[PATCH -v2] powerpc/process, kasan: Silence KASAN warnings in __get_wchan()

[Michael Ellerman]

On Thu, 20 Jan 2022 20:44:18 -0500, He Ying wrote:
> The following KASAN warning was reported in our kernel.
> 
>   BUG: KASAN: stack-out-of-bounds in get_wchan+0x188/0x250
>   Read of size 4 at addr d216f958 by task ps/14437
> 
>   CPU: 3 PID: 14437 Comm: ps Tainted: G           O      5.10.0 #1
>   Call Trace:
>   [daa63858] [c0654348] dump_stack+0x9c/0xe4 (unreliable)
>   [daa63888] [c035cf0c] print_address_description.constprop.3+0x8c/0x570
>   [daa63908] [c035d6bc] kasan_report+0x1ac/0x218
>   [daa63948] [c00496e8] get_wchan+0x188/0x250
>   [daa63978] [c0461ec8] do_task_stat+0xce8/0xe60
>   [daa63b98] [c0455ac8] proc_single_show+0x98/0x170
>   [daa63bc8] [c03cab8c] seq_read_iter+0x1ec/0x900
>   [daa63c38] [c03cb47c] seq_read+0x1dc/0x290
>   [daa63d68] [c037fc94] vfs_read+0x164/0x510
>   [daa63ea8] [c03808e4] ksys_read+0x144/0x1d0
>   [daa63f38] [c005b1dc] ret_from_syscall+0x0/0x38
>   --- interrupt: c00 at 0x8fa8f4
>       LR = 0x8fa8cc
> 
> [...]

Applied to powerpc/fixes.

[1/1] powerpc/process, kasan: Silence KASAN warnings in __get_wchan()
      https://git.kernel.org/powerpc/c/a1b29ba2f2c171b9bea73be993bfdf0a62d37d15

cheers