Re: [PATCH] x86/microcode, cpuhotplug: move microcode hotplug callback after cpu teardown

On Wed, 3 Jul 2019, Song liwei wrote: > After CPUHP_TEARDOWN_CPU callback was invoked, the context will become > atomic and IRQ disabled, while mc_cpu_down_prep will called > kernfs_find_and_get_ns which will try to acquire mutext lock which may > sleep. > > Adjust CPUHP_AP_MICROCODE_LOADER callb

[PATCH] x86/microcode, cpuhotplug: move microcode hotplug callback after cpu teardown

From: Liwei Song Fix the following BUG: [ 236.599792] BUG: sleeping function called from invalid context at kernel/locking/mutex.c:255 [ 236.599796] in_atomic(): 1, irqs_disabled(): 1, pid: 14, name: migration/1 [ 236.599798] Preemption disabled at: [ 236.599807] [] cpu_stopper_thread+0x71/