linux-kernel - Re: [PATCH] context_tracking: Add comments on interface and internals

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Message-ID: <87wqvdl1n8.fsf@sejong.aot.lge.com>
Date:	Wed, 16 Jan 2013 22:04:43 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Alessio Igor Bogani <abogani@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chris Metcalf <cmetcalf@...era.com>,
	Christoph Lameter <cl@...ux.com>,
	Geoff Levand <geoff@...radead.org>,
	Gilad Ben Yossef <gilad@...yossef.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Li Zhong <zhong@...ux.vnet.ibm.com>,
	Namhyung Kim <namhyung.kim@....com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] context_tracking: Add comments on interface and internals

Hi Frederic,

On Wed, 16 Jan 2013 13:32:57 +0100, Frederic Weisbecker wrote:
> This subsystem lacks many explanations on its purpose and
> design. Add these missing comments.
>
> v3: Fix the "hook" based naming as per Ingo's suggestion
[snip]
> +/**
> + * context_tracking_task_switch - context switch the syscall callbacks

To be more kernel-doc-friendly, it'd better adding descriptions for
arguments too:

 @prev: the task that is being switched out
 @next: the task we are going to switch to

Thanks,
Namhyung


> + *
> + * The context tracking uses the syscall slow path to implement its user-kernel
> + * boundaries probes on syscalls. This way it doesn't impact the syscall fast
> + * path on CPUs that don't do context tracking.
> + *
> + * But we need to clear the flag on the previous task because it may later
> + * migrate to some CPU that doesn't do the context tracking. As such the TIF
> + * flag may not be desired there.
> + */
>  void context_tracking_task_switch(struct task_struct *prev,
>  			     struct task_struct *next)
>  {
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