linux-kernel - Re: [PATCH] debugfs: Fix debugfs_read_file

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Date:   Fri, 4 Jun 2021 10:39:43 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Dietmar Eggemann <dietmar.eggemann@....com>
Cc:     Ingo Molnar <mingo@...hat.com>, Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Valentin Schneider <valentin.schneider@....com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] debugfs: Fix debugfs_read_file_str()

On Thu, May 27, 2021 at 11:11:05AM +0200, Dietmar Eggemann wrote:
> Read the entire size of the buffer, including the trailing new line
> character.
> Discovered while reading the sched domain names of CPU0:
> 
> before:
> 
> cat /sys/kernel/debug/sched/domains/cpu0/domain*/name
> SMTMCDIE
> 
> after:
> 
> cat /sys/kernel/debug/sched/domains/cpu0/domain*/name
> SMT
> MC
> DIE
> 
> Fixes: 9af0440ec86eb ("debugfs: Implement debugfs_create_str()")
> Signed-off-by: Dietmar Eggemann <dietmar.eggemann@....com>

Urgh.. so much for last minute changes :/

Greg, AFAICT that commit has since landed in Linus, will you take care
of this?

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>