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From: Peter Zijlstra <peterz@infradead.org>
To: Greg KH <greg@kroah.com>
Cc: mingo@kernel.org, mgorman@suse.de, juri.lelli@redhat.com,
	vincent.guittot@linaro.org, dietmar.eggemann@arm.com,
	rostedt@goodmis.org, bsegall@google.com, bristot@redhat.com,
	joshdon@google.com, valentin.schneider@arm.com,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 6/9] debugfs: Implement debugfs_create_str()
Date: Fri, 26 Mar 2021 12:18:47 +0100	[thread overview]
Message-ID: <YF3DF+T8nPRgt7Ao@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <YF2/41K4xs3ZOQdV@kroah.com>

On Fri, Mar 26, 2021 at 12:05:07PM +0100, Greg KH wrote:
> On Fri, Mar 26, 2021 at 11:33:58AM +0100, Peter Zijlstra wrote:
> > 
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> 
> No changelog text?  :(

Yeah, didn't really know what to say that the Subject didn't already do.

> > +/**
> > + * debugfs_create_str - create a debugfs file that is used to read and write a string value
> > + * @name: a pointer to a string containing the name of the file to create.
> > + * @mode: the permission that the file should have
> > + * @parent: a pointer to the parent dentry for this file.  This should be a
> > + *          directory dentry if set.  If this parameter is %NULL, then the
> > + *          file will be created in the root of the debugfs filesystem.
> > + * @value: a pointer to the variable that the file should read to and write
> > + *         from.
> > + *
> > + * This function creates a file in debugfs with the given name that
> > + * contains the value of the variable @value.  If the @mode variable is so
> > + * set, it can be read from, and written to.
> > + *
> > + * This function will return a pointer to a dentry if it succeeds.  This
> > + * pointer must be passed to the debugfs_remove() function when the file is
> > + * to be removed (no automatic cleanup happens if your module is unloaded,
> > + * you are responsible here.)  If an error occurs, ERR_PTR(-ERROR) will be
> > + * returned.
> > + *
> > + * NOTE: when writing is enabled it will replace the string, string lifetime is
> > + * assumed to be RCU managed.
> > + *
> > + * If debugfs is not enabled in the kernel, the value ERR_PTR(-ENODEV) will
> > + * be returned.
> > + */
> > +struct dentry *debugfs_create_str(const char *name, umode_t mode,
> > +				   struct dentry *parent, char **value)
> 
> Please have this return void, no need for me to have to clean up
> afterward later on :)

That would make it inconsistent with debugfs_create_{bool,blob}() from
which I copiously 'borrowed'.

Also, the return dentry might be useful with debugfs_create_symlink(),
but you're right in that most other create_file wrappers return void.

  reply	other threads:[~2021-03-26 11:20 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-26 10:33 [PATCH 0/9] sched: Clean up SCHED_DEBUG Peter Zijlstra
2021-03-26 10:33 ` [PATCH 1/9] sched/numa: Allow runtime enabling/disabling of NUMA balance without SCHED_DEBUG Peter Zijlstra
2021-03-26 10:33 ` [PATCH 2/9] sched: Remove sched_schedstats sysctl out from under SCHED_DEBUG Peter Zijlstra
2021-03-26 10:33 ` [PATCH 3/9] sched: Dont make LATENCYTOP select SCHED_DEBUG Peter Zijlstra
2021-03-26 10:33 ` [PATCH 4/9] sched: Move SCHED_DEBUG to debugfs Peter Zijlstra
2021-03-26 11:06   ` Greg KH
2021-04-07 10:46   ` Valentin Schneider
2021-04-07 12:26     ` Peter Zijlstra
2021-04-07 12:57       ` Valentin Schneider
2021-03-26 10:33 ` [PATCH 5/9] sched,preempt: Move preempt_dynamic to debug.c Peter Zijlstra
2021-03-26 10:33 ` [PATCH 6/9] debugfs: Implement debugfs_create_str() Peter Zijlstra
2021-03-26 11:05   ` Greg KH
2021-03-26 11:18     ` Peter Zijlstra [this message]
2021-03-26 11:30       ` Greg KH
2021-03-26 11:38         ` [PATCH v2 " Peter Zijlstra
2021-03-26 12:18           ` Greg KH
2021-03-26 12:53           ` Rasmus Villemoes
2021-03-26 12:57             ` Greg KH
2021-03-26 13:10               ` Rasmus Villemoes
2021-03-26 14:12                 ` Peter Zijlstra
2021-03-26 14:19                   ` Greg KH
2021-03-26 14:22             ` Peter Zijlstra
2021-03-26 14:58               ` Rasmus Villemoes
2021-03-26 15:19                 ` Peter Zijlstra
2021-03-27 10:41                   ` Greg KH
2021-03-26 14:50   ` [PATCH v3 " Peter Zijlstra
2021-03-27 10:42     ` Greg KH
2021-03-27 22:24   ` [PATCH " Al Viro
2021-03-28  0:33     ` Steven Rostedt
2021-03-26 10:33 ` [PATCH 7/9] sched,debug: Convert sysctl sched_domains to debugfs Peter Zijlstra
2021-03-26 13:11   ` Dietmar Eggemann
2021-04-07 10:46   ` Valentin Schneider
2021-04-07 12:18     ` Peter Zijlstra
2021-03-26 10:34 ` [PATCH 8/9] sched: Move /proc/sched_debug " Peter Zijlstra
2021-03-26 11:05   ` Greg KH
2021-03-26 10:34 ` [PATCH 9/9] sched,fair: Alternative sched_slice() Peter Zijlstra
2021-03-26 12:08   ` Dietmar Eggemann
2021-03-26 14:07     ` Peter Zijlstra
2021-03-26 15:37   ` Vincent Guittot
2021-03-26 18:30     ` Peter Zijlstra

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