linux-kernel - Re: [PATCH] virt: vbox: Mark expected switch fall-through

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Date:   Tue, 26 Feb 2019 20:32:34 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Hans de Goede <hdegoede@...hat.com>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] virt: vbox: Mark expected switch fall-through



On 2/26/19 3:04 PM, Hans de Goede wrote:
> Hi,
> 
> On 26-02-19 20:23, 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/virt/vboxguest/vboxguest_core.c: In function ‘vbg_core_ioctl’:
>> drivers/virt/vboxguest/vboxguest_core.c:1486:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
>>     f32bit = true;
>>     ~~~~~~~^~~~~~
>> drivers/virt/vboxguest/vboxguest_core.c:1489:2: note: here
>>    case VBG_IOCTL_HGCM_CALL(0):
>>    ^~~~
>>
>> 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>
> 
> Thank you the patch, patch looks good to me:
> 
> Reviewed-by: Hans de Goede <hdegoede@...hat.com>
> 

Thank you, Hans.

--
Gustavo


> Regards,
> 
> Hans
> 
> 
> 
>> ---
>>   drivers/virt/vboxguest/vboxguest_core.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/virt/vboxguest/vboxguest_core.c b/drivers/virt/vboxguest/vboxguest_core.c
>> index 1475ed5ffcde..df7d09409efe 100644
>> --- a/drivers/virt/vboxguest/vboxguest_core.c
>> +++ b/drivers/virt/vboxguest/vboxguest_core.c
>> @@ -1484,8 +1484,8 @@ int vbg_core_ioctl(struct vbg_session *session, unsigned int req, void *data)
>>   #ifdef CONFIG_COMPAT
>>       case VBG_IOCTL_HGCM_CALL_32(0):
>>           f32bit = true;
>> -        /* Fall through */
>>   #endif
>> +        /* Fall through */
>>       case VBG_IOCTL_HGCM_CALL(0):
>>           return vbg_ioctl_hgcm_call(gdev, session, f32bit, data);
>>       case VBG_IOCTL_LOG(0):
>>