linux-kernel - Re: [PATCH] watchdog: Fix watchdog_nmi_enable

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Date:	Thu, 23 Apr 2015 04:30:22 -0400 (EDT)
From:	Ulrich Obergfell <uobergfe@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Don Zickus <dzickus@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] watchdog: Fix watchdog_nmi_enable_all()

> ----- Original Message -----
> From: "Andrew Morton" <akpm@...ux-foundation.org>
> To: "Don Zickus" <dzickus@...hat.com>
> Cc: "LKML" <linux-kernel@...r.kernel.org>, "Ulrich Obergfell" <uobergfe@...hat.com>
> Sent: Wednesday, April 22, 2015 10:12:01 PM
> Subject: Re: [PATCH] watchdog: Fix watchdog_nmi_enable_all()
>
> On Wed, 22 Apr 2015 10:47:49 -0400 Don Zickus <dzickus@...hat.com> wrote:
>
>> From: Ulrich Obergfell <uobergfe@...hat.com>
>> 
>> The 'watchdog_user_enabled' variable is only used as an 'interface'
>> to the /proc/sys/kernel/watchdog parameter. The actual state of the
>> watchdog is tracked by bits in the 'watchdog_enabled' variable. So,
>> watchdog_nmi_enable_all() should check the NMI_WATCHDOG_ENABLED bit
>> in 'watchdog_enabled'.
>
> What are the user-visible effects of the patch?  Please always include
> this information when fixing a bug.

Andrew,

this patch has no user-visible effects. The issue that is addressed by this
patch came up during the recent merges. It is related to:

1) https://lkml.org/lkml/2015/2/5/624
2) http://lkml.kernel.org/r/1416251225-17721-12-git-send-email-eranian@google.com

Patch series 1) changes the way how the code in kernel/watchdog.c uses certain
variables such as 'watchdog_user_enabled' and it also introduces a new variable
'watchdog_enabled' as described in:

   https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/kernel/watchdog.c?id=84d56e66b9b4a646f04ec30696ca1aeea5e654d5

This patch adjusts patch 2) which introduces watchdog_nmi_enable_all() to the
new way how the code in kernel/watchdog.c should use 'watchdog_user_enabled'
and 'watchdog_enabled'. Patch 2) is here:

  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/kernel/watchdog.c?id=b3738d29323344da3017a91010530cf3a58590fc


Regards,

Uli
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