linux-kernel - Re: [PATCH] rslib: Add scheduling points during the test

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Message-ID: <84ldr2xmz6.fsf@jogness.linutronix.de>
Date: Mon, 12 May 2025 10:22:45 +0206
From: John Ogness <john.ogness@...utronix.de>
To: Ryo Takakura <ryotkkr98@...il.com>, pmladek@...e.com
Cc: Jason@...c4.com, gregkh@...uxfoundation.org,
 linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org, lkp@...el.com,
 oe-lkp@...ts.linux.dev, oliver.sang@...el.com, ryotkkr98@...il.com
Subject: Re: [PATCH] rslib: Add scheduling points during the test

On 2025-05-10, Ryo Takakura <ryotkkr98@...il.com> wrote:
> The test has been prone to softlockup but stayed unnoticed because
> of the printk calls during the test resets the soflockup watchdog by
> calling touch_nmi_watchdog(). With the commit b63e6f60eab4 ("serial:
> 8250: Switch to nbcon console"), the printk calls no longer suppress
> the softlockup and warnings can be observed more evidently that shows
> the test needs more scheduling points.
>
> Provide scheduling points by adding cond_resched() for each test
> iteration on their up to/beyond error correction capacity.
>
> Signed-off-by: Ryo Takakura <ryotkkr98@...il.com>

FWIW:

Reviewed-by: John Ogness <john.ogness@...utronix.de>

Thanks for getting to the bottom of this.