netdev - Re: [PATCH iwl-next] i40e: Avoid unnecessary use of comma operator

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Message-ID: <20231218190055.GB2863043@dev-arch.thelio-3990X>
Date: Mon, 18 Dec 2023 12:00:55 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Nick Desaulniers <ndesaulniers@...gle.com>
Cc: Simon Horman <horms@...nel.org>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Tony Nguyen <anthony.l.nguyen@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	llvm@...ts.linux.dev
Subject: Re: [PATCH iwl-next] i40e: Avoid unnecessary use of comma operator

On Mon, Dec 18, 2023 at 08:32:28AM -0800, Nick Desaulniers wrote:
> On Sun, Dec 17, 2023 at 1:45 AM Simon Horman <horms@...nel.org> wrote:
> >
> > Although it does not seem to have any untoward side-effects,
> > the use of ';' to separate to assignments seems more appropriate than ','.
> >
> > Flagged by clang-17 -Wcomma
> 
> Yikes! This kind of example is why I hate the comma operator!
> 
> Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
> 
> (Is -Wcomma enabled by -Wall?)

No and last time that I looked into enabling it, there were a lot of
instances in the kernel:

https://lore.kernel.org/20230630192825.GA2745548@dev-arch.thelio-3990X/

It is still probably worth pursuing at some point but that is a lot of
instances to clean up (along with potentially having a decent amount of
pushback depending on the changes necessary to eliminate all instances).

> Is there a fixes tag we can add?
> 
> >
> > No functional change intended.
> > Compile tested only.
> >
> > Signed-off-by: Simon Horman <horms@...nel.org>
> > ---
> >  drivers/net/ethernet/intel/i40e/i40e_ethtool.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
> > index 812d04747bd0..f542f2671957 100644
> > --- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
> > +++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
> > @@ -1917,7 +1917,7 @@ int i40e_get_eeprom(struct net_device *netdev,
> >                         len = eeprom->len - (I40E_NVM_SECTOR_SIZE * i);
> >                         last = true;
> >                 }
> > -               offset = eeprom->offset + (I40E_NVM_SECTOR_SIZE * i),
> > +               offset = eeprom->offset + (I40E_NVM_SECTOR_SIZE * i);
> >                 ret_val = i40e_aq_read_nvm(hw, 0x0, offset, len,
> >                                 (u8 *)eeprom_buff + (I40E_NVM_SECTOR_SIZE * i),
> >                                 last, NULL);
> >
> >
> 
> 
> -- 
> Thanks,
> ~Nick Desaulniers
>