From: Tejun Heo <tj@kernel.org>
To: Felipe Balbi <balbi@ti.com>
Cc: Christoph Hellwig <hch@lst.de>, Joel Becker <jlbec@evilplan.org>,
Andrew Morton <akpm@linux-foundation.org>,
Pratyush Anand <pratyush.anand@gmail.com>,
target-devel@vger.kernel.org, cluster-devel@redhat.com,
ocfs2-devel@oss.oracle.com, linux-usb@vger.kernel.org,
netdev@vger.kernel.org
Subject: Re: [PATCH 02/23] usb-gadget: use per-attribute show and store methods
Date: Wed, 30 Sep 2015 12:59:34 -0400 [thread overview]
Message-ID: <20150930165934.GD2627@mtj.duckdns.org> (raw)
In-Reply-To: <20150930164301.GP32625@saruman.tx.rr.com>
On Wed, Sep 30, 2015 at 11:43:01AM -0500, Felipe Balbi wrote:
> Seems like there are *ton* of uses of container_of() wrapped within a simple
> macro. What convention are you talking about, again ?
The convention of using inline functions over macros when possible.
We don't do that all the time but that's where we wanna be in general.
> And again, what benefit is an inline function bringing in this specific
> case ? As for a technical reason, we know the macro definition will be
> copied Verbatim into the caller body. GCC might decide to not inline
> those helpers (unlikely, but could).
That's really grasping at straws. Let's not go there.
For simple stuff like container_of(), a more valid reason would be
"it's shorter and sweeter and AFAICS doesn't have any known downsides
of using macros" but this ultimately is a bike-shedding problem.
You asked where and why we said we prefer inline functions so that's
the answer (aside from individual technical advantages). It's not an
absolute rule but we're better off if we try to keep things consistent
if possible. As for this specific case, I don't know. I might do the
macro too just because it's less typing and I don't really care but at
the same time I'd just switch to inline if somebody points it out.
--
tejun
WARNING: multiple messages have this Message-ID (diff)
From: Tejun Heo <tj@kernel.org>
To: cluster-devel.redhat.com
Subject: [Cluster-devel] [PATCH 02/23] usb-gadget: use per-attribute show and store methods
Date: Wed, 30 Sep 2015 12:59:34 -0400 [thread overview]
Message-ID: <20150930165934.GD2627@mtj.duckdns.org> (raw)
In-Reply-To: <20150930164301.GP32625@saruman.tx.rr.com>
On Wed, Sep 30, 2015 at 11:43:01AM -0500, Felipe Balbi wrote:
> Seems like there are *ton* of uses of container_of() wrapped within a simple
> macro. What convention are you talking about, again ?
The convention of using inline functions over macros when possible.
We don't do that all the time but that's where we wanna be in general.
> And again, what benefit is an inline function bringing in this specific
> case ? As for a technical reason, we know the macro definition will be
> copied Verbatim into the caller body. GCC might decide to not inline
> those helpers (unlikely, but could).
That's really grasping at straws. Let's not go there.
For simple stuff like container_of(), a more valid reason would be
"it's shorter and sweeter and AFAICS doesn't have any known downsides
of using macros" but this ultimately is a bike-shedding problem.
You asked where and why we said we prefer inline functions so that's
the answer (aside from individual technical advantages). It's not an
absolute rule but we're better off if we try to keep things consistent
if possible. As for this specific case, I don't know. I might do the
macro too just because it's less typing and I don't really care but at
the same time I'd just switch to inline if somebody points it out.
