linux-kernel - Re: [RFC 1/1] swiotlb: Reduce calls to swiotlb_find

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Date: Fri, 28 Jun 2024 08:01:29 +0200
From: "hch@....de" <hch@....de>
To: Michael Kelley <mhklinux@...look.com>
Cc: "hch@....de" <hch@....de>,
	Petr Tesařík <petr@...arici.cz>,
	"robin.murphy@....com" <robin.murphy@....com>,
	"joro@...tes.org" <joro@...tes.org>,
	"will@...nel.org" <will@...nel.org>,
	"jgross@...e.com" <jgross@...e.com>,
	"sstabellini@...nel.org" <sstabellini@...nel.org>,
	"oleksandr_tyshchenko@...m.com" <oleksandr_tyshchenko@...m.com>,
	"m.szyprowski@...sung.com" <m.szyprowski@...sung.com>,
	"iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>
Subject: Re: [RFC 1/1] swiotlb: Reduce calls to swiotlb_find_pool()

On Thu, Jun 27, 2024 at 04:02:59PM +0000, Michael Kelley wrote:
> > > Conceptually, it's still being used as a boolean function based on
> > > whether the return value is NULL.  Renaming it to swiotlb_get_pool()
> > > more accurately describes the return value, but obscures the
> > > intent of determining if it is a swiotlb buffer.  I'll think about it.
> > > Suggestions are welcome.
> > 
> > Just keep is_swiotlb_buffer as a trivial inline helper that returns
> > bool.
> 
> I don't understand what you are suggesting.  Could you elaborate a bit?
> is_swiotlb_buffer() can't be trivial when CONFIG_SWIOTLB_DYNAMIC
> is set.

Call the main function that finds and retuns the pool swiotlb_find_pool,
and then have a is_swiotlb_buffer wrapper that just returns bool.