linux-kernel - Re: [PATCH] vdpa: solidrun: constify pointers to hwmon_channel

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Message-ID: <20230410151532-mutt-send-email-mst@kernel.org>
Date:   Mon, 10 Apr 2023 15:16:11 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Alvaro Karsz <alvaro.karsz@...id-run.com>,
        Jason Wang <jasowang@...hat.com>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, Jean Delvare <jdelvare@...e.com>,
        linux-hwmon@...r.kernel.org
Subject: Re: [PATCH] vdpa: solidrun: constify pointers to hwmon_channel_info

On Mon, Apr 10, 2023 at 07:03:01AM -0700, Guenter Roeck wrote:
> On 4/10/23 02:56, Michael S. Tsirkin wrote:
> > On Fri, Apr 07, 2023 at 04:08:30PM -0700, Guenter Roeck wrote:
> > > On 4/7/23 08:01, Krzysztof Kozlowski wrote:
> > > > Statically allocated array of pointed to hwmon_channel_info can be made
> > > > const for safety.
> > > > 
> > > > Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> > > > 
> > > > ---
> > > > 
> > > > This depends on hwmon core patch:
> > > > https://lore.kernel.org/all/20230406203103.3011503-2-krzysztof.kozlowski@linaro.org/
> > > > 
> > > > Therefore I propose this should also go via hwmon tree.
> > > 
> > > I am not going to apply patches for 10+ subsystems through the hwmon tree.
> > > This can only result in chaos. The dependent patch is available at
> > > 
> > > git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-const
> > 
> > Doesn't it cause build errors or warnings there?
> > 
> 
> Are you saying that "hwmon: constify pointers to hwmon_channel_info" applied on its own
> on top of v6.3-rc5 (as done in above branch) causes build errors or warnings ?
> I have not seen any such reports, and I don't immediately see why that would be
> the case. Please elaborate.
> 
> Guenter


I'm not saying that, I just assumed the vdpa patch fixes build.
If build is ok we can just wait for hwmon patch to get upstream. No
rush.

> > > or wait until after the next commit window to apply this patch.
> > > 
> > > Thanks,
> > > Guenter
> > > 
> > > > 
> > > > Cc: Jean Delvare <jdelvare@...e.com>
> > > > Cc: Guenter Roeck <linux@...ck-us.net>
> > > > Cc: linux-hwmon@...r.kernel.org
> > > > ---
> > > >    drivers/vdpa/solidrun/snet_hwmon.c | 2 +-
> > > >    1 file changed, 1 insertion(+), 1 deletion(-)
> > > > 
> > > > diff --git a/drivers/vdpa/solidrun/snet_hwmon.c b/drivers/vdpa/solidrun/snet_hwmon.c
> > > > index e695e36ff753..65304354b34a 100644
> > > > --- a/drivers/vdpa/solidrun/snet_hwmon.c
> > > > +++ b/drivers/vdpa/solidrun/snet_hwmon.c
> > > > @@ -159,7 +159,7 @@ static const struct hwmon_ops snet_hwmon_ops = {
> > > >    	.read_string = snet_hwmon_read_string
> > > >    };
> > > > -static const struct hwmon_channel_info *snet_hwmon_info[] = {
> > > > +static const struct hwmon_channel_info * const snet_hwmon_info[] = {
> > > >    	HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_LABEL,
> > > >    			   HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_LABEL),
> > > >    	HWMON_CHANNEL_INFO(power, HWMON_P_INPUT | HWMON_P_LABEL),
> >