[PATCH] USBIP: Use fallthrough pseudo-keyword

[PATCH] USBIP: Use fallthrough pseudo-keyword

[Pairman Guo]

Hi maintainers,

There is a usage of ``/* FALLTHRU */`` in a switch statement in main()
that have long been untouched. This patch replaced it with the
better and proper pseudo-keyword ``fallthrough;``.

Please merge if it is the case. Thank you in advance.

Signed-off-by: Pairman Guo <pairmanxlr@gmail.com>
---
 tools/usb/usbip/src/usbip.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/usb/usbip/src/usbip.c b/tools/usb/usbip/src/usbip.c
index f7c7220d9..ddcafb5c7 100644
--- a/tools/usb/usbip/src/usbip.c
+++ b/tools/usb/usbip/src/usbip.c
@@ -165,7 +165,7 @@ int main(int argc, char *argv[])
 		case '?':
 			printf("usbip: invalid option\n");
 			/* Terminate after printing error */
-			/* FALLTHRU */
+			fallthrough;
 		default:
 			usbip_usage();
 			goto out;
-- 
2.43.1

Re: [PATCH] USBIP: Use fallthrough pseudo-keyword

[Greg KH]

On Thu, Feb 15, 2024 at 05:26:30PM +0800, Pairman Guo wrote:
> Hi maintainers,
> 
> There is a usage of ``/* FALLTHRU */`` in a switch statement in main()
> that have long been untouched. This patch replaced it with the
> better and proper pseudo-keyword ``fallthrough;``.
> 
> Please merge if it is the case. Thank you in advance.

This is not needed in a changelog text.

> Signed-off-by: Pairman Guo <pairmanxlr@gmail.com>
> ---
>  tools/usb/usbip/src/usbip.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/usb/usbip/src/usbip.c b/tools/usb/usbip/src/usbip.c
> index f7c7220d9..ddcafb5c7 100644
> --- a/tools/usb/usbip/src/usbip.c
> +++ b/tools/usb/usbip/src/usbip.c
> @@ -165,7 +165,7 @@ int main(int argc, char *argv[])
>  		case '?':
>  			printf("usbip: invalid option\n");
>  			/* Terminate after printing error */
> -			/* FALLTHRU */
> +			fallthrough;

Did you compile this?  This is userspace code, and as-such, I don't
think it has this keyword, does it?

thanks,

greg k-h

Re: Re: [PATCH] USBIP: Use fallthrough pseudo-keyword

[Pairman Guo]

On Thu, Feb 15, 2024 at 11:14:49 +0800, Greg KH wrote:
> This is not needed in a changelog text.

Thanks for telling. I'm new to lkml and still learning about the format.

> >  tools/usb/usbip/src/usbip.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/tools/usb/usbip/src/usbip.c b/tools/usb/usbip/src/usbip.c
> > index f7c7220d9..ddcafb5c7 100644
> > --- a/tools/usb/usbip/src/usbip.c
> > +++ b/tools/usb/usbip/src/usbip.c
> > @@ -165,7 +165,7 @@ int main(int argc, char *argv[])
> >  		case '?':
> >  			printf("usbip: invalid option\n");
> >  			/* Terminate after printing error */
> > -			/* FALLTHRU */
> > +			fallthrough;
> 
> Did you compile this?  This is userspace code, and as-such, I don't
> think it has this keyword, does it?

I'm sorry for my hurrying. I ran ``make tools/usb`` with no warning or error,
so I sent this patch. Now it turns out ``make tools/usb`` doesn't cover
tools/usb/usbip. I tried again with ``./autogen.sh && ./configure && make``
and it indeed failed. Since usbip.c doesn't have any reference to
include/linux/compiler.h, it cannot use ``fallthrough``. Thanks again for
pointing out this error.

Thanks,

Pairman