From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Paul Cercueil <paul@crapouillou.net>,
Guenter Roeck <linux@roeck-us.net>,
Wim Van Sebroeck <wim@linux-watchdog.org>
Cc: od@zcrc.me, linux-watchdog@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 4/4] watchdog: jz4740: Make probe function __init_or_module
Date: Sat, 8 Jun 2019 09:51:45 +0200 [thread overview]
Message-ID: <0dc0fd0a-54fc-5d70-af78-1874b5ece418@c-s.fr> (raw)
In-Reply-To: <20190607162429.17915-5-paul@crapouillou.net>
Hi Paul,
Le 07/06/2019 à 18:24, Paul Cercueil a écrit :
> This allows the probe function to be dropped after the kernel finished
> its initialization, in the case where the driver was not compiled as a
> module.
I'm not sure that's what __init_or_module flag does.
As far as I understand, this flag makes the function being dropped only
when the kernel is built without modules support, ie without
CONFIG_MODULES. See
https://elixir.bootlin.com/linux/latest/source/include/linux/module.h#L145
In addition, I'm not sure you can simply define a probe function as
__init. What if someone tries to unbind and rebind the device through
sysfs for instance ?
It seems there is a special function called __platform_driver_probe()
for registering devices when the probe function is to be in __init, see
https://elixir.bootlin.com/linux/latest/source/drivers/base/platform.c#L684
Christophe
>
> Signed-off-by: Paul Cercueil <paul@crapouillou.net>
> ---
>
> Notes:
> v2: New patch
>
> drivers/watchdog/jz4740_wdt.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/watchdog/jz4740_wdt.c b/drivers/watchdog/jz4740_wdt.c
> index 7519d80c5d05..2061788c1939 100644
> --- a/drivers/watchdog/jz4740_wdt.c
> +++ b/drivers/watchdog/jz4740_wdt.c
> @@ -157,7 +157,7 @@ static const struct of_device_id jz4740_wdt_of_matches[] = {
> MODULE_DEVICE_TABLE(of, jz4740_wdt_of_matches);
> #endif
>
> -static int jz4740_wdt_probe(struct platform_device *pdev)
> +static int __init_or_module jz4740_wdt_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> struct jz4740_wdt_drvdata *drvdata;
>
next prev parent reply other threads:[~2019-06-08 7:51 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-07 16:24 [PATCH v2 0/4] JZ4740 watchdog cleanups Paul Cercueil
2019-06-07 16:24 ` [PATCH v2 1/4] watchdog: jz4740: Use register names from <linux/mfd/ingenic-tcu.h> Paul Cercueil
2019-06-07 16:24 ` [PATCH v2 2/4] watchdog: jz4740: Avoid starting watchdog in set_timeout Paul Cercueil
2019-06-07 16:24 ` [PATCH v2 3/4] watchdog: jz4740: Drop dependency on MACH_JZ47xx Paul Cercueil
2019-06-07 16:24 ` [PATCH v2 4/4] watchdog: jz4740: Make probe function __init_or_module Paul Cercueil
2019-06-07 17:29 ` Guenter Roeck
2019-06-08 7:51 ` Christophe Leroy [this message]
2019-06-08 9:57 ` Paul Cercueil
2019-06-11 5:16 ` Christophe Leroy
2019-06-11 11:02 ` Guenter Roeck
Reply instructions:
You may reply publicly 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=0dc0fd0a-54fc-5d70-af78-1874b5ece418@c-s.fr \
--to=christophe.leroy@c-s.fr \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-watchdog@vger.kernel.org \
--cc=linux@roeck-us.net \
--cc=od@zcrc.me \
--cc=paul@crapouillou.net \
--cc=wim@linux-watchdog.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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).