linux-kernel - Re: [PATCH v1 02/13] iio: chemical: bme680: avoid using camel case

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Message-ID: <ZwrdYOZVVeDsi0gZ@surfacebook.localdomain>
Date: Sat, 12 Oct 2024 23:34:40 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Vasileios Aoiridis <vassilisamir@...il.com>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, jic23@...nel.org,
	lars@...afoo.de, robh@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, anshulusr@...il.com, gustavograzs@...il.com,
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 02/13] iio: chemical: bme680: avoid using camel case

Fri, Oct 11, 2024 at 08:50:27PM +0200, Vasileios Aoiridis kirjoitti:
> On Fri, Oct 11, 2024 at 01:00:33PM +0300, Andy Shevchenko wrote:
> > On Thu, Oct 10, 2024 at 11:00:19PM +0200, vamoirid wrote:

...

> > >  	var1 = ((1340 + (5 * (s64)calib->range_sw_err)) *
> > > -			((s64)lookupTable[gas_range])) >> 16;
> > > +			((s64)lookup_table[gas_range])) >> 16;
> > 
> > Also an opportunity to make this neater like
> > 
> > 	var1 = (1340 + (5 * (s64)calib->range_sw_err)) * (s64)lookup_table[gas_range]);
> > 	var1 >>= 16;
> > 
> > So, at bare minumym there are redundant parentheses. And looking at the table
> > and the first argument of multiplication I'm puzzled why casting is needed for
> > the second? Shouldn't s64 already be implied by the first one?
> 
> I think the 2nd cast indeed is not needed since the 1st one forces the
> s64 so I can remove it.

Thinking about this more, you don't need the first either,
if using 5LL instead of 5.

-- 
With Best Regards,
Andy Shevchenko