linux-kernel - Re: [PATCH] pci_regs: reintroduce PCI_MSIX_FLAGS

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Date:	Mon, 13 Jul 2015 18:11:38 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Rajat Jain <rajatxjain@...il.com>,
	"Chen, Gong" <gong.chen@...ux.intel.com>,
	Guenter Roeck <groeck@...iper.net>,
	=?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= 
	<zajec5@...il.com>, linux-api@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH] pci_regs: reintroduce PCI_MSIX_FLAGS_BIRMASK

On Wed, Jul 01, 2015 at 12:14:10PM +0200, Michael S. Tsirkin wrote:
> This partially reverts commit 09a2c73ddfc7f173237fc7209a65b34dd5bcb5ed.
>     PCI: Remove unused PCI_MSIX_FLAGS_BIRMASK definition
> 
> That commit dropped a symbol from an exported header claiming "no one
> uses it". This isn't how Linux normally approaches userspace API though,
> and in fact QEMU build fails if trying to use updated headers from linux
> 3.12 and up.
> 
> Sure, userspace can be fixed to use the new symbol, but the cost
> of keeping the old one around is fairly low, too.
> 
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>

Ping. Can this be included upstream please?

> ---
>  include/uapi/linux/pci_regs.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
> index efe3443..66644ac 100644
> --- a/include/uapi/linux/pci_regs.h
> +++ b/include/uapi/linux/pci_regs.h
> @@ -319,6 +319,7 @@
>  #define PCI_MSIX_PBA		8	/* Pending Bit Array offset */
>  #define  PCI_MSIX_PBA_BIR	0x00000007 /* BAR index */
>  #define  PCI_MSIX_PBA_OFFSET	0xfffffff8 /* Offset into specified BAR */
> +#define  PCI_MSIX_FLAGS_BIRMASK	PCI_MSIX_PBA_BIR /* deprecated */
>  #define PCI_CAP_MSIX_SIZEOF	12	/* size of MSIX registers */
>  
>  /* MSI-X Table entry format */
> -- 
> MST
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