[dpdk-kmods,v2] linux/igb_uio: fix build for switch fall through
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Commit Message
Linux is using '-Wimplicit-fallthrough=5' compiler option, which doesn't
take any fall through comments into account but only uses compiler
'fallthrough' attribute to document fall through action is intended.
"falls through" comment was used in the code which is causing a build
error now, this patch converts comment to the 'fallthrough' macro
defined in the Linux.
To cover the case where an old Linux version doesn't have the macro,
defined it in the compatibility header too.
Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
---
Cc: Stephen Hemminger <stephen@networkplumber.org>
v2:
* Add both dummy and attribute fallthrough macro definition to
compatibility header.
---
linux/igb_uio/compat.h | 14 ++++++++++++++
linux/igb_uio/igb_uio.c | 6 +++---
2 files changed, 17 insertions(+), 3 deletions(-)
Comments
16/12/2021 13:03, Ferruh Yigit:
> Linux is using '-Wimplicit-fallthrough=5' compiler option, which doesn't
> take any fall through comments into account but only uses compiler
> 'fallthrough' attribute to document fall through action is intended.
>
> "falls through" comment was used in the code which is causing a build
> error now, this patch converts comment to the 'fallthrough' macro
> defined in the Linux.
>
> To cover the case where an old Linux version doesn't have the macro,
> defined it in the compatibility header too.
>
> Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
Applied, thanks.
@@ -152,3 +152,17 @@ static inline bool igbuio_kernel_is_locked_down(void)
return false;
#endif
}
+
+#ifndef fallthrough
+
+#ifndef __has_attribute
+#define __has_attribute(x) 0
+#endif
+
+#if __has_attribute(__fallthrough__)
+#define fallthrough __attribute__((__fallthrough__))
+#else
+#define fallthrough do {} while (0) /* fallthrough */
+#endif
+
+#endif
@@ -250,7 +250,7 @@ igbuio_pci_enable_interrupts(struct rte_uio_pci_dev *udev)
}
#endif
- /* falls through - to MSI */
+ fallthrough;
case RTE_INTR_MODE_MSI:
#ifndef HAVE_ALLOC_IRQ_VECTORS
if (pci_enable_msi(udev->pdev) == 0) {
@@ -269,7 +269,7 @@ igbuio_pci_enable_interrupts(struct rte_uio_pci_dev *udev)
break;
}
#endif
- /* falls through - to INTX */
+ fallthrough;
case RTE_INTR_MODE_LEGACY:
if (pci_intx_mask_supported(udev->pdev)) {
dev_dbg(&udev->pdev->dev, "using INTX");
@@ -279,7 +279,7 @@ igbuio_pci_enable_interrupts(struct rte_uio_pci_dev *udev)
break;
}
dev_notice(&udev->pdev->dev, "PCI INTX mask not supported\n");
- /* falls through - to no IRQ */
+ fallthrough;
case RTE_INTR_MODE_NONE:
udev->mode = RTE_INTR_MODE_NONE;
udev->info.irq = UIO_IRQ_NONE;