[dpdk-dev] [PATCH] igb_uio: fix build on Linux 5.3 for implicit fall through

[Thomas Monjalon]

29/07/2019 14:32, Ferruh Yigit:
> build error:
> .../dpdk/build/build/kernel/linux/igb_uio/igb_uio.c:
>    In function ‘igbuio_pci_enable_interrupts’:
>    .../dpdk/build/build/kernel/linux/igb_uio/igb_uio.c:230:6:
>    error: this statement may fall through
>    [-Werror=implicit-fallthrough=]
>   230 |   if (pci_alloc_irq_vectors(udev->pdev, 1, 1, ....
> .../dpdk/build/build/kernel/linux/igb_uio/igb_uio.c:240:2:
>    note: here
>   240 |  case RTE_INTR_MODE_MSI:
>       |  ^~~~
> 
> The build error is caused by Linux kernel commit in 5.3 that enables the
> "-Wimplicit-fallthrough=3" gcc flag.
> Commit a035d552a93b ("Makefile: Globally enable fall-through warning")
> 
> To fix the error, either a gcc attribute can be provided [1] or a code
> comment with some defined syntax need to be provided [2], since there is
> already comments, updated them slightly to match the required syntax to
> fix the build error.
> 
> [1]
> "__attribute__ ((fallthrough));"
> 
> [2]
> [ \t.!]*([Ee]lse,? |[Ii]ntentional(ly)? )?
> fall(s | |-)?thr(ough|u)[ \t.!]*(-[^\n\r]*)?
> 
> Cc: stable at dpdk.org
> 
> Signed-off-by: Ferruh Yigit <ferruh.yigit at intel.com>

Applied, thanks