linux-kernel - Re: [PATCH 4.19 130/133] printk: queue wake_up_klogd irq

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Message-ID: <20200721020322.GA715296@jagdpanzerIV.localdomain>
Date:   Tue, 21 Jul 2020 11:03:22 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Pavel Machek <pavel@...x.de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Lech Perczak <l.perczak@...lintechnologies.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Jann Horn <jannh@...gle.com>, Petr Mladek <pmladek@...e.com>,
        Theodore Tso <tytso@....edu>,
        John Ogness <john.ogness@...utronix.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 4.19 130/133] printk: queue wake_up_klogd irq_work only
 if per-CPU areas are ready

On (20/07/21 00:05), Pavel Machek wrote:
> > From: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> > 
> > commit ab6f762f0f53162d41497708b33c9a3236d3609e upstream.
> > 
[..]
> 
> Is this still needed in 4.19? 1b710b1b10ef was reverted in 4.19, so
> there should not be any user-visible problems...

printk_deferred() is still broken and we had similar bug reports which
where not caused by 1b710b1b10ef

	-ss