Re: [PATCH] scsi: fix the build warning

[Akinobu Mita]

2013/8/22 James Bottomley <jbottomley@xxxxxxxxxxxxx>:
> On Thu, 2013-08-22 at 21:42 +0900, Akinobu Mita wrote:
>> 2013/8/22 Martin K. Petersen <martin.petersen@xxxxxxxxxx>:
>> >>>>>> "Joe" == Joe Perches <joe@xxxxxxxxxxx> writes:
>> >
>> > Joe> I don't get this build warning in the first place and I think the
>> > Joe> scsi_debug file is quite old and probably doesn't need to be
>> > Joe> changed at all.
>> >
>> > guard isn't a boolean, it selects the checksum algorithm used.
>> >
>> > Also, I believe Akinobu's recent reorganization of this code in question
>> > fixed the warning.
>>
>> Unfortunately, this warning isn't fixed in linux-next, either.
>> Paul Bolle also sent a patch that fixes the same warning in a little
>> bit different way.
>
> Well, it is and it isn't.  Whether you see the warning seems to depend
> on how gcc was built.  My take is that an impossible default case just
> to keep some versions of gcc quiet is a bit pointless.

As Joe said in the other reply, scsi_debug_guard could be a negative
value (scsi_debug_guard > 1 is only prohibited).  So this warning
does not seem a false positive.
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