On Wed, 16 Sep 2020 17:45:30 +0200, Andrew Jones wrote:
> Steal time initialization requires mapping a memory region which
> invokes a memory allocation. Doing this at CPU starting time results
> in the following trace when CONFIG_DEBUG_ATOMIC_SLEEP is enabled:
>
> BUG: sleeping function called from invalid context at mm/slab.h:498
> in_atomic(): 1, irqs_disabled(): 128, non_block: 0, pid: 0, name: swapper/1
> CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.9.0-rc5+ #1
> Call trace:
> dump_backtrace+0x0/0x208
> show_stack+0x1c/0x28
> dump_stack+0xc4/0x11c
> ___might_sleep+0xf8/0x130
> __might_sleep+0x58/0x90
> slab_pre_alloc_hook.constprop.101+0xd0/0x118
> kmem_cache_alloc_node_trace+0x84/0x270
> __get_vm_area_node+0x88/0x210
> get_vm_area_caller+0x38/0x40
> __ioremap_caller+0x70/0xf8
> ioremap_cache+0x78/0xb0
> memremap+0x9c/0x1a8
> init_stolen_time_cpu+0x54/0xf0
> cpuhp_invoke_callback+0xa8/0x720
> notify_cpu_starting+0xc8/0xd8
> secondary_start_kernel+0x114/0x180
> CPU1: Booted secondary processor 0x0000000001 [0x431f0a11]
>
> [...]
Applied to arm64 (for-next/fixes), thanks!
[1/1] arm64: paravirt: Initialize steal time when cpu is online
https://git.kernel.org/arm64/c/75df529bec91
--
Catalin
_______________________________________________
kvmarm mailing list
kvmarm@xxxxxxxxxxxxxxxxxxxxx
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
