[PATCH] powerpc/code-patching: Pre-map patch area

[Michael Ellerman]

On Wed, 23 Feb 2022 12:58:21 +1100, Michael Ellerman wrote:
> Paul reported a warning with DEBUG_ATOMIC_SLEEP=y:
> 
>   BUG: sleeping function called from invalid context at include/linux/sched/mm.h:256
>   in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 1, name: swapper/0
>   preempt_count: 0, expected: 0
>   ...
>   Call Trace:
>     dump_stack_lvl+0xa0/0xec (unreliable)
>     __might_resched+0x2f4/0x310
>     kmem_cache_alloc+0x220/0x4b0
>     __pud_alloc+0x74/0x1d0
>     hash__map_kernel_page+0x2cc/0x390
>     do_patch_instruction+0x134/0x4a0
>     arch_jump_label_transform+0x64/0x78
>     __jump_label_update+0x148/0x180
>     static_key_enable_cpuslocked+0xd0/0x120
>     static_key_enable+0x30/0x50
>     check_kvm_guest+0x60/0x88
>     pSeries_smp_probe+0x54/0xb0
>     smp_prepare_cpus+0x3e0/0x430
>     kernel_init_freeable+0x20c/0x43c
>     kernel_init+0x30/0x1a0
>     ret_from_kernel_thread+0x5c/0x64
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/code-patching: Pre-map patch area
      https://git.kernel.org/powerpc/c/591b4b268435f00d2f0b81f786c2c7bd5ef66416

cheers