Re: [PATCH RFC v2 12/29] PCI/MSI: Introduce pcim_enable_msi*() familyhelpers

From: Mark Lord
Date: Thu Oct 24 2013 - 22:23:39 EST

On 13-10-24 10:31 AM, Alexander Gordeev wrote:
> On Thu, Oct 24, 2013 at 11:51:58AM +0100, Tejun Heo wrote:
>> I haven't looked into any details but, if the above works for most use
>> cases, it looks really good to me.
> Well, if we reuse Michael's statistics:
> - 58 drivers call pci_enable_msix()
> - 24 try a single allocation and then fallback to MSI/LSI
> - 19 use the loop style allocation
> - 14 try an allocation, and if it fails retry once
> ...then I expect most of 19/58 (loop style) could be converted to
> pcim_enable_msix() and pcim_enable_msix_range() and all of 14/58
> (single fallback) should be converted to pcim_enable_msix() users.

Those are just the in-kernel drivers.
There are many, many more out-of-kernel drivers for embedded platforms,
hardware in-development, etc..

Let's not be overly presumptive about the size of the user base.

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