linux-kernel - Re: [PATCH] xen: mark expected switch fall-through

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Message-ID: <20190212235041.GA4463@localhost.localdomain>
Date:   Tue, 12 Feb 2019 18:50:41 -0500
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] xen: mark expected switch fall-through

On Tue, Feb 12, 2019 at 02:37:20PM -0600, Gustavo A. R. Silva wrote:
> In preparation to enabling -Wimplicit-fallthrough, mark switch
> cases where we are expecting to fall through.
> 
> This patch fixes the following warning:
> 
> drivers/xen/xen-pciback/xenbus.c: In function ‘xen_pcibk_frontend_changed’:
> drivers/xen/xen-pciback/xenbus.c:545:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    if (xenbus_dev_is_online(xdev))
>       ^
> drivers/xen/xen-pciback/xenbus.c:548:2: note: here
>   case XenbusStateUnknown:
>   ^~~~
> 
> Warning level 3 was used: -Wimplicit-fallthrough=3
> 
> Notice that, in this particular case, the code comment is modified
> in accordance with what GCC is expecting to find.
> 
> This patch is part of the ongoing efforts to enable
> -Wimplicit-fallthrough.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

Applied to for-linus-5.0

(xen-scsiback patch too)

-boris