--
tejun
next prev parent reply other threads:[~2015-09-30 16:59 UTC|newest]
Thread overview: 164+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-25 13:49 simplify configfs attributes Christoph Hellwig
2015-09-25 13:49 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:49 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-25 13:49 ` [PATCH 01/23] configfs: add show and store methods to struct configfs_attribute Christoph Hellwig
2015-09-25 13:49 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:49 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-25 14:28 ` Tejun Heo
2015-09-25 14:28 ` [Cluster-devel] " Tejun Heo
2015-09-25 17:41 ` Greg KH
2015-09-25 17:41 ` [Cluster-devel] " Greg KH
2015-09-25 17:41 ` [Ocfs2-devel] " Greg KH
2015-09-26 23:38 ` Nicholas A. Bellinger
2015-09-26 23:38 ` [Cluster-devel] " Nicholas A. Bellinger
2015-09-25 13:49 ` [PATCH 02/23] usb-gadget: use per-attribute show and store methods Christoph Hellwig
2015-09-25 13:49 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:49 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-27 15:47 ` Felipe Balbi
2015-09-27 15:47 ` [Cluster-devel] " Felipe Balbi
[not found] ` <20150927154752.GC16364-HgARHv6XitJaoMGHk7MhZQC/G2K4zDHf@public.gmane.org>
2015-09-28 13:33 ` Christoph Hellwig
2015-09-28 13:33 ` [Cluster-devel] " Christoph Hellwig
2015-09-28 13:33 ` [Ocfs2-devel] " Christoph Hellwig
[not found] ` <20150928133328.GA30453-jcswGhMUV9g@public.gmane.org>
2015-10-01 17:23 ` Felipe Balbi
2015-10-01 17:23 ` [Cluster-devel] " Felipe Balbi
2015-09-27 15:50 ` Felipe Balbi
2015-09-27 15:50 ` [Cluster-devel] " Felipe Balbi
2015-09-28 13:35 ` Christoph Hellwig
2015-09-28 13:35 ` [Cluster-devel] " Christoph Hellwig
2015-09-28 13:35 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-30 16:19 ` Felipe Balbi
2015-09-30 16:19 ` [Cluster-devel] " Felipe Balbi
2015-09-30 16:20 ` Tejun Heo
2015-09-30 16:20 ` [Cluster-devel] " Tejun Heo
2015-09-30 16:32 ` Felipe Balbi
2015-09-30 16:32 ` [Cluster-devel] " Felipe Balbi
2015-09-30 16:35 ` Tejun Heo
2015-09-30 16:35 ` [Cluster-devel] " Tejun Heo
2015-09-30 16:43 ` Felipe Balbi
2015-09-30 16:43 ` [Cluster-devel] " Felipe Balbi
2015-09-30 16:59 ` Tejun Heo [this message]
2015-09-30 16:59 ` Tejun Heo
[not found] ` <1443189000-13398-3-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2015-09-28 10:54 ` Andrzej Pietrasiewicz
2015-09-28 10:54 ` [Cluster-devel] " Andrzej Pietrasiewicz
2015-09-25 13:49 ` [PATCH 03/23] usb-gadget/uvc: " Christoph Hellwig
2015-09-25 13:49 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:49 ` [Ocfs2-devel] " Christoph Hellwig
[not found] ` <1443189000-13398-4-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2015-09-28 11:35 ` Andrzej Pietrasiewicz
2015-09-28 11:35 ` [Cluster-devel] " Andrzej Pietrasiewicz
2015-09-28 13:39 ` Christoph Hellwig
2015-09-28 13:39 ` [Cluster-devel] " Christoph Hellwig
2015-09-28 13:39 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-25 13:49 ` [PATCH 04/23] usb-gadget/f_hid: " Christoph Hellwig
2015-09-25 13:49 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:49 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-28 11:37 ` Andrzej Pietrasiewicz
2015-09-28 11:37 ` [Cluster-devel] " Andrzej Pietrasiewicz
2015-09-25 13:49 ` [PATCH 05/23] usb-gadget/f_acm: " Christoph Hellwig
2015-09-25 13:49 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:49 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-28 11:39 ` Andrzej Pietrasiewicz
2015-09-28 11:39 ` [Cluster-devel] " Andrzej Pietrasiewicz
2015-09-25 13:49 ` [PATCH 06/23] usb-gadget/ether: " Christoph Hellwig
2015-09-25 13:49 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:49 ` [Ocfs2-devel] " Christoph Hellwig
[not found] ` <1443189000-13398-7-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2015-09-28 11:40 ` Andrzej Pietrasiewicz
2015-09-28 11:40 ` [Cluster-devel] " Andrzej Pietrasiewicz
2015-09-25 13:49 ` [PATCH 08/23] usb-gadget/f_midi: " Christoph Hellwig
2015-09-25 13:49 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:49 ` [Ocfs2-devel] " Christoph Hellwig
[not found] ` <1443189000-13398-9-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2015-09-28 11:47 ` Andrzej Pietrasiewicz
2015-09-28 11:47 ` [Cluster-devel] " Andrzej Pietrasiewicz
2015-09-25 13:49 ` [PATCH 09/23] usb-gadget/f_printer: " Christoph Hellwig
2015-09-25 13:49 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:49 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-28 11:50 ` Andrzej Pietrasiewicz
2015-09-28 11:50 ` [Cluster-devel] " Andrzej Pietrasiewicz
2015-09-25 13:49 ` [PATCH 10/23] usb-gadget/f_sourcesink: " Christoph Hellwig
2015-09-25 13:49 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:49 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-28 11:51 ` Andrzej Pietrasiewicz
2015-09-28 11:51 ` [Cluster-devel] " Andrzej Pietrasiewicz
2015-09-25 13:49 ` [PATCH 11/23] usb-gadget/f_mass_storage: " Christoph Hellwig
