linux-kernel - [PATCH v2 2/2] vfio/cdx: update driver to build without CONFIG_GENERIC_MSI

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Message-ID: <20250821071308.1572106-2-nipun.gupta@amd.com>
Date: Thu, 21 Aug 2025 12:43:08 +0530
From: Nipun Gupta <nipun.gupta@....com>
To: <arnd@...db.de>, <gregkh@...uxfoundation.org>, <nikhil.agarwal@....com>
CC: <linux-kernel@...r.kernel.org>, <llvm@...ts.linux.dev>,
	<oe-kbuild-all@...ts.linux.dev>, <robin.murphy@....com>, <krzk@...nel.org>,
	<tglx@...utronix.de>, <maz@...nel.org>, <linux@...ssschuh.net>,
	<chenqiuji666@...il.com>, <peterz@...radead.org>, <robh@...nel.org>,
	<abhijit.gangurde@....com>, <nathan@...nel.org>, <nipun.gupta@....com>,
	kernel test robot <lkp@...el.com>
Subject: [PATCH v2 2/2] vfio/cdx: update driver to build without CONFIG_GENERIC_MSI_IRQ

Define dummy MSI related APIs in VFIO CDX driver to build the
driver without enabling CONFIG_GENERIC_MSI_IRQ flag.

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202508070308.opy5dIFX-lkp@intel.com/
Reviewed-by: Nikhil Agarwal <nikhil.agarwal@....com>
Signed-off-by: Nipun Gupta <nipun.gupta@....com>
---
Changes v1->v2:
- fix linking intr.c file in Makefile

 drivers/vfio/cdx/Makefile  |  6 +++++-
 drivers/vfio/cdx/private.h | 14 ++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/vfio/cdx/Makefile b/drivers/vfio/cdx/Makefile
index df92b320122a..dadbef2419ea 100644
--- a/drivers/vfio/cdx/Makefile
+++ b/drivers/vfio/cdx/Makefile
@@ -5,4 +5,8 @@
 
 obj-$(CONFIG_VFIO_CDX) += vfio-cdx.o
 
-vfio-cdx-objs := main.o intr.o
+vfio-cdx-objs := main.o
+
+ifdef CONFIG_GENERIC_MSI_IRQ
+vfio-cdx-objs += intr.o
+endif
diff --git a/drivers/vfio/cdx/private.h b/drivers/vfio/cdx/private.h
index dc56729b3114..0482a1516439 100644
--- a/drivers/vfio/cdx/private.h
+++ b/drivers/vfio/cdx/private.h
@@ -38,11 +38,25 @@ struct vfio_cdx_device {
 	u8			config_msi;
 };
 
+#ifdef CONFIG_GENERIC_MSI_IRQ
 int vfio_cdx_set_irqs_ioctl(struct vfio_cdx_device *vdev,
 			    u32 flags, unsigned int index,
 			    unsigned int start, unsigned int count,
 			    void *data);
 
 void vfio_cdx_irqs_cleanup(struct vfio_cdx_device *vdev);
+#else
+static int vfio_cdx_set_irqs_ioctl(struct vfio_cdx_device *vdev,
+				   u32 flags, unsigned int index,
+				   unsigned int start, unsigned int count,
+				   void *data)
+{
+	return 0;
+}
+
+static void vfio_cdx_irqs_cleanup(struct vfio_cdx_device *vdev)
+{
+}
+#endif
 
 #endif /* VFIO_CDX_PRIVATE_H */
-- 
2.34.1