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


  • To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Bjorn Helgaas <bhelgaas@xxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
  • From: "Gustavo A. R. Silva" <gustavo@xxxxxxxxxxxxxx>
  • Date: Wed, 20 Mar 2019 14:41:35 -0500
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  • Cc: linux-pci@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Kees Cook <keescook@xxxxxxxxxxxx>
  • Delivery-date: Wed, 20 Mar 2019 19:41:48 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt


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

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