Re: [PATCH v3 2/2] watchdog/hardlockup: Avoid large stack frames in watchdog_hardlockup_check()

[Michal Hocko]

On Thu 03-08-23 16:07:58, Douglas Anderson wrote:
> After commit 77c12fc95980 ("watchdog/hardlockup: add a "cpu" param to
> watchdog_hardlockup_check()") we started storing a `struct cpumask` on
> the stack in watchdog_hardlockup_check(). On systems with
> CONFIG_NR_CPUS set to 8192 this takes up 1K on the stack. That
> triggers warnings with `CONFIG_FRAME_WARN` set to 1024.
> 
> We'll use the new trigger_allbutcpu_cpu_backtrace() to avoid needing
> to use a CPU mask at all.
> 
> Fixes: 77c12fc95980 ("watchdog/hardlockup: add a "cpu" param to watchdog_hardlockup_check()")
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> Closes: https://lore.kernel.org/r/202307310955.pLZDhpnl-lkp@xxxxxxxxx
> Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>

Acked-by: Michal Hocko <mhocko@xxxxxxxx>

Thanks!
-- 
Michal Hocko
SUSE Labs