linux-kernel - Re: [PATCH 1/2, pci] pci: Addition of PCI_DEV_FLAGS_QUIET_PCI

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Date:   Wed, 14 Mar 2018 19:41:27 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     "Desnes A. Nunes do Rosario" <desnesn@...ux.vnet.ibm.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-pci@...r.kernel.org,
        "open list:LINUX FOR POWERPC PA SEMI PWRFICIENT" 
        <linuxppc-dev@...ts.ozlabs.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, ruscur@...sell.cc,
        aik@...abs.ru, david@...son.dropbear.id.au,
        fbarrat@...ux.vnet.ibm.com, brking@...ux.vnet.ibm.com
Subject: Re: [PATCH 1/2, pci] pci: Addition of PCI_DEV_FLAGS_QUIET_PCI_REALIGN
 attribute to the PCI subsystem

On Wed, Mar 14, 2018 at 6:34 PM, Desnes A. Nunes do Rosario
<desnesn@...ux.vnet.ibm.com> wrote:
> Add PCI_DEV_FLAGS_QUIET_PCI_REALIGN to pci_dev_flags and use it to
> silent PCI realignment messages if the flag is turned on by a driver.

It doesn't explain "Why?"
Why the driver needs that?

Another approach is to increase level of the message. Would it be
accepted by you (in case Bjorn agrees)?

> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -205,6 +205,8 @@ enum pci_dev_flags {
>         PCI_DEV_FLAGS_NO_FLR_RESET = (__force pci_dev_flags_t) (1 << 10),
>         /* Don't use Relaxed Ordering for TLPs directed at this device */
>         PCI_DEV_FLAGS_NO_RELAXED_ORDERING = (__force pci_dev_flags_t) (1 << 11),
> +       /* Silent PCI resource realignment messages */
> +       PCI_DEV_FLAGS_QUIET_PCI_REALIGN = (__force pci_dev_flags_t) (1 << 12),

I would rather name it _NO_PCI_REALIGN_MSG

>  };

-- 
With Best Regards,
Andy Shevchenko