linux-kernel - Re: [PATCH v4] pinctrl: intel: refine ->irq_set

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 15 Jun 2023 17:09:07 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     "Jadav, Raag" <raag.jadav@...el.com>
Cc:     "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "mika.westerberg@...ux.intel.com" <mika.westerberg@...ux.intel.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Sangannavar, Mallikarjunappa" 
        <mallikarjunappa.sangannavar@...el.com>,
        "N, Pandith" <pandith.n@...el.com>
Subject: Re: [PATCH v4] pinctrl: intel: refine ->irq_set_type() hook

On Thu, Jun 15, 2023 at 01:35:19PM +0000, Jadav, Raag wrote:
> > On Thu, Jun 15, 2023 at 06:20:22PM +0530, Raag Jadav wrote:
> > > Refine ->irq_set_type() hook and improve its readability by:
> > >
> > > - Reducing scope of spinlock by moving unneeded operations out of it.
> > > - Dropping redundant PADCFG0_RXEVCFG_SHIFT and including it directly
> > >   into PADCFG0_RXEVCFG_* definitions.
> > > - Utilizing temporary variables for common operations.
> > > - Simplifying if-else-if chain.
> > 
> > Two questions out of curiosity.
> > Do we gain or lose bytes with this?
> 
> add/remove: 0/0 grow/shrink: 1/0 up/down: 33/0 (33)
> Function                                     old     new   delta
> intel_gpio_irq_type                          317     350     +33
> Total: Before=10469, After=10502, chg +0.32%
> 
> > > +	value = readl(reg);
> > 
> > > +	value = (value & ~PADCFG0_RXINV) | rxinv;
> > > +	value = (value & ~PADCFG0_RXEVCFG_MASK) | rxevcfg;
> > 
> > Same question if we change this to be similar to the current code, i.e.
> > 
> > 	value = readl(reg);
> > 
> > 	value &= ~(PADCFG0_RXEVCFG_MASK | PADCFG0_RXINV);
> > 	value |= rxevcfg;
> > 	value |= rxinv;
> > 
> > And I would keep blank lines after readl() and before writel() since we have
> > more than a single line in between.
> 
> add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-9 (-9)
> Function                                     old     new   delta
> intel_gpio_irq_type                          317     308      -9
> Total: Before=10469, After=10460, chg -0.09%

Do I understand correctly that this is your patch + suggested above?

-- 
With Best Regards,
Andy Shevchenko