On Tue, Jun 18, 2019 at 1:31 PM Thomas Gleixner <[email protected]> wrote: > > A recent change moved the microcode loader hotplug callback into the early > startup phase, which is running with interrupts disabled. It missed that > the callbacks invoke sysfs functions which might sleep causing nice 'might > sleep' splats with proper debugging enabled. > > Split the callbacks and only load the microcode in the early startup phase > and move the sysfs handling back into the later threaded and preemptible > bringup phase where it was before. > > Fixes: 78f4e932f776 ("x86/microcode, cpuhotplug: Add a microcode loader CPU > hotplug callback") > Signed-off-by: Thomas Gleixner <[email protected]>
I ran into the bug fixed by this. For 4.19: Tested-by: Evan Green <[email protected]>
