linux-kernel - Re: [PATCH RESEND] drbd: avoid clang warning about pointless switch statement

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Date:   Thu, 4 Oct 2018 12:22:31 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Lars Ellenberg <lars.ellenberg@...bit.com>
Cc:     Philipp Reisner <philipp.reisner@...bit.com>,
        Jens Axboe <axboe@...nel.dk>, drbd-dev@...ts.linbit.com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH RESEND] drbd: avoid clang warning about pointless switch
 statement

On Thu, Oct 04, 2018 at 09:18:54PM +0200, Lars Ellenberg wrote:
> On Tue, Oct 02, 2018 at 10:14:48AM -0700, Nathan Chancellor wrote:
> > From: Arnd Bergmann <arnd@...db.de>
> > 
> > The drbd code causes warnings that we cannot easily disable when building with clang:
> > 
> > In file included from drivers/block/drbd/drbd_debugfs.c:10:
> > In file included from drivers/block/drbd/drbd_int.h:48:
> > In file included from include/linux/drbd_genl_api.h:53:
> > In file included from include/linux/genl_magic_struct.h:237:
> > include/linux/drbd_genl.h:300:1: warning: no case matching constant switch condition '0'
> > 
> > There is nothing wrong with the code, and adding 'default:' labels
> > in the right place is enough to let clang shut up about the warning.
> 
> Actually, I think I'd prefer a "case 0:" instead of the "default:",
> because that would assert that we don't use a 0 for op or field numbers.
> 
> As at least some people seem to care, I suggest we bundle up
> this and the other clang warning you just resent the patch for
> with whatever else we may come up with for the next merge window
> and send a pull request to Jens then.
> In case we forget, please send a friendly reminder.
> 
> Thanks,
> 
>     Lars
> 

Hi Lars,

I will go ahead and test that change shortly and send it over for
review.

Thanks for the quick reply!
Nathan