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

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Date:	Tue, 14 Jul 2015 18:29:24 -0500
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	linux-kernel@...r.kernel.org, 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 Mon, Jul 13, 2015 at 06:11:38PM +0300, Michael S. Tsirkin wrote:
> 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>

Sorry, I lost the original message somehow, so I can't reply to it.  I
applied this by hand to my for-linus branch for v4.2, thanks!


commit c9ddbac9c89110f77cb0fa07e634aaf1194899aa
Author: Michael S. Tsirkin <mst@...hat.com>
Date:   Tue Jul 14 18:27:46 2015 -0500

    PCI: Restore PCI_MSIX_FLAGS_BIRMASK definition
    
    09a2c73ddfc7 ("PCI: Remove unused PCI_MSIX_FLAGS_BIRMASK definition")
    removed PCI_MSIX_FLAGS_BIRMASK from an exported header because it was
    unused in the kernel.  But that breaks user programs that were using it
    (QEMU in particular).
    
    Restore the PCI_MSIX_FLAGS_BIRMASK definition.
    
    [bhelgaas: changelog]
    Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
    Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
    CC: stable@...r.kernel.org	# v3.13+

diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
index efe3443..413417f 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 */
--
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