linux-kernel - Re: [PATCH v2 0/6] PCI: Remove hybrid-devres region requests

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Message-ID: <20250516182555.GA2914997@rocinante>
Date: Sat, 17 May 2025 03:25:55 +0900
From: Krzysztof Wilczyński <kw@...ux.com>
To: Philipp Stanner <phasta@...nel.org>
Cc: Jonathan Corbet <corbet@....net>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Mark Brown <broonie@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Zijun Hu <quic_zijuhu@...cinc.com>,
	Yang Yingliang <yangyingliang@...wei.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH v2 0/6] PCI: Remove hybrid-devres region requests

Hello,

[...]
> the great day has finally arrived, I managed to get rid of one of the
> big three remaining problems in the PCI devres API (the other two being
> MSI having hybrid-devres, too, and the good old pcim_iomap_tablle)!
> 
> It turned out that there aren't even that many users of the hybrid API,
> where pcim_enable_device() switches certain functions in pci.c into
> managed devres mode, which we want to remove.
> 
> The affected drivers can be found with:
> 
> grep -rlZ "pcim_enable_device" | xargs -0 grep -l "pci_request"
> 
> These were:
> 
> 	ASoC [1]
> 	alsa [2] 
> 	cardreader [3]
> 	cirrus [4]
> 	i2c [5]
> 	mmc [6]
> 	mtd [7]
> 	mxser [8]
> 	net [9]
> 	spi [10]
> 	vdpa [11]
> 	vmwgfx [12]
> 
> All of those have been merged and are queued up for the merge window.
> The only possible exception is vdpa, but it seems to be ramped up right
> now; vdpa, however, doesn't even use the hybrid behavior, so that patch
> is just for generic cleanup anyways.
> 
> With the users of the hybrid feature gone, the feature itself can
> finally be burned.
> 
> So I'm sending out this series now to probe whether it's judged to be
> good enough for the upcoming merge window. If we could take it, we would
> make it impossible that anyone adds new users of the hybrid thing.
> 
> If it's too late for the merge window, then that's what it is, of
> course.
> 
> In any case I'm glad we can get rid of most of that legacy stuff now.

Thank you for sending a v2!  Much appreciated.

I pulled tentatively to the for-ci/devres branch, to get some soak time
with 0-day bot and KernelCI, while we wait for reviews and such.

Thank you!

	Krzysztof