linux-kernel - Re: [PATCH v1 1/1] ACPI: Switch to use list_entry_is

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Message-ID: <Yh+kiSMZPleBcOXh@smile.fi.intel.com>
Date:   Wed, 2 Mar 2022 19:08:25 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Hui Wang <hui.wang@...onical.com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        nvdimm@...ts.linux.dev, Len Brown <lenb@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Ira Weiny <ira.weiny@...el.com>
Subject: Re: [PATCH v1 1/1] ACPI: Switch to use list_entry_is_head() helper

On Wed, Mar 02, 2022 at 05:36:20PM +0100, Rafael J. Wysocki wrote:
> On Wed, Mar 2, 2022 at 4:50 PM Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com> wrote:
> > On Fri, Feb 11, 2022 at 01:04:23PM +0200, Andy Shevchenko wrote:
> > > Since we got list_entry_is_head() helper in the generic header,
> > > we may switch the ACPI modules to use it. This eliminates the
> > > need in additional variable. In some cases it reduces critical
> > > sections as well.
> >
> > Besides the work required in a couple of cases (LKP) there is an
> > ongoing discussion about list loops (and this particular API).
> >
> > Rafael, what do you think is the best course of action here?
> 
> I think the current approach is to do the opposite of what this patch
> is attempting to do: avoid using the list iterator outside of the
> loop.

OK, let's drop this change.

-- 
With Best Regards,
Andy Shevchenko