2015-09-25 13:49 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:49 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-28 11:53 ` Andrzej Pietrasiewicz
2015-09-28 11:53 ` [Cluster-devel] " Andrzej Pietrasiewicz
2015-09-25 13:49 ` [PATCH 12/23] usb-gadget/f_ac1: " Christoph Hellwig
2015-09-25 13:49 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:49 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-28 11:56 ` Andrzej Pietrasiewicz
2015-09-28 11:56 ` [Cluster-devel] " Andrzej Pietrasiewicz
2015-09-25 13:49 ` [PATCH 13/23] usb-gadget/f_uac2: " Christoph Hellwig
2015-09-25 13:49 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:49 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-28 11:56 ` Andrzej Pietrasiewicz
2015-09-28 11:56 ` [Cluster-devel] " Andrzej Pietrasiewicz
2015-09-25 13:49 ` [PATCH 14/23] usb-gadget/f_obex: " Christoph Hellwig
2015-09-25 13:49 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:49 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-28 11:57 ` Andrzej Pietrasiewicz
2015-09-28 11:57 ` [Cluster-devel] " Andrzej Pietrasiewicz
2015-09-25 13:49 ` [PATCH 15/23] usb-gadget/f_phonet: " Christoph Hellwig
2015-09-25 13:49 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:49 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-28 11:59 ` Andrzej Pietrasiewicz
2015-09-28 11:59 ` [Cluster-devel] " Andrzej Pietrasiewicz
2015-09-25 13:49 ` [PATCH 16/23] usb-gadget/f_serial: " Christoph Hellwig
2015-09-25 13:49 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:49 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-28 11:59 ` Andrzej Pietrasiewicz
2015-09-28 11:59 ` [Cluster-devel] " Andrzej Pietrasiewicz
2015-09-25 13:49 ` [PATCH 17/23] dlm: " Christoph Hellwig
2015-09-25 13:49 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:49 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-28 14:49 ` David Teigland
2015-09-28 14:49 ` [Cluster-devel] " David Teigland
2015-09-28 14:49 ` [Ocfs2-devel] " David Teigland
2015-09-25 13:49 ` [PATCH 18/23] spear13xx_pcie_gadget: " Christoph Hellwig
2015-09-25 13:49 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:49 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-25 13:49 ` [PATCH 19/23] target: " Christoph Hellwig
2015-09-25 13:49 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:49 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-26 23:35 ` Nicholas A. Bellinger
2015-09-26 23:35 ` [Cluster-devel] " Nicholas A. Bellinger
[not found] ` <1443189000-13398-1-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2015-09-25 13:49 ` [PATCH 07/23] usb-gadget/f_loopback: " Christoph Hellwig
2015-09-25 13:49 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:49 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-28 11:46 ` Andrzej Pietrasiewicz
2015-09-28 11:46 ` [Cluster-devel] " Andrzej Pietrasiewicz
2015-09-28 13:41 ` Christoph Hellwig
2015-09-28 13:41 ` [Cluster-devel] " Christoph Hellwig
2015-09-28 13:41 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-28 13:52 ` Andrzej Pietrasiewicz
2015-09-28 13:52 ` [Cluster-devel] " Andrzej Pietrasiewicz
2015-09-25 13:49 ` [PATCH 20/23] netconsole: " Christoph Hellwig
2015-09-25 13:49 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:49 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-25 13:49 ` [PATCH 21/23] ocfs2/cluster: move locking into attribute " Christoph Hellwig
2015-09-25 13:49 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:49 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-25 13:57 ` simplify configfs attributes Christoph Hellwig
2015-09-25 13:57 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:57 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-25 13:49 ` [PATCH 22/23] ocfs2/cluster: use per-attribute show and store methods Christoph Hellwig
2015-09-25 13:49 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:49 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-25 13:50 ` [PATCH 23/23] configfs: remove old API Christoph Hellwig
2015-09-25 13:50 ` [Cluster-devel] " Christoph Hellwig
2015-09-25 13:50 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-28 12:06 ` Andrzej Pietrasiewicz
2015-09-28 12:06 ` [Cluster-devel] " Andrzej Pietrasiewicz
2015-09-28 13:42 ` Christoph Hellwig
2015-09-28 13:42 ` [Cluster-devel] " Christoph Hellwig
2015-09-28 13:42 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-26 23:49 ` simplify configfs attributes Nicholas A. Bellinger
2015-09-26 23:49 ` [Cluster-devel] " Nicholas A. Bellinger
2015-09-27 6:30 ` Christoph Hellwig
2015-09-27 6:30 ` [Cluster-devel] " Christoph Hellwig
2015-09-27 6:30 ` [Ocfs2-devel] " Christoph Hellwig
2015-09-28 12:12 ` Andrzej Pietrasiewicz
2015-09-28 12:12 ` [Cluster-devel] " Andrzej Pietrasiewicz
2015-10-03 13:32 simplify configfs attributes V2 Christoph Hellwig
2015-10-03 13:32 ` [PATCH 02/23] usb-gadget: use per-attribute show and store methods Christoph Hellwig
2015-10-09 21:19 ` Felipe Balbi
2015-10-11 13:10 ` Christoph Hellwig
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