linux-kernel - Re: [PATCH v3] power: add an API to log wakeup reasons

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Date:	Wed, 12 Mar 2014 12:50:50 -0700
From:	Joe Perches <joe@...ches.com>
To:	Ruchi Kandoi <kandoiruchi@...gle.com>
Cc:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	rjw@...ysocki.net, ghackmann@...gle.com, john.stultz@...aro.org,
	toddpoynor@...gle.com
Subject: Re: [PATCH v3] power: add an API to log wakeup reasons

On Wed, 2014-03-12 at 12:46 -0700, Ruchi Kandoi wrote:
> For power management diagnostic purposes, it is often useful to know
> what interrupts are frequently waking the system from low power
> suspend mode, especially on battery-powered consumer electronics
> devices that are expected to spend much of their time in low-power
> suspend while not in active use.  For example, reduced battery life on
> a mobile phone may be caused in part by frequent wakeups by broadcast
> traffic on a busy wireless LAN even while the screen is off and the
> phone not in active use.

trivial note:

> diff --git a/kernel/power/wakeup_reason.c b/kernel/power/wakeup_reason.c
[]
> +#define pr_fmt(fmt) "wakeup_reason:" fmt

It's almost universal in the kernel to have a space after the :
in the prefix

#define pr_fmt(fmt) "wakeup_reason: " fmt


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