linux-kernel - Re: [PATCH v7 1/4] PCI: Introduce pcim_alloc_irq

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Date:   Tue, 8 Jun 2021 22:23:38 +0800
From:   Dejin Zheng <zhengdejin5@...il.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        corbet@....net, jarkko.nikula@...ux.intel.com,
        mika.westerberg@...ux.intel.com, rric@...nel.org,
        bhelgaas@...gle.com, wsa@...nel.org, Sanket.Goswami@....com,
        linux-doc@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v7 1/4] PCI: Introduce pcim_alloc_irq_vectors()

On Mon, Jun 07, 2021 at 12:14:51PM -0500, Bjorn Helgaas wrote:
> On Mon, Jun 07, 2021 at 07:12:34PM +0300, Andy Shevchenko wrote:
> > On Mon, Jun 07, 2021 at 11:39:13PM +0800, Dejin Zheng wrote:
> > > Introduce pcim_alloc_irq_vectors(), a device-managed version of
> > > pci_alloc_irq_vectors(). Introducing this function can simplify
> > > the error handling path in many drivers.
> > > 
> > > And use pci_free_irq_vectors() to replace some code in pcim_release(),
> > > they are equivalent, and no functional change. It is more explicit
> > > that pcim_alloc_irq_vectors() is a device-managed function.
> > 
> > ...
> > 
> > > When CONFIG_PCI=n, there is no stub for pci_is_managed(), but
> > > pcim_alloc_irq_vectors() will use it, so add one like other similar stubs.
> > > Otherwise there can be build errors, as here by kernel test robot
> > > reported:
> > > include/linux/pci.h: In function 'pcim_alloc_irq_vectors':
> > > >> include/linux/pci.h:1847:7: error: implicit declaration of function 'pci_is_managed' [-Werror=implicit-function-declaration]
> > >     1847 |  if (!pci_is_managed(dev))
> > >          |       ^~~~~~~~~~~~~~
> > 
> > This is rather changelog related material. No need to pollute commit message
> > with this.
> > 
> > ...
> > 
> > > Reported-by: kernel test robot <lkp@...el.com>
> > 
> > It's new functionality. Why this tag is here?
> > Use comments (similar location than changelog) to give a credit if you wish.
> 
> Agreed, I'll tidy that up, so no need to repost for this.

Bjorn, Thank you very much, you are so nice!

BR,
Dejin