linux-kernel - Re: [PATCH v2 1/5] acpi: Store the Physical Location of Device (

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Message-ID: <Ybnoy9e6VvFsJ4b1@kuha.fi.intel.com>
Date:   Wed, 15 Dec 2021 15:08:27 +0200
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Prashant Malani <pmalani@...omium.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        "open list:ULTRA-WIDEBAND (UWB) SUBSYSTEM:" 
        <linux-usb@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/5] acpi: Store the Physical Location of Device
 (_PLD) information

Hi Rafael,

On Wed, Dec 15, 2021 at 12:43:48PM +0100, Rafael J. Wysocki wrote:
> One overall problem I see here is that it potentially stores a bunch
> of _PLD buffers that will never be used, which is a waste of memory.
> 
> It may be better to make acpi_device_get_location() evaluate _PLD for
> the target device if it cannot be found in the list and either update
> one of the existing entries if the crc matches and return the pld data
> from there, or add a new item to the list and return its pld data.

The primary goal of this series is actually to see the other devices
that share a fixed location with our device. The _PLD buffer cache
would be nice, but not necessary. We don't have to store the _PLD
buffer itself as part of the location structure at all if that's a
problem.

I'll make the change.

thanks,

-- 
heikki