Linux-ARM-MSM Archive on lore.kernel.org
 help / color / Atom feed
From: Marc Gonzalez <marc.w.gonzalez@free.fr>
To: "Uwe Kleine-König" <uwe@kleine-koenig.org>,
	"Antti Palosaari" <crope@iki.fi>,
	"Brad Love" <brad@nextdimension.cc>, "Sean Young" <sean@mess.org>
Cc: "Mauro Carvalho Chehab" <mchehab@kernel.org>,
	"Jonathan Neuschäfer" <j.neuschaefer@gmx.net>,
	linux-media <linux-media@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	MSM <linux-arm-msm@vger.kernel.org>,
	"Bjorn Andersson" <bjorn.andersson@linaro.org>
Subject: Re: [PATCH v3] media: si2168: Refactor command setup code
Date: Fri, 12 Jul 2019 11:37:42 +0200
Message-ID: <b84104ca-6e4e-24ee-91e0-56aebd036a48@free.fr> (raw)
In-Reply-To: <20190712084343.GA28962@taurus.defre.kleine-koenig.org>

+ Sean

On 12/07/2019 10:43, Uwe Kleine-König wrote:

> On Thu, Jul 04, 2019 at 12:33:22PM +0200, Marc Gonzalez wrote:
>
>> Refactor the command setup code, and let the compiler determine
>> the size of each command.
>>
>> Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
>> Signed-off-by: Marc Gonzalez <marc.w.gonzalez@free.fr>
>> ---
>> Changes from v1:
>> - Use a real function to populate struct si2168_cmd *cmd, and a trivial
>> macro wrapping it (macro because sizeof).
>> Changes from v2:
>> - Fix header mess
>> - Add Jonathan's tag
>> ---
>>  drivers/media/dvb-frontends/si2168.c | 146 +++++++++------------------
>>  1 file changed, 45 insertions(+), 101 deletions(-)
>>
>> diff --git a/drivers/media/dvb-frontends/si2168.c b/drivers/media/dvb-frontends/si2168.c
>> index c64b360ce6b5..5e81e076369c 100644
>> --- a/drivers/media/dvb-frontends/si2168.c
>> +++ b/drivers/media/dvb-frontends/si2168.c
>> @@ -12,6 +12,16 @@
>>  
>>  static const struct dvb_frontend_ops si2168_ops;
>>  
>> +static void cmd_setup(struct si2168_cmd *cmd, char *args, int wlen, int rlen)
> 
> I'd add an "inline" here. And you could add a const for *args.

I was under the (vague) impression that it's better to let the compiler
decide when to inline, except for trivial alternatives in headers.
David Miller wrote: "Please do not use the inline directive in foo.c
files, let the compiler decide."

Antti, Sean, what do you think?

For my notes: https://gcc.gnu.org/onlinedocs/gcc/Inline.html


>> +{
>> +	memcpy(cmd->args, args, wlen);
>> +	cmd->wlen = wlen;
>> +	cmd->rlen = rlen;
>> +}
>> +
>> +#define CMD_SETUP(cmd, args, rlen) \
>> +	cmd_setup(cmd, args, sizeof(args) - 1, rlen)
> 
> Here is the chance to add some static checking. Also it is a good habit
> to put parens around macro arguments.

Wrt parens around arguments, I figured they are not required here, since they
are used as function arguments. Though you may have a valid point.

Antti, Sean?


> Something like:
> 
> #define CMD_SETUP(cmd, args, rlen) ({ \
> 	BUILD_BUG_ON(sizeof((args)) - 1 > SI2168_ARGLEN);
> 	cmd_setup((cmd), (args), __must_be_array((args)) + sizeof((args)) - 1, (rlen));
> 
> Maybe let this macro live in drivers/media/dvb-frontends/si2168_priv.h
> where struct si2168_cmd is defined?

Antti, Sean?


> I looked over the transformations in the rest of the patch and this
> looks good.

Thanks for taking a look!

Regards.

  reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-04 10:33 Marc Gonzalez
2019-07-12  8:43 ` Uwe Kleine-König
2019-07-12  9:37   ` Marc Gonzalez [this message]
2019-07-12 15:47 ` Brad Love
2019-07-12 17:45   ` Mauro Carvalho Chehab
2019-07-12 22:11     ` Marc Gonzalez
2019-07-13 10:02       ` Mauro Carvalho Chehab
2019-07-14 18:31         ` Matthias Schwarzott
2019-07-12 21:41   ` Marc Gonzalez

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=b84104ca-6e4e-24ee-91e0-56aebd036a48@free.fr \
    --to=marc.w.gonzalez@free.fr \
    --cc=bjorn.andersson@linaro.org \
    --cc=brad@nextdimension.cc \
    --cc=crope@iki.fi \
    --cc=j.neuschaefer@gmx.net \
    --cc=linux-arm-msm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-media@vger.kernel.org \
    --cc=mchehab@kernel.org \
    --cc=sean@mess.org \
    --cc=uwe@kleine-koenig.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-ARM-MSM Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-arm-msm/0 linux-arm-msm/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-arm-msm linux-arm-msm/ https://lore.kernel.org/linux-arm-msm \
		linux-arm-msm@vger.kernel.org linux-arm-msm@archiver.kernel.org
	public-inbox-index linux-arm-msm


Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-arm-msm


AGPL code for this site: git clone https://public-inbox.org/ public-inbox