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Message-ID: <Y6ILydYEWzJdzwBJ@smile.fi.intel.com>
Date: Tue, 20 Dec 2022 21:23:53 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: "Hawa, Hanna" <hhhawa@...zon.com>
Cc: wsa@...nel.org, jarkko.nikula@...ux.intel.com,
mika.westerberg@...ux.intel.com, jsd@...ihalf.com,
linus.walleij@...aro.org, ben-linux@...ff.org,
linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
dwmw@...zon.co.uk, benh@...zon.com, ronenk@...zon.com,
talel@...zon.com, jonnyc@...zon.com, hanochu@...zon.com,
farbere@...zon.com, itamark@...zon.com,
Lareine Khawaly <lareine@...zon.com>
Subject: Re: [PATCH v4 1/1] i2c: designware: use casting of u64 in clock
multiplication to avoid overflow
On Tue, Dec 20, 2022 at 07:43:06PM +0200, Hawa, Hanna wrote:
> On 12/20/2022 7:11 PM, Andy Shevchenko wrote:
> > On Tue, Dec 20, 2022 at 04:48:06PM +0000, Hanna Hawa wrote:
...
> > > - return DIV_ROUND_CLOSEST(ic_clk * tSYMBOL, MICRO) - 8 + offset;
> > > + return DIV_ROUND_CLOSEST_ULL((u64)ic_clk * tSYMBOL, MICRO) - 8 +
> > > + offset;
> >
> > Broken indentation.
...
> > > - return DIV_ROUND_CLOSEST(ic_clk * (tSYMBOL + tf), MICRO) - 3 + offset;
> > > + return DIV_ROUND_CLOSEST_ULL((u64)ic_clk * (tSYMBOL + tf),
> > > + MICRO) - 3 + offset;
> >
> > I would still go with 'MICRO) -' part to be on the previous line despite being
> > over 80, this is logical split which increases readability.
>
> Okay.. will move the 'MICRO) -' one line before
> >
> > > - return DIV_ROUND_CLOSEST(ic_clk * (tLOW + tf), MICRO) - 1 + offset;
> > > + return DIV_ROUND_CLOSEST_ULL((u64)ic_clk * (tLOW + tf), MICRO) - 1 +
> > > + offset;
> >
> > Broken indentation.
>
> Why it's broken indentation? I'm asking to know for the next time. The word
> 'offset' is not part of DIV_ROUND_CLOSEST_ULL parentheses. In wrong
> indentation the checkpatch shout about it, but it didn't happen with the
> above.
The continuation line of the expression should go under the opening
parentheses, but you are right, the part outside DIV_ should be under
D and not as you suggested below.
But the problem is that you made illogical split while I suggested to leave
DIV_...() on one line and the rest on the other.
> Does the below the correct indentation?
No.
return DIV_ROUND_CLOSEST_ULL((u64)ic_clk * tSYMBOL, MICRO) -
8 + offset;
return DIV_ROUND_CLOSEST_ULL((u64)ic_clk * (tSYMBOL + tf), MICRO) -
3 + offset;
return DIV_ROUND_CLOSEST_ULL((u64)ic_clk * (tLOW + tf), MICRO) -
1 + offset;
--
With Best Regards,
Andy Shevchenko
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