linux-kernel - Re: [PATCH RFC v2 12/29] PCI/MSI: Introduce pcim_enable

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Message-ID: <20131122184447.GB8981@mtj.dyndns.org>
Date:	Fri, 22 Nov 2013 13:44:47 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Alexander Gordeev <agordeev@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	Michael Ellerman <michael@...erman.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ben Hutchings <bhutchings@...arflare.com>,
	David Laight <David.Laight@...LAB.COM>,
	Mark Lord <kernel@...rt.ca>, "H. Peter Anvin" <hpa@...or.com>,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH RFC v2 12/29] PCI/MSI: Introduce pcim_enable_msi*()
 family helpers

On Fri, Nov 22, 2013 at 07:44:30PM +0100, Alexander Gordeev wrote:
> On Wed, Nov 20, 2013 at 12:15:26PM -0500, Tejun Heo wrote:
> > The use of @nvec and @maxvec is a bit inconsistent.  Maybe it'd be
> > better to make them uniform?
> 
> With @maxvec I tried to stress an implication there could be values
> less than @maxvec. While @nvec is more like an exact number.
> Perfectly makes sense to me, but this is personal :)

Oh yeah, I agree but saw a place where @nvec is used for max.  Maybe I
was confused.  Looking again...

+int pcim_enable_msi_range(struct pci_dev *dev, struct msix_entry *entries,
+                         unsigned int nvec, unsigned int minvec)
+
+This variation on pci_enable_msi_block() call allows a device driver to
+request any number of MSIs within specified range minvec to nvec. Whenever
+possible device drivers are encouraged to use this function rather than
+explicit request loop calling pci_enable_msi_block().

e.g. shouldn't that @nvec be @maxvec?

Thanks.

-- 
tejun
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