linux-kernel - Re: [PATCH v4] coding-style: Clarify the expectations around bool

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Date:   Mon, 14 Jan 2019 17:20:49 +0000
From:   Jason Gunthorpe <jgg@...lanox.com>
To:     Joey Pabalinas <joeypabalinas@...il.com>,
        Joe Perches <joe@...ches.com>,
        Gal Pressman <galpress@...zon.com>,
        Bart Van Assche <bvanassche@....org>,
        Stephen Warren <swarren@...dotorg.org>,
        Tariq Toukan <tariqt@...lanox.com>,
        "xavier.huwei@...wei.com" <xavier.huwei@...wei.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        Doug Ledford <dledford@...hat.com>,
        Stephen Warren <swarren@...dia.com>,
        Christoph Hellwig <hch@....de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] coding-style: Clarify the expectations around bool

On Fri, Jan 11, 2019 at 07:29:40AM -1000, Joey Pabalinas wrote:
> On Thu, Jan 10, 2019 at 11:48:13PM +0000, Jason Gunthorpe wrote:
> > There has been some confusion since checkpatch started warning about bool
> > use in structures, and people have been avoiding using it.
> > 
> > Many people feel there is still a legitimate place for bool in structures,
> > so provide some guidance on bool usage derived from the entire thread that
> > spawned the checkpatch warning.
> 
> Hey Jason,
> 
> I very much agree that the bool expectations could be much clearer, and this
> patch is a nice step in that direction! Just a couple small nitpicks:
> 
> > +Do not use bool if cache line layout or size of the value matters, its size
> > +and alignment varies based on the compiled architecture. Structures that are
> > +optimized for alignment and size should not use bool.
> 
> +Do not use bool if cache line layout or size of the value matters, as its size
>                                                                     ^
>                                                                     |
> Adding an "as" makes the sentence flow a bit cleaner: --------------
> 
> > +into a single bitwise 'flags' argument and 'flags' can often a more readable
> > +alternative if the call-sites have naked true/false constants.
> 
> +into a single bitwise 'flags' argument and 'flags' can often be a more readable
>                                                               ^
>                                                               |
> Missing a "be" here: -----------------------------------------
> 
> Ack from me after those two corrections.
> 
> Reviewed-by: Joey Pabalinas <joeypabalinas@...il.com>

done, thanks

Jason