffff8174c6c1>] start_secondary+0x1a9/0x1ad 2178767 Task dump for CPU 2: In fact, the ACPI idle is based on the assumption of difference percpu cstate structures that are necessary for the implementation to work cprrectly. A unique acpi_processor_cx is not sifficient by far. This patch is just a quick fix re-introducing the percpu cstates. If someone really wants to unify the ACPI cstates, please make sure that the whole software infrastructure is changed and take hardware as well as many different kinds of BIOS settings into account. [rjw: Changelog] Reported-by: LKP project <lkp@linux.intel.com> Reported-by: Xie ChanglongX <changlongx.xie@intel.com> Tested-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Alex Shi <alex.shi@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>