From: Petr Mladek <pmladek@suse.com>
To: Douglas Anderson <dianders@chromium.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Michal Hocko <mhocko@suse.com>, kernel test robot <lkp@intel.com>,
Lecopzer Chen <lecopzer.chen@mediatek.com>,
Pingfan Liu <kernelfans@gmail.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 2/2] watchdog/hardlockup: Avoid large stack frames in watchdog_hardlockup_check()
Date: Mon, 7 Aug 2023 15:39:42 +0200 [thread overview]
Message-ID: <ZND0HuR2aUt_vd3D@alley> (raw)
In-Reply-To: <20230804065935.v4.2.I501ab68cb926ee33a7c87e063d207abf09b9943c@changeid>
On Fri 2023-08-04 07:00:43, 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@intel.com>
> Closes: https://lore.kernel.org/r/202307310955.pLZDhpnl-lkp@intel.com
> Acked-by: Michal Hocko <mhocko@suse.com>
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Best Regards,
Petr
next prev parent reply other threads:[~2023-08-07 13:40 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-04 14:00 [PATCH v4 1/2] nmi_backtrace: Allow excluding an arbitrary CPU Douglas Anderson
2023-08-04 14:00 ` [PATCH v4 2/2] watchdog/hardlockup: Avoid large stack frames in watchdog_hardlockup_check() Douglas Anderson
2023-08-07 13:39 ` Petr Mladek [this message]
2023-08-07 7:35 ` [PATCH v4 1/2] nmi_backtrace: Allow excluding an arbitrary CPU Chen-Yu Tsai
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