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From: Vlastimil Babka <vbabka@suse.cz>
To: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Luis Chamberlain <mcgrof@kernel.org>,
	Kees Cook <keescook@chromium.org>,
	Iurii Zaikin <yzaikin@google.com>,
	linux-kernel@vger.kernel.org, linux-api@vger.kernel.org,
	linux-mm@kvack.org, Ivan Teterevkov <ivan.teterevkov@nutanix.com>,
	Michal Hocko <mhocko@kernel.org>,
	David Rientjes <rientjes@google.com>,
	Matthew Wilcox <willy@infradead.org>,
	"Eric W . Biederman" <ebiederm@xmission.com>,
	"Guilherme G . Piccoli" <gpiccoli@canonical.com>,
	Alexey Dobriyan <adobriyan@gmail.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Christian Brauner <christian.brauner@ubuntu.com>
Subject: Re: [PATCH 3/3] kernel/hung_task convert hung_task_panic boot parameter to sysctl
Date: Wed, 1 Apr 2020 10:47:07 +0200	[thread overview]
Message-ID: <9a11d5c9-b830-040e-219a-64cdb24a9236@suse.cz> (raw)
In-Reply-To: <2ee52caa-0257-19bd-28ef-60a2b4041a8d@I-love.SAKURA.ne.jp>

On 4/1/20 1:12 AM, Tetsuo Handa wrote:
> On 2020/03/30 20:55, Vlastimil Babka wrote:
>> @@ -63,16 +63,6 @@ static struct task_struct *watchdog_task;
>>  unsigned int __read_mostly sysctl_hung_task_panic =
>>  				CONFIG_BOOTPARAM_HUNG_TASK_PANIC_VALUE;
>>  
>> -static int __init hung_task_panic_setup(char *str)
>> -{
>> -	int rc = kstrtouint(str, 0, &sysctl_hung_task_panic);
>> -
>> -	if (rc)
>> -		return rc;
>> -	return 1;
>> -}
>> -__setup("hung_task_panic=", hung_task_panic_setup);
> 
> Can we defer removal of this handler for "one release cycle" (and instead emit a line
> saying that "this parameter will be replaced by ..." during that cycle) ? I welcome

The old parameter is not removed, it's just handled differently, see patch 2.
Both old name and new sysctl.name will work.

> PATCH 1/3, but kernel testing projects (e.g. syzbot) needs to update their settings
> between PATCH 1/3 was merged into linux.git and PATCH 3/3 is merged into linux.git .
> 
> https://lkml.kernel.org/r/CACT4Y+YE-j5ncjTGN6UhngfCNRgVo-QDZ3VCBGACdbs9-v+axQ@mail.gmail.com says
> "Announcing unmerged changes is too early (as this patch showed). And once it's in linux-next it's already too late.."
> 
>> -
>>  static int
>>  hung_task_panic(struct notifier_block *this, unsigned long event, void *ptr)
>>  {
>> 
> 


      reply	other threads:[~2020-04-01  8:47 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-30 11:55 [PATCH 0/3] support setting sysctl parameters from kernel command line Vlastimil Babka
2020-03-30 11:55 ` [PATCH 1/3] kernel/sysctl: " Vlastimil Babka
2020-03-30 16:23   ` Vlastimil Babka
2020-03-30 17:40     ` Kees Cook
2020-03-30 17:39   ` Kees Cook
2020-03-30 20:15   ` kbuild test robot
2020-03-31 18:29     ` Kees Cook
2020-03-30 22:44   ` Luis Chamberlain
2020-03-31  7:42     ` Vlastimil Babka
2020-03-31  7:48       ` Michal Hocko
2020-03-31 18:26         ` Kees Cook
2020-03-31 14:31       ` Luis Chamberlain
2020-04-01 11:01     ` Vlastimil Babka
2020-04-02 16:04       ` Luis Chamberlain
2020-04-02 17:23         ` Kees Cook
2020-04-02 20:59           ` Luis Chamberlain
2020-04-03 23:57             ` Kees Cook
2020-04-06 14:08               ` Luis Chamberlain
2020-04-06 15:58                 ` Kees Cook
2020-04-06 17:08                   ` Luis Chamberlain
2020-04-14 11:25                     ` Vlastimil Babka
2020-04-15  3:23                       ` Masami Hiramatsu
2020-04-15  6:08                       ` Luis Chamberlain
2020-03-30 11:55 ` [PATCH 2/3] kernel/sysctl: support handling command line aliases Vlastimil Babka
2020-03-30 17:41   ` Kees Cook
2020-03-31 14:35   ` Luis Chamberlain
2020-03-30 11:55 ` [PATCH 3/3] kernel/hung_task convert hung_task_panic boot parameter to sysctl Vlastimil Babka
2020-03-30 17:43   ` Kees Cook
2020-03-31  0:34     ` John Hubbard
2020-03-31  7:27       ` Vlastimil Babka
2020-03-31 15:49         ` John Hubbard
2020-03-31 23:12   ` Tetsuo Handa
2020-04-01  8:47     ` Vlastimil Babka [this message]

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