linux-kernel - Re: [Xen-devel] [PATCH] PCI: Mark expected switch fall-throughs

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Message-ID: <500ce9e7-9a0f-b632-1731-f15a5ba872fd@embeddedor.com>
Date:   Wed, 20 Mar 2019 14:41:35 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Andrew Cooper <andrew.cooper3@...rix.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kees Cook <keescook@...omium.org>,
        xen-devel@...ts.xenproject.org
Subject: Re: [Xen-devel] [PATCH] PCI: Mark expected switch fall-throughs



On 3/20/19 2:27 PM, Andrew Cooper wrote:
> On 20/03/2019 18:27, Gustavo A. R. Silva wrote:
>> diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c
>> index 6fa1627ce08d..445b51db75b0 100644
>> --- a/drivers/pci/proc.c
>> +++ b/drivers/pci/proc.c
>> @@ -222,6 +222,7 @@ static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
>>  		}
>>  		/* If arch decided it can't, fall through... */
>>  #endif /* HAVE_PCI_MMAP */
>> +		/* fall through */
> 
> Surely it would be better to transpose the #endif and its previous line,
> than to add a second fallthrough ?
> 

I agree.  The thing is that, currently, GCC is expecting to find the
fall-through "annotations" at the very bottom of the case statement,
as I mentioned it in the changelog text.

That's the reason why I decided to left in place the original comment.

Thanks
--
Gustavo