linux-kernel - Re: [PATCH 5/7] resource: Handle simple alignment inside __find_empty_resource

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Message-ID: <ZYWQYNlYynPRdecK@smile.fi.intel.com>
Date: Fri, 22 Dec 2023 15:34:24 +0200
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: linux-pci@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Igor Mammedov <imammedo@...hat.com>, Lukas Wunner <lukas@...ner.de>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/7] resource: Handle simple alignment inside
 __find_empty_resource_slot()

On Fri, Dec 22, 2023 at 02:28:59PM +0200, Ilpo Järvinen wrote:
> allocate_resource() accepts alignf callback to perform custom alignment

s/alignf callback/->alignf() callback/

?

> beyond constraint->align. If alignf is NULL, simple_align_resource() is
> used which only returns avail->start (no change).
> 
> Using avail->start directly is natural and can be done with a
> conditional in __find_empty_resource_slot() instead which avoids
> unnecessarily using callback. It makes the code inside
> __find_empty_resource_slot() more obvious and removes the need for the
> caller to provide constraint->alignf unnecessarily.
> 
> This is preparation for exporting find_empty_resource_slot().

Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

...

>  		if (avail.start >= tmp.start) {
>  			alloc.flags = avail.flags;
> -			alloc.start = constraint->alignf(constraint->alignf_data, &avail,
> -					size, constraint->align);
> +			if (alignf) {
> +				alloc.start = alignf(constraint->alignf_data,

> +						     &avail, size,
> +						     constraint->align);

Maybe one line? It used to be a longer line in the old code.

> +			} else {
> +				alloc.start = avail.start;
> +			}

-- 
With Best Regards,
Andy Shevchenko