linux-kernel - Re: [PATCH] md: bitwise operations might not fit in a "bool"

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Message-ID: <20100722223740.7baa68a1@notabene>
Date:	Thu, 22 Jul 2010 22:37:40 +1000
From:	Neil Brown <neilb@...e.de>
To:	Boaz Harrosh <bharrosh@...asas.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Jiri Slaby <jirislaby@...il.com>,
	James Bottomley <James.Bottomley@...e.de>,
	linux-scsi@...r.kernel.org, hch@....de, jaxboe@...ionio.com,
	LKML <linux-kernel@...r.kernel.org>, linux-raid@...r.kernel.org
Subject: Re: [PATCH] md: bitwise operations might not fit in a "bool"

On Thu, 22 Jul 2010 15:20:53 +0300
Boaz Harrosh <bharrosh@...asas.com> wrote:

> On 07/22/2010 02:55 PM, Neil Brown wrote:
> > On Thu, 22 Jul 2010 14:44:53 +0300
> > Boaz Harrosh <bharrosh@...asas.com> wrote:
> > 
> >>
> >> when taking a resolute of a bit-wise AND as true false. Better / faster
> >> to make it a boolean operation.
> >>
> >> This fixes a bug and a crash because the flags field did not fit into
> >> the bool operands.
> > 
> > No, that won't work.
> > Read the rest of the code and see where 'do_sync' and 'do_barriers' are used.
> > 
> > NeilBrown
> > 
> 
> You are right! (I didn't look)
> 
> the use of "bool" was wrong from the get go. it was never a bool operation.
> What was the guy thinking? What is that do_XXX name? that name should change
> as well. Perhaps flg_sync, flg_barriers.

Check the git history - 'bool' was originally appropriate.  But when the
value was recently changed, the type and name were not.
I would actually prefer "sync_flg" and "barrier_flg", but your suggestion
that we change the name as well as the type is a good one.

Thanks,
NeilBrown